An Investigation of Alternatives to Mercury Containing Products

January 22, 2003

Prepared for The Maine Department of Environmental Protection

by Catherine Galligan Gregory Morose Jim Giordani

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Table of Contents

EXECUTIVE SUMMARY...... 5

1.0 INTRODUCTION...... 7

2.0 MERCURY NOTIFICATION DATA REVIEW...... 8

3.0 MERCURY PRODUCT PRIORITIZATION ...... 10

4.0 FINDINGS...... 15

4.1 Costs of Using Mercury ...... 16

4.2 Sphygmomanometers ...... 18

4.3 Esophageal Dilators (Bougies) and Gastrointestinal Tubes...... 21

4.4 Manometers ...... 23

4.5 Thermometers (non-fever) ...... 24

4.6 Barometers ...... 27

4.7 Psychrometers/Hygrometers ...... 28

4.8 Hydrometers ...... 28

4.9 Flow meters ...... 29

4.10 Pyrometers...... 30

4.11 Thermostats (industrial and manufacturing) ...... 31

4.12 Float Switches...... 31

4.13 Tilt Switches...... 40

4.14 Pressure Switches...... 46

4.15 Temperature Switches...... 50

4.16 Relays ...... 54 4.16.A Mercury Displacement Relay...... 56 4.16.B Mercury Wetted Reed Relay...... 57 4.16.C Mercury Contact Relay...... 59

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4.17 Flame Sensor...... 64

5.0 CONCLUSIONS AND RECOMMENDATIONS ...... 66

5.1 Conclusions...... 66

5.2 Recommendations ...... 70

6.0 SOURCES...... 72

Appendix 1: Medical Device Reports for Spilled Mercury...... 75

Appendix 2: Cost of Mercury Spills...... 76

Appendix 3: Transition to Non-mercury Products...... 77

Appendix 4: Maine DEP Letter to Manufacturers of Mercury-added Products ...... 81

Appendix 5: Aneroid Sphygmomanometers ...... 83

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The LCSP study included a review of the Executive Summary mercury product notification data submitted by manufacturers to IMERC. The notification data

included a description of mercury added The Maine Department of Environmental components, number of components, amount of Protection (DEP) will issue a report on January 1, mercury per unit, amount of mercury in total 2003 that will include a comprehensive strategy domestic sales, and purpose of mercury in the to reduce the mercury content of products. To product. At the time of the review, this included assist in gathering information for this report, the seventy-six manufacturers reporting 390 mercury Maine DEP commissioned the Lowell Center for containing products. The LCSP study also Sustainable Production of the University of included discussions with mercury product Massachusetts Lowell to conduct a study of experts, discussions with manufacturers of alternatives to mercury containing products. mercury products, review of responses to a May Mercury’s chemical and physical properties 1, 2002 State of Maine letter to mercury product have been applied to meet the requirements of manufacturers (see Appendix 4), review of thousands of products and applications including: published mercury product studies, and review of dental amalgams, scientific instruments, pertinent data available on the internet. electrical components, batteries, lamps, and Since there are thousands of products that medical devices. These mercury containing contain mercury, a prioritization effort was products are widely used in residential, needed to focus on a core set of products that commercial, industrial, military, marine, and could then undergo further detailed study. The medical environments. criteria for this prioritization included: amount of Mercury from these products can be released mercury released to the environment, amount of to the environment during various stages of the mercury contained within the product, total product life cycle including production, amount of mercury reported for all product sales, transportation, manufacturing, use, and disposal. product coverage by current regulation, and the Once released, the mercury can transform to availability of non-mercury alternatives. organic forms, and can readily disperse in the Products and components were reviewed as part environment through the air, soil, and water. of the prioritization process. Components are Mercury is persistent in the environment, and typically sold to original equipment also accumulates in concentration as it manufacturers to be incorporated within a biomagnifies within the food chain. Mercury is product. For example, the mercury tilt switch is highly toxic to humans; exposure can damage a component that is incorporated in automobiles, kidneys and the central nervous system. The fetus vending machines, cranes, wheelchairs, and is particularly sensitive to mercury’s toxic numerous other products. effects. Mercury also has adverse effects on The priority products selected for further wildlife including early death, weight loss, and detailed study included sphygmomanometers, reproductive issues. gastrointestinal tubes, manometers, non-fever In February 2002, the Interstate Mercury thermometers, barometers, hygrometers, Education and Reduction Clearinghouse psychrometers, hydrometers, flow meters, (IMERC) was formed under the auspices of the pyrometers, and thermostats (industrial and Northeast Waste Management Officials’ manufacturing only). The priority components Association (NEWMOA). IMERC is an selected for further detailed study included float umbrella organization designed to assist the eight switches, tilt switches, pressure switches, northeast states in their implementation of temperature switches, displacement relays, mercury reduction laws and programs aimed at wetted reed relays, mercury contact relays, and getting mercury out of consumer products, the flame sensors. waste stream, and the environment. After the priority products and components were selected, detailed research and analysis was

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then conducted. The findings from this research same desired functionality, such as providing an include: accurate measure of blood pressure or sensing a flame, there are often design considerations or · Description of how the mercury different techniques or practices that must be first product/component operates learned and communicated. · Typical applications of the mercury product/component · Non-mercury alternatives available · Cost range for the mercury product/component and non-mercury alternatives · Advantages and disadvantages of the mercury products/components and their non-mercury alternatives · Manufacturer information for non- mercury alternatives · Summary of findings for each mercury product/component

In general, cost competitive non-mercury alternatives were identified that meet the functionality requirements for most priority mercury products. Therefore, these products could be targets for mercury reduction efforts. The two products where alternative replacements cannot be recommended are the gastrointestinal tubes and the industrial thermostats. For the following components there are cost competitive non-mercury alternatives available for new products and applications: flame sensors, float switches, tilt switches, temperature switches, and pressure switches. However, non- mercury relays can cover most, but not all, combinations of design parameters for new relay products or applications. Certain retrofit situations for mercury switches and relays exist where the non-mercury alternative is not cost competitive. Efforts to reduce the sale of mercury switches and relays for retrofitting existing products or applications should take this into consideration. There are many opportunities for substituting non-mercury alternatives for mercury containing products and components. Many alternatives are not simple drop-in substitutions. Although a non- mercury alternative may ultimately achieve the

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1.0 Introduction · Identify non-mercury alternatives to the products identified.

The Maine Department of Environmental · Conduct a qualitative evaluation of viable Protection (DEP) will issue a report on January 1, alternatives, including their cost and 2003 that is required under An Act to Phase Out performance. the Availability of Mercury Added Products, PL 2001, c. 620. The report will include a summary The research methodology undertaken to of mercury product data and a comprehensive complete this study included: strategy to reduce the mercury content of the products. · Telephone communication and meetings To assist in gathering information for this with Northeast Waste Management report, the Maine DEP commissioned the Lowell Officials’ Association (NEWMOA) and Center for Sustainable Production (LCSP) to Maine DEP personnel were conducted to conduct a study of alternatives to mercury understand the information received on containing products. This report summarizes the mercury-containing products. findings of the LCSP investigation. · An internet search was conducted to The LCSP develops, studies and promotes obtain data and understand the flow of environmentally sound systems of production, mercury associated with products. This healthy work environments, and economically data provided a reference against which viable work organizations. The LCSP is based at the NEWMOA and DEP mercury the University of Massachusetts Lowell, where it product submissions could be compared. works closely with the Massachusetts Toxics Use Reduction Institute (TURI) and the Department · Telephone interviews of mercury of Work Environment. reduction experts were held to gain Because of its persistent, bioaccumulative and insight on their perspectives and to toxic nature, the management of mercury reinforce or challenge conclusions drawn presents a hazard to the environment that should by the researchers. be addressed and minimized wherever feasible. · An internet search and phone interviews Reducing mercury exposure can be accomplished were conducted to identify the function by source reduction, by minimizing uses that of mercury in products and to identify disperse the material into the environment, and alternatives for mercury containing by diverting and reclaiming any mercury components and products. containing products prior to disposal. While regulations on use and waste diversion strategies · Telephone interviews were conducted are necessary, an effective and economically with manufacturers to develop efficient strategy would be, wherever possible, to information on the alternatives, their substitute mercury containing products with applications, and their advantages and products containing less hazardous materials. disadvantages. · Interviews were held with users of The objective of this study is to accomplish medical products to understand what the following: made a product preferable from the user’s perspective. · Investigate mercury product information in the public domain. · A search and review of literature in the public domain was conducted to provide · Identify priority products for investigating data on mercury products and non-mercury alternatives. components and their performance.

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Total Mercury in all Mercury Added 2.0 Mercury Notification Data Products Form: This form requests manufacturer contact information, as well Review as total amount of mercury in all units sold in the United States for a particular product. The Maine statutes (see 38 MRSA § 1661-A) prohibit the sale of mercury-added products Approximately 700 letters in December 2001 unless the manufacturer has provided written and 1,100 letters in June 2002 were sent to notification disclosing the amount and purpose of manufacturers to request such information for the mercury. New Hampshire, Rhode Island, and mercury containing products. IMERC has Connecticut have passed similar mercury reviewed the received mercury notification forms notification laws. for adherence to the requested information. The In February 2002, the Interstate Mercury majority of notification forms received require Education and Reduction Clearinghouse follow-up communications with the manufacturer (IMERC) was formed. IMERC is an umbrella to address missing or erroneous data. Once the organization designed to assist the eight review of the notification forms has been finished Northeast states in their implementation of and has been considered complete, the mercury reduction laws and programs aimed at information is entered into an IMERC electronic getting mercury out of consumer products, the database. waste stream, and the environment. For this study, the mercury notification Launched under the auspices of the Northeast information in the IMERC electronic database Waste Management Officials’ Association was reviewed in June and July of 2002. At that (NEWMOA), IMERC has coordinated regional time, the database contained notification mercury reduction efforts and assisted state information for seventy-six manufacturers environmental agencies in developing and reporting 390 mercury containing products. The implementing specific legislation and programs total amount of mercury for all units sold in the for manufacturer notification, labeling, United States was available for ninety-eight of collection, and eventual phase-out of products these products. Substantially more mercury data that contain mercury. has been provided to IMERC since the LCSP IMERC has consolidated the mercury completed its review. notification information obtained by the individual states prior to February 2002, and has The following table illustrates the served as the clearinghouse for all mercury distribution of IMERC data for the various notification information received since that time product types: for Maine, New Hampshire, Rhode Island, and Connecticut. IMERC has used two notification forms to collect this data: Table 2.1: IMERC Data

Mercury Added Product Notification Form: Product Number of The term “mercury added” is used to Products indicate that the mercury was intentionally Reported added to the product. This form requests Barometer 1 manufacturer contact information, as well Battery 16 as information pertaining to the mercury in the product such as description of mercury Gas plasma display 7 added components, number of components, Lamp 16 amount of mercury, and purpose of mercury Lamp – cold cathode 1 in the product. Lamp – fluorescent 32

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Product Number of Products Reported Lamp – HID 36 Lamp – LCD 115 Lamp – mercury 18 xenon Lamp – ultraviolet 1 Manometer 7 Relays 2 Sensor – flame 52 Sphygmomanometer 3 Switch – float 15 Switch – pressure 2 Switch - temperature 1 Switch - tilt 36 Thermometer 9 Thermostat 20 Total: 390 Source: NEWMOA Database, July 2002

The IMERC mercury product data were one of several important sources of data for this report. IMERC information was valuable for the prioritization process discussed in section 3, and for identifying the initial manufacturers to be contacted for further information. Other sources of mercury product information included discussions with mercury product manufacturers and experts, review of mercury product reports, and review of relevant data available on the internet.

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properties have been applied by design engineers 3.0 Mercury Product to meet the needs of thousands of diverse products and applications. The following table Prioritization illustrates examples of products that employ some of these properties. A broad search was conducted to determine the scope of products that contain mercury. The Table 3.1: Properties of Mercury intent of this search was not to develop a comprehensive list of products, but rather to Product Example Property of Mercury develop background information on: Mercury wetted reed Electrical relays conductivity · How is mercury being used in Position sensing Liquid at ambient products? products such as conditions level sensors · Why is mercury being used in Barometer Precise movement in products? response to air pressure differential · How much mercury is in various Thermometer Precise products? expansion/contraction in response to · What are common mercury temperature change components for various products? Dental amalgam Easily alloys with many metals such as · Are non-mercury alternatives gold, silver, and tin. available for these mercury containing Gastrointestinal tubes Density products? Fluorescent lights When energized, mercury in vapor These questions were investigated through form emits ultraviolet discussions with mercury product experts, energy discussions with manufacturers of mercury Tilt switches utilize Combination of products, review of IMERC mercury notification both the electrical properties results, review of responses to a May 1, 2002 conductivity and State of Maine letter to mercury product liquid at ambient manufacturers (see Appendix 4), review of conditions properties published mercury product studies, and review of pertinent data available on the internet. Since there are thousands of products that This review has shown that for most mercury- contain mercury, the research effort focused on added products, the mercury is found in a number identifying a core set of priority products or of common components. For example, tilt common components that could then undergo switches are a common component in hundreds further detailed study. For the purpose of this of products and applications such as building report, the terms product and component will be security systems, automobile trunk lights, defined as followed: scanners, and robotics. This is also true for batteries, relays, and fluorescent lamps which are Product: A product is predominately sold to each used in hundreds of products and the consumer in its final product state. For applications. example, a thermometer is sold to the The universe of products that use mercury is consumer for temperature measuring extensive. Mercury’s chemical and physical purposes.

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The higher the amount of mercury Component: A component is predominately sold contained within a product, the more to an original equipment manufacturer to be likely it would be a priority for further incorporated within another product. For research. Various sources were used to example, the tilt switch is sold to automobile obtain this information including: manufacturers to be incorporated into an discussions with manufacturers of automobile. mercury products, review of IMERC mercury notification results, review of The following five criteria were selected as published mercury product studies, and the basis for this prioritization: review of pertinent data available on the internet. 1. What is the contribution of the product category to the total mercury released to 3. What is the total amount of mercury the environment for all product reported for all sales of a specific type of categories? product in the U.S.?

Only limited data is available on mercury The higher the total amount of mercury released on an individual product basis. reported for all U.S. product sales, the More information is available on mercury more likely it would be a priority for released by product category. Thus, total further research. The primary source for mercury released by product category was this data was a review of IMERC mercury chosen as a screening criterion. The more notification results. However, this mercury released by a product category, information was reported and available the more likely that products in that for only a few product types at the time of category would be a priority for further this study. Also, since all manufacturers research. had not yet reported at that time, the value of the highest product sales amount The following report was selected as a reported from a single manufacturer for a basis to support this criterion: “Substance particular product was used in Table 3.3. Flow Analysis of Mercury in Products” prepared by Barr Engineering Company 4. Is the product addressed by existing for the Minnesota Pollution Control mercury regulations? Agency on August 15, 2001. (Barr, 2001) This report was chosen because it Mercury-added products already provided a comprehensive review of total regulated by either the State of Maine or mercury releases from numerous product federal Environmental Protection Agency categories, it included mercury releases to (EPA) were eliminated as a priority for each environmental media (land, air, and further study as part of this report. The water), and it was recently published. Maine statutes on mercury-added The releases by product category from products, 38 MRSA §1661 et seq., as well this report have been categorized as high as pertinent EPA regulations were used as for releases greater than 20% of total sources for this information. releases, medium for releases from 5% to 20% of total releases, and low for releases 5. Have readily available non-mercury less than 5% of total releases. alternatives been identified?

2. What is the amount of mercury within the If non-mercury alternatives are available product? in the marketplace, then the product is more likely to be a priority for further

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study. The data sources for this effort · Wetted reed relays included discussions with mercury · Mercury contact relays product experts, discussions with · Flame sensors manufacturers of mercury products, review of published mercury product The results of applying these five criteria are studies, and review of pertinent data summarized on the following page in Table 3.3 available on the internet. Priority Product Selection. The shaded cells indicate the priority products selected. Certain mercury products did not fall into a LCSP notes that the Maine DEP has prepared product category. For many of these products a summary of IMERC data as of December 2002. very limited information was available about This more recent review of the IMERC data their current use, manufacture, and mercury supports the priorities identified by LCSP based content. This included counterweights, jewelry, on the amount of mercury in the products and the and advanced mercury alloys used in products total amount of mercury in domestic product such as convertors, oscilloscopes, sales. semiconductors, solar cells, satellites, and infrared sensors. These products were therefore not considered a priority for this project. As a result of applying these five criteria to mercury containing products, the following products and components were selected for further study as part of this report:

Table 3.2: Priority Products and Components

Products · Sphygmomanometers · GI tubes · Manometers · Thermometers (non-fever) · Barometers · Hygrometers · Psychrometers · Hydrometers · Flow meters · Pyrometers · Thermostats (industrial and manufacturing)

Components · Float switches · Tilt switches · Pressure switches · Temperature switches · Displacement/plunger relays

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Table 3.3: Priority Product Selection

Product Product Mercury Total Addressed Alternatives Priority Category Content Mercury Use in Existing Identified Releases1 (mg)2 By Single Legislation4 Manufacturer (g)3 Sphygmo - > 1,000 1,815,000 No Yes Yes manometers Manometers > 1,000 6,956 No Yes Yes GI Tubes > 1,000 Not Available No Yes Yes Flame sensors > 1,000 1,267,000 No Yes Yes Thermometers (non- Other > 1,000 765,443 No Yes Yes fever) measurement & Barometers, control devices > 1,000 Not Available No Yes Yes hygrometer, (High) psychrometer, hydrometer, flow meter, pyrometer Permeter, barostat, Not Not Available No No No oscillator, gyroscope, Available otoscope, sequential multiple analyser, phanotron, ignitron Amalgam Dental > 1,000 Tytin Alloy: Yes Yes No (High) 8,811,270 Fever Thermometers Fever 100 – 1,000 Not Available Yes Yes No Thermometers (Medium) Fluorescent Lamps Fluorescent Predom- 2,092 No No No Lamps inately (Medium) < 100 Float switch > 1,000 1,914,418 No Yes Yes Tilt switch 100 to 1,000 11,329 No Yes Yes > 1,000 Pressure Switch > 1,000 Not Available No Yes Yes Temperature Switch > 1,000 Not Available No Yes Yes Displacement/plunger Other Relays & 10 to 50, 50 16,174,300 No Yes Yes relay Switches to 100 (Medium) 100 to 1,000 > 1,000 Wetted reed relay 10 to 50, 50 2,400 No Yes Yes to 100 100 to 1,000 > 1,000 Other mercury 0 to 5, 5 to Not Available No Yes Yes contact relays 10 10 to 50 100 to 1,000 > 1,000 Manufacturing and Thermostats 100 – 1,000 2,162 No Yes Yes industrial thermostats (Medium) > 1,000 HID & Other Lamps HID & Other Predom- 16,051 No No No Lamps inately (Low) < 100

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Product Product Mercury Total Addressed Alternatives Priority Category Content Mercury Use in Existing Identified Releases1 (mg)2 By Single Legislation4 Manufacturer (g)3 Batteries Batteries Predom- 50,085 No No No (Low) inately < 100 Bulk Liquid Mercury Bulk Liquid Not Not Available Yes No No Mercury applicable (Low) Chlor-alkali products Chlor-alkali Misc- Not Available No Yes No products ellaneous (Low) ppm/ppb Pharmaceuticals Pharmaceuticals Misc. Not Available No No No (Low) ppm/ppb Latex Paint Latex Paint Misc. Not Available Yes Yes No (Low) ppm/ppb Fungicides Fungicides Misc. Not Available No Yes No (Low) ppm/ppb Film Film 0 - 5 164 No No No Convertor, Advanced Not Not Available No No No oscilloscope, Materials available semiconductors, solar (HgCdTe, HgTe, cells, satellites, HgSe) infrared sensors Cleaners, detergents, Chemical Misc- Not Available No No No catalysts, reagents, Compounds ellaneous pigments, cosmetics, ppm/ppb other industrial/laboratory use Jewelry, Miscellaneous Not Not Available No No No counterweights available 1 Source: “Substance Flow Analysis of Mercury in Products” Prepared for the Minnesota Pollution Control Agency, August 15, 2001. Film, advanced materials, chemical compounds, and miscellaneous were not explicit product categories within this report. High: greater than 20% of total releases, Medium: 5% to 20% of total releases, Low: less than 5% of total releases. 2 From IMERC database, IMERC paper files, and other miscellaneous sources. 3 Total amount of mercury used in all products sold in calendar year 2001 as reported to IMERC. The value in the table indicates the highest amount reported from a single manufacturer for a particular product. Total amounts have not yet been reported by all manufacturers. 4 The Maine statutes restricting the sale and use of mercury-added products, 38 MRSA §1661 et seq., as well as pertinent EPA regulations were used as sources.

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Manufacturers This section lists in table format the 4.0 Findings manufacturers of mercury containing products/components and manufacturers of the Once the prioritization process was completed non-mercury alternatives. This table also and accepted by the Maine Department of provides product/component name, manufacturer Environmental Protection, the analysis of the phone number, and manufacturer website priority products and components was initiated. information. After conducting research and analysis of the priority products and components, the findings Format were prepared. The findings of this study are There are two formats used in this report to here presented in the following format: present findings. The priority products are covered in sections 4.2 through 4.11 utilizing the Description following format: This section includes an overview of how the product/component operates, background Description information on the product/component, and typical applications of the product/component. Alternatives

Alternatives Costs This section identifies the non-mercury product/component available to replace the Advantages/Disadvantages function and performance characteristics of the mercury containing product/component. Manufacturers

Costs Summary The costs in this section are often provided in a range. The range includes only list prices available on the internet or by manufacturer The priority components are covered in sections inquiry as part of this study. The range does not 4.12 through 4.17 utilizing a slightly different necessarily include every model or every format. Since the components are used in a wide manufacturer listed for a particular technology. variety of products and applications, the The prices for a specific model may vary description, costs, advantages/disadvantages, and considerably based upon options required, manufacturers information will be provided for quantity ordered, customer discount, and other each non-mercury alternative identified. Also, factors. The price ranges are only presented to the manufacturers of both mercury and non- provide a gross cost comparison between the mercury manufacturers are provided. The various technologies. following is the format for priority components:

Advantages/Disadvantages Description This section compares the effectiveness of the non-mercury alternative product/components to Costs the mercury containing products or components. The function of the mercury containing Advantages/Disadvantages product/components will be considered, and the merits and shortcomings of the alternatives will Manufacturers be presented. Summary

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thermometers and sphygmomanometers that 4.1 Costs of Using Mercury could be avoided by using alternative non- mercury products. For sphygmomanometers, Traditionally the cost of using mercury has Kaiser found that “the aneroid alternative is been focused on the purchase price of the device. significantly more expensive to purchase on a What is often not recognized are the other costs unit basis. When associated lifecycle costs are that go along with the use of mercury. These included … total costs per unit drop to about 1/3 other costs include potential for costly spills, the total costs of the mercury unit.” The findings adverse health effects, liability, regulatory of the LCSP study indicate that in 2002, the compliance costs and maintaining equipment and purchase cost of mercury and aneroid trained personnel to handle mercury releases. sphygmomanometers are now comparable. This Tellus Institute’s report “Healthy Hospitals: further reduces the lifecycle costs for the non- Environmental Improvements Through Better mercury sphygmomanometers. Environmental Accounting” proposes that Kaiser’s mercury minimization efforts environmental costs and benefit information can reduced costs avoidance by reducing the be incorporated into accounting practices to incidence of spills, exposure incidents and attain a more meaningful cost. It considers liability, and staff toxics training, as detailed in environmental costs, which are defined as the Table 4.2. Kaiser’s estimates suggest that for “impacts, both monetary and non-monetary, every $1 spent on spill response, there is incurred by a firm or organization resulting from potentially another $1.75 for training, fines, and activities affecting environmental quality. These treatment of exposure. (Tellus Institute, 2000) costs include conventional costs, potentially Although clean up costs are not well hidden costs, and less tangible costs.” (Tellus documented in the literature, an internet search Institute, 2000) revealed numerous reports that provide insight into the financial impact of a mercury spill. A Table 4.1: Mercury Costs summary of these reports is presented in Appendix 2. Potentially Hidden Less Tangible Costs While the LCSP study does not present the Costs full life cycle costs for each of the mercury and · Up-front: site · Liability: non-mercury products, the costs delineated in this preparation, Superfund, section should be considered when evaluating permitting, personal injury, these products. installation property damage · Back-end: site · Future regulatory closure, compliance costs disposal of · Employee safety inventory, post- and health closure care compensation · Regulatory: · Organizational training, image monitoring, recordkeeping Source: Tellus Institute, 2001

The same report provides a case study of Kaiser Permanente’s mercury minimization efforts. Kaiser Permanente is the largest not-for- profit Health Maintenance Organization (HMO) in the United States. Kaiser considered the costs in addition to the purchase price of mercury

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Table 4.2 : Kaiser Permanente Case Study

Avoided Cost Sources of cost avoidance Category and estimate Amount Spill preparation The cost of a mercury spill kit is and response known, as is the cost of a spill response by Kaiser Permanente’s $20,000/year contractor. These costs, combined with the average historical number of spill incidents from broken devices in a year, permit an avoided cost estimate to be made. Compliance and Use of mercury-containing liability devices necessitates staff spill/exposure training. $15,000/year Further, given staff training, careful use and appropriate spill procedures, the presence of mercury-containing devices gives rise to the possibility of fines from facility inspections or spill incidents. The probabilistic costs of mercury related penalties were estimated using representative statutory and regulatory penalties multiplied by the probability of a fine being assessed for any particular violation. Treatment of A probabilistic cost. Even exposure assuming very high standards of appropriate and careful use, some small number of mercury exposures from broken devices are likely when mercury- containing devices are employed throughout the Kaiser system. Cost is determined from the expected yearly cost of long- term treatment of a single pediatric exposure case ($100,000-plus), and the probability of an exposure incident within a given year. Additional soft “Soft cost” savings were not savings estimated, but could, include: (environmental environmental contamination staff were aware from mercury release, of these costs, but subsequent health impact, and they were not negative media attention. quantified) Source: Tellus Institute, 2000

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4.2 Sphygmomanometers Korotkoff sounds, or sounds that characterize different stages of blood flow during cuff Description deflation. At certain points in the sound pattern, Blood pressure is generated by the activity of the the clinician reads the pressure using a column of heart and blood vessel system and is widely mercury or the dial of an aneroid (mechanical) accepted as a measure of cardiovascular gauge. This technology is the most widely used performance. Therefore blood pressure levels and because of its low cost and simplicity. variations are considered to be a valid indicator The familiar mercury sphygmomanometer of cardiovascular function and overall health. uses a column of mercury (manometer) to Most blood pressure devices use an air filled provide the pressure readout. Mercury’s liquid cuff to temporarily block blood flow through the state and its precise expansion and contraction in artery, then apply a particular technique to obtain response to pressure are very suitable for blood pressure data while the cuff deflates. The pressure indication. The manometer reads from 0 two most common techniques for pressure to 300 mmHg. measurement are the auscultatory method A common aneroid gauge consists of a dial (listening for characteristic blood flow sounds) or that reads in units of 0 to 300 mmHg and a thin oscillometric technique (using a pressure brass corrugated bellows inside. There is a shaft transducer). which connects two pins at right angles to each The two main considerations for this other; one of these rests on the bellows, the other discussion of blood pressure devices are 1) how is inside a concave sided triangle which meshes the blood pressure is sensed (e.g. by ear or by with a pinion connected to the dial pointer. A thin using a pressure transducer) and 2) the gauge or coiled spring (known as a hair spring) is also indicator for the pressure value (mercury column, connected to the pinion and returns the pointer to dial gauge, or microprocessor/digital display). A zero when the pressure is released. The gauge is mercury column is the traditional method of connected to a blood pressure cuff around the indicating blood pressure. patient's arm. As the pressure in the cuff rises, the pin resting on the expanding bellows is lifted. Alternatives This movement is transmitted by the other pin In the field, two alternatives to mercury are which moves the triangle and therefore the pinion widely marketed for clinical blood pressure and pointer. (Yeats, 1993) measurement. They are aneroid (mechanical dial) Welch Allyn has recently introduced the Dura sphygmomanometers and low-end professional Shock aneroid sphygmomanometer that utilizes a electronic blood pressure monitors. There are new internal design. The new concept results in a other non-mercury blood pressure monitors sphygmomanometer that is lighter in weight, available as well, including home monitors, considerably lower in cost, and more shock ambulatory blood pressure monitors, and high- resistant than a conventional aneroid end vital signs monitors. These are not covered in sphygmomanometer. Further research is this report because they are generally not warranted to understand the internal design. considered direct replacements for mercury sphygmomanometers. Oscillometric Blood Pressure Monitors

Auscultatory Sphygmomanometers (mercury and The oscillometric blood pressure monitor uses aneroid) a pressure sensor and a microprocessor in place of the ear and simple gage. During cuff deflation, Mercury and aneroid sphygmomanometers a pressure sensor transmits an electric signal rely on the auscultatory technique, in which a representing the distention of the artery. Within clinician determines systolic and diastolic blood the microprocessor, this signal is translated to pressures (SBP and DBP) by listening for systolic and diastolic blood pressure (SBP and

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DBP) using empirically derived algorithms. Table 4.3 Cost of Comparable Mercury and Manufacturers spend considerable effort Aneroid Sphygmomanometers validating their algorithms for accuracy. In addition to SBP and DBP, this type of Manufacturer Type List or Model & Style Suggested device can display more comprehensive 1 information about blood pressure patterns, which price Welch Allyn Mercury $132 5097-26 can be useful for diagnostics. Because of its Wall unit Aneroid $134 5091-38 higher cost and technical sophistication, this type Welch Allyn Mercury $258 5097-29 of device is not as prevalent as the auscultatory Mobile unit Aneroid $253 5091-41 devices. The cost of these devices has dropped Welch Allyn Mercury Not available2 significantly over the past few years and 3 companies are now marketing these to hospitals Pocket unit DuraShock $59 DS45- aneroid 11 based on the breadth of information they can (portable) Aneroid $162 5098-02 provide. ADC Mercury $111 952B Electronic equipment using the oscillometric Wall Unit Aneroid $105 750W technique is common in two types of equipment: ADC Mercury $204 972 1. A mid-price blood pressure monitor, designed Mobile Unit Aneroid $204 750M to compete with auscultatory devices. In the Trimline Mercury $299 0103N past few years several companies have begun Mobile Unit Aneroid $264 4103N Trimline Mercury $120 0303N promoting this type of device and as their Wall Model Aneroid $137 4303N cost has decreased, use is becoming more Trimline Mercury $148 0403N widespread. Desk Model Aneroid $151 4203N 2. Vital signs monitors – This class of device is Trimline Mercury Not 2 often found in hospital settings where available Hand-held Aneroid $98 2273N simultaneous monitoring of multiple vital 1 signs (e.g. temperature, blood pressure, heart These prices were obtained by contacting each manufacturer and/or their websites and requesting rate, blood oxygen level) is desirable or pricing on comparable mercury and aneroid units. critical for patient outcomes. The 2 No comparable unit because Hg column must be instrument’s electronic box includes multiple rigidly mounted in perfectly vertical position; incompatible with hand-held or portable units. modules, each for measuring a different sign. 3 They are available from several device The DuraShock is a new product for Welch Allyn that is more resilient than a traditional aneroid. This manufacturers. These devices, though design also results in a significantly lower cost. relatively common in hospitals, are not considered further because they are not Oscillometric blood pressure monitors are considered a one-for-one replacement for a considerably higher in price, as shown in the mercury sphygmomanometer. following table.

Cost Most manufacturers of auscultatory devices offer both mercury and aneroid sphygmomanometers. A sampling of prices for mercury and aneroid devices revealed essentially no difference between the two, as shown in the following table.

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information may allow doctors to better Table 4.4 Cost of Oscillometric Blood Pressure understand and manage a patient’s condition. Monitors Mercury gauges are familiar, have a long history of use, are on the low end of the cost Manufactur List or Model spectrum and they have the unique advantage of er & Style Suggested being perceived as the gold standard for blood price pressure. The primary disadvantages of the Pulse Metric $995 DynaPulse Pathway mercury gauge are associated with the toxicity of VSM $645 BP Tru mercury. Mishandling may result in a mercury MedTech spill and there is potential for a costly mercury Ltd. cleanup. Even with proper handling and Welch Allyn $805 Spot Vital maintenance, mercury gauges eventually require Medical Signs™ Products either handling of elemental mercury during maintenance or disposal of mercury as a Advantages/Disadvantages hazardous waste. For the clinician, mercury From the perspective of clinicians and hospital gauges require positioning one’s head at the systems, the considerations for blood pressure proper, but often awkward, angle to read the devices include cost, accuracy, ease of use, glass tube’s mercury meniscus. maintenance and calibration, and environmental Aneroid gauges are familiar, have a long impact. One needs to consider the merits and history of use, are on the low end of the cost shortcomings of the following two aspects of spectrum, are easy to read, and the clinician can blood pressure devices: easily perform a rudimentary function check by observing the zero resting point and the 1. The method of pressure sensing; i.e. smoothness of dial rotation. Mishandling may auscultatory (listening to sounds) versus result in damage to the gauge. Aneroid gauges oscillometric (using pressure transducers). have been maligned in the press recently, and 2. The pressure readout mechanism; i.e. there is an unsubstantiated perception that mercury manometer, aneroid gauge, or accuracy of aneroid gauges is inferior to mercury microprocessor with digital display. columns. The calibration is different from, but comparable in complexity, to proper calibration Auscultatory devices (mercury and aneroid) of the mercury devices. rely on the human ear to detect and distinguish The electronic monitors on the oscillometric sounds and there is a possibility for measurement devices are easy to use and provide an easy-to- error due to individual skill and levels of auditory read digital display of the DBP and SBP. The acuity and sensitivity. Auscultatory devices allow devices go through a self-calibration routine on measurement of just SBP and DBP. In contrast, start up. In addition to SBP and DBP, many of the oscillometric monitors are less dependent on the devices display comprehensive data that operator technique and many offer a greater provides greater insight into patient health; as the breadth of baseline data including mean arterial devices are used more widely it is likely that the pulse (MAP) and pulse rate. Some monitors also full utility of features will be better recognized allow addition of modules for other vital signs and reported. Some disadvantages of the (temperature, pulse oximetry), pulse waveforms, electronic blood pressure monitors are initial cost and data analysis. One manufacturer’s technical and the need for A/C power or a battery pack. representative reported that he continues to learn about the utility of the oscillometric device as doctors phone in and describe how they are using the data for diagnostics. In short, the breadth of

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successfully converted to non-mercury Manufacturers sphygmomanometers. Since 1993, Mayo Clinic The following are manufacturers of alternative replaced approximately 1,500 mercury sphygmomanometers: sphygmomanometers with wall-mounted aneroid devices. At the same time a maintenance protocol Mercury and Aneroid Sphygmomanometers was developed to ensure proper function and Manufacturer Product Phone Number & accuracy of these devices. In March 2001, Mayo Name Website published the results of an internal study in which American ADC 613-273-9600 Diagnostic Sphygmo - www.adctoday.co they concluded that the aneroid Corporation manometer m sphygmomanometers provide accurate pressure Trimline Trimline 800-526-3538 measurements when properly maintained. Medical Sphygmo - www.trimlinemed. (Canzanello et al, 2001) Appendix 5, Aneroid Products manometer com Sphygmomanometers, includes further discussion and addresses some commonly held perceptions W.A. Baum Baum 631-226-3940 Co. Inc. Aneroid www.wabaum.com about the use of aneroid sphygmomanometers. Sphygmoma nometer Welch Allyn WelchAllyn 315-685-4100 Medical Tycos www.welchallyn.c Products sphygmo - om 4.3 Esophageal Dilators (Bougies) manometer and Gastrointestinal Tubes Oscillometric Blood Pressure Monitors Manufacturer Product Phone Number & Esophageal Dilators (Bougies) Website Pulse Metric DynaPulse 866-3962-78573 Description Pathway www.pulsemetric.c An esophageal dilator, also called a bougie, is a om long, weighted flexible tube that is passed down VSM BpTRU™ 913-307-9527 a patient’s esophagus to dilate a narrowed area. MedTech Ltd. www.vsmmedtech. In the past, mercury was commonly used in the com bougie. Its density and liquid state made mercury Welch Allyn Spot Vital 800-535-6663 ideal as a flexible weight that assisted passing the Medical Signs™ www.welchallyn.c Products om tube down the throat into the esophagus, Vital Signs conforming to the shape of the esophagus and Products exerting the pressure needed to enlarge the narrowed section. The mercury-filled devices Summary have a thick latex outer coating that contains Research on sphygmomanometers suggests that about two pounds of mercury. Esophageal there are numerous good alternatives to mercury dilators may be found in thoracic surgery, sphygmomanometers. Aneroid sphygmo- otolaryngology, and the medical procedure units. manometers are cost competitive, have a long history in the field, and have been found Alternatives acceptable by many hospitals. Blood pressure The alternatives to mercury bougies use a monitors are more costly, but are becoming more tungsten gel to provide the flexible weight. popular as costs are dropping and medical Because tungsten is a solid at room temperature, practitioners are seeing advantages to their ease the tungsten within the device is a powder of use and the breadth of information provided. suspended in a gel. This allows the dilator to flex The Mayo Medical Center in Rochester, and conform to the shape of the esophagus, have Minnesota is an example of a facility that has a “feel” similar to the density of mercury, and to

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apply the proper pressure to enlarge the narrow Manufacturer Product Phone Number area of the esophagus. & Website Medovations, Weightright™ 800-558-6408 Inc Bougie www.medovatio Cost ns.com Mercury bougies are no longer widely available. Pilling Bougie Tubes 800-523-6507 Of the three manufacturers that were identified, (Maloney style www.pillingsurg only one company still offers mercury bougies at and Hurst ical.com a cost of $3,395 for a full set. The cost of a set of style bougies are weighted replacement tungsten gel bougies listed in the with tungsten range of $3,000 to $4,400. At the $4,400 end of gel) the range, one manufacturer was offering 10% Rusch Bougie Tubes 800-524-7722 discounts and a free mercury bougie take-back (Maloney style www.myrusch.c option. and Hurst om style bougies are tungsten Advantages/Disadvantages filled) Bougies have an expiration date, due to the potential for degradation of the outer rubber Summary casing. At the end of its useful life, a mercury Phone interviews with manufacturers and bougie must be disposed of as a hazardous medical practitioners suggest that tungsten filled material. Mercury containing esophageal dilators bougies are widely available and well received as have been known to rupture during handling or alternatives to mercury containing bougies. For use causing potential environmental, patient, and example, a seasoned practitioner in a hospital in employee hazards. The FDA Medical Device the northwest suburbs of Boston who was Report (MDR) system includes reports of interviewed recalled her hospital’s much earlier bougies rupturing and leaving mercury inside the use of mercury bougies. Her recollection was that patient as well as in the room. Examples of the hospital had been using tungsten filled MDRs for ruptured bougies are included in bougies for years and the non-mercury devices Appendix 1. performed just fine. The tungsten bougie is considered to be a safer, more environmentally benign alternative. The tungsten gel filled bougies perform like Gastrointestinal Tubes mercury filled bougies, so there are no changes in technique required. At the end of its useful life, a Description tungsten filled bougie can be disposed of in the Another family of tubes, including Miller Abbott, trash. Tungsten bougies have either a silicone Blakemore, and Cantor tubes, are used for covering or a PVC covering. An advantage of the addressing intestinal obstructions. Historically silicone surface is that it is non-slip when dry and these tubes used mercury as a flexible weight to slippery when wet, making handling easier. Some guide the tube into place through gravity. healthcare facilities are moving away from PVC This family of products represents a data gap because of a concern that when PVC is in this report. Research suggested that these incinerated as waste, there is potential for the devices are no longer widely used and no formation of dioxins during incineration. manufacturers of mercury-containing devices

were identified. Unweighted tubes are available, Manufacturers and although the manufacturers do not supply The following are manufacturers of non-mercury mercury they believe some customers add their and mercury esophageal dilators: own mercury.

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Alternatives Dartmouth Hitchcock Medical Center Two manufacturers were identified that described reported that in 1995 they eliminated the use of their products as viable alternatives for this type mercury in Miller Abbott Tubes by replacing the of application. Andersen offered unweighted and mercury with water and a contrast media. When tungsten weighted tubes that they described as the change was implemented, there was a alternatives for Miller-Abbott and Cantor tubes. concern that because water is not as heavy as Rusch’s Product Manager suggested that mercury, the procedure might take longer than practitioners can add sterile water to the Cantor with mercury. However the Safety and tube, as a weight to help move the tube. Environmental Programs office did not receive complaints from clinicians about the Cost replacement. It was reported that the nursing and A cost comparison is not relevant since mercury housekeeping staff were pleased with the products were not located. However, the cost of elimination of mercury because they were the non-mercury Miller Abbott and Cantor tubes responsible for mercury spills. were approximately $300 to $400.

Advantages/Disadvantages One manufacturer reported that sterile water can 4.4 Manometers be used as a weight for the cantor tube, in the place of mercury. The disadvantage is that the Description tube passes much more slowly, a disadvantage Manometers are used to measure air, gas, and that translates to a longer medical procedure water pressure. The mercury in manometers time. responds to air pressure in a precise way that can be calibrated on a scale. Manometers are used in Manufacturers laboratories, the dairy industry milking process, The following are manufacturers of gastro- and for calibrating outboard motors and intestinal tubes for which the buyer must provide motorcycle carburetors. Manometers are also the weighted liquid: used by HVAC contractors for testing, balancing, and servicing equipment. Manufacturer Product Phone Number & Website Alternatives Andersen Miller Abbott 800-523-1276 The three alternatives to a mercury manometer & Cantor include the needle/bourdon gauge, the aneroid Tubes manometer, and the digital manometer. The needle/bourdon gauge operates under a vacuum Rusch Cantor Tubes 800-524-7722 www.myrusch. with a needle indicator as a method to measure com pressure. The aneroid manometer operates in a similar fashion to the needle/bourdon gauge. The digital manometer uses a digital computer Summary programmed memory and gauges to measure the Research on gastrointestinal tubes suggests that pressure. this family of products is no longer widely used in hospitals. It is unclear whether mercury is still Cost used in settings where gastrointestinal tubes have Many digital manometers are manufactured for not become obsolete and if so, whether an various purposes and most pressure-sensing units alternative practice or product might be can be used interchangeably for different acceptable. applications. Digital manometers can range in price from $100 to $700 depending on the

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application it is being used for. Needle/bourdon Wisconsin dairy farms. (Wisconsin Department gauges range from $50 to $200 depending on the of Natural Resources, 2002) A similar program application and manufacturer. in Maine has resulted in the replacement of twenty-five mercury manometers from dairy barn Advantages/Disadvantages milking machines. (Maine DEP) Digital manometers, mercury manometers, and needle/bourdon gauges require calibration. This calibration ensures the accuracy of the instrument reading. A digital manometer can be more 4.5 Thermometers (non-fever) precise than the mercury manometer if properly calibrated. Basal Thermometers

Manufacturers Background The following are manufacturers of non-mercury An individual’s basal body metabolism is manometers. reflected in basal metabolic temperature, or the lowest normal body temperature of a person Manufacturer Product Phone Number & immediately on waking in the morning. Day-to- Name Website Mannix Digital 516-887-7979 day variations in basal temperature are indicative manometer www.mannix- of the body’s cyclical changes. For example, inst.com basal temperature is a useful index for evaluating ovulation. Testo Digital 973-252-1720/1- This baseline temperature is measured with a manometer 800-227-0729 www.testo.com basal thermometer, which is more sensitive than Extech Digital 781-890-7440 a conventional fever thermometer. The smallest Instruments manometer www.extech.com division on a basal thermometers is 0.1 degree, compared with 0.2 degree on a conventional Carbtune Aneroid 011 44 28 9023 fever thermometer. manometer 9007 www.carbtune.com Mercury basal thermometers are similar in Alnor Digital 1-800-424-7427 function to mercury fever thermometers. A manometer www.alnor.com column of mercury within a glass tube expands Dwyer Digital 219-879-8000 with increasing temperature and registers a Instruments manometer, www.dwyerinstru reading at the peak temperature. Needle/ ments.com bourdon gauge Alternatives Alternatives to basal thermometers are galinstan- Summary in-glass (liquid in a glass tube) and compact It appears that the alternatives to a mercury digital thermometers. manometer are cost competitive, reliable, and Galinstan basal thermometers are sold under widely manufactured and used throughout the the brand name Geratherm. Like mercury United States. An example of a successful thermometers, the Geratherm thermometer mercury manometer replacement project is the consists of silvery liquid in a glass tube. The effort undertaken for dairy farms in Wisconsin liquid is a mixture of gallium, indium, and tin with a $40,000 grant from the EPA. Dairy that expands with temperature to provide a equipment service providers participated in this reading. These are similar to Geratherm fever program by collecting the mercury manometers thermometers. used on dairy farms and replacing them with non- Battery-powered digital basal thermometers mercury manometers. Under this program, more are the most common option for basal than 100 manometers have been removed from

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thermometers. These are similar in appearance digitals are easily accepted: the time for taking a and function to digital fever thermometers. temperature is approximately 1 minute (vs. ~4 minutes for mercury), the thermometer provides Cost beeps to signal when peak temperature is Basal thermometers are fairly inexpensive and reached, and there is a memory chip that recalls technologies are readily available for under $15. the last reading. The main drawback of a digital The cost of devices is historically lowest for thermometer is that it uses a battery, which mercury basal thermometers, mid-range for requires proper recycling/disposal at the end of Geratherm, and highest for digital devices. its useful life. The digital basal thermometers are A data gap exists for the cost of mercury basal also more expensive than either mercury devices thermometers as our research was unable to or Geratherm thermometers. easily identify a current manufacturer. Becton Dickenson, a large medical manufacturer, Manufacturers reported that they no longer offer mercury basal The following are manufacturers of basal thermometers. Pharmacies in the researchers’ thermometers: local area have also eliminated mercury basal thermometers, although anecdotal information Manufacturer Product Phone Number & suggests that mercury basal thermometers are Website still available in other geographic locations. Becton Digital basal 201-847-6800 Dickinson thermometer http://www.bd.com According to one manufacturer, their list price Mabis Digital basal 800-728-6811 for the Geratherm basal thermometer is $7.69- Healthcare thermometer http://www.mabis. $7.99. Another manufacturer reported that the net average list price for its digital basal thermometer Omron Digital basal 800-231-3434 is $12. Healthcare, thermometer http://www.omronh Inc. ealthcare.com R.G. Medical Geratherm 888-596-9498 Advantages/Disadvantages Diagnostics basal http://www.rgmd.c The primary selling points for mercury are cost (U.S. thermometer om and familiarity. The disadvantages of mercury Distributor) (Galinstan basal thermometers are: lengthy dwell time to liquid -in-glass peak temperature (3-5 minutes), shake down is thermometer) required between readings, difficulty reading the column of mercury, fragile glass structure, and Summary Based on discussions with manufacturers and mercury basal thermometers may not be widely available. visits to local pharmacies, it appears that suitable The Geratherm liquid-in-glass thermometer is alternatives are readily available for mercury basal thermometers. comparable in function to mercury. That is, it consists of a glass tube containing a silvery liquid that rises in a column with increasing temperature. The Geratherm is lower in cost than Other Thermometers (non-fever) digital thermometers. Galinstan thermometers Description have several disadvantages: the toxicity of the gallium-indium-tin mixture is not well researched Non-fever thermometers are used for various industrial, laboratory, and commercial or understood, the silvery liquid may be mistaken for mercury, the fragile glass structure can break applications including food preparation, freezers, easily, and the Geratherm is slightly larger than a laboratory refrigerators, and testing. The protocol for certain lab requirements and food mercury basal thermometer. Digital basal thermometers appear to be the preparation codes require that the thermometers be of a high quality. most commonly available alternative to mercury devices. There are a number of reasons that the

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Alternatives annually. Re-calibration is required due to the The colored-liquid in glass thermometer (also gradual relaxation of residual mechanical strains called “liquid thermometer”) is the most common in the glass that can affect the volume of the replacement to the mercury thermometer. Its bulb. appearance and structure are similar to mercury A disadvantage of all liquid thermometers is in glass; it consists of a cylindrical tube the possibility of column separation. When a containing a liquid that expands and contracts separated column occurs, the thermometer cannot with increasing and decreasing temperature. The be used until the column is rejoined and liquids used in such glass thermometers include recalibrated. common organic liquids such as alcohol, Evidence provided by manufacturers indicates kerosene, and citrus extract based solvents that that most alternatives to mercury thermometers are dyed blue, red or green. Some manufacturers are as effective and reliable as the mercury offer liquid thermometers described as non-toxic thermometer with regular calibration. The most or environmentally friendly. Digital, bi-metal or common barrier to change is the widespread use infrared thermometers are also alternatives to of mercury thermometers as the “standard” for all mercury thermometers and are used in many of temperature sensing devices. the same applications. Manufacturers Cost The following are manufacturers of alternatives The costs of a thermometer can vary based upon to mercury thermometers. the requirements of a particular application. The following table illustrates these cost Manufacturer Product Phone Number differences. Name & Website ICL Liquid filled, www.icllabs.com Calibration Digital Table 4.5: Thermometer Costs Laboratories thermometer

Application Thermometer Cost Ertco (ever Liquid filled, 1-800-453-7826 Type ready Digital www.ertco.com Food Mercury $10 - $40 thermometers) thermometer Preparation Bi-metal $13 - $138 Digital $14 - $20 Comark Liquid filled, 1-800-555-6658 Liquid filled $2 - $28 Digital / 503-643-5204 Thermometer www.comarkltd. Industrial Infrared $92 - 270 com Laboratory Mercury $15 - $60 Miller Weber Liquid filled 718-821-7110 Digital $20 - $100 (Performather www.millerwebe Liquid filled $20 – $60 m), r.com Infrared $92 - $270 Digital, Freezer/ Bi-metal $6 - $15 Bi-metal Refrigeration Liquid filled $2 - $28 thermometer Taylor Liquid filled, 630-954-1250 Digital, www.taylorusa.c Advantages/Disadvantages Bi-metal om The benefits of using a digital or infrared thermometer thermometer are that they are very accurate and Weiss Liquid filled, 631-207-1200 easy to read. Infrared thermometers are much Instruments Digital, www.weissinstru more costly than digital thermometers but in Bi-metal ments.com thermometer some applications the use of an infrared Cooper Liquid filled, 860-349-3473 thermometer is necessary. All thermometers, Instrument Digital www.cooperinstr whether they are mercury, digital, bi-metal or Corporation thermometer ument.com organic liquid, do need to be re-calibrated at least

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Manufacturer Product Phone Number electrical properties (resistance or capacitance) Name & Website that change as the atmospheric pressure changes. Becton Liquid filled, 201-847-6800 These sensors are considered to be just as Dickenson Digital www.bd.com thermometer accurate as a traditional or an aneroid barometer. Mannix Infrared, 516-887-7979 Additional electronic circuitry converts the Digital www.mannix- sensor output into a digital display. There is also thermometer inst.com a device called a water barometer that is similar to a traditional mercury barometer. Changes in Summary air pressure cause the water to rise and fall in the It is apparent that there are many alternatives to spout. Low water level indicates high pressure mercury thermometers that are cost effective and and fair weather. The water level rises as the air acceptable. However, a Food and Drug pressure falls. Administration procedure for food processing was identified that requires at least one mercury- Cost in-glass thermometer for each retort. This The digital barometer can cost between $50 - requirement is outlined in the Code of Federal $300 depending on the manufacturer and the Regulations under: 21 CFR Ch. 1 Part 113 – other applications the digital barometer can Thermally Processed Low-acid Foods Packaged perform. Because mercury barometers and in Hermetically Sealed Containers. aneroid barometers are often considered An example of a successful mercury collector’s items, their prices are much higher, thermometer replacement program is the ranging from $100 to over $1000. “Mercury Thermometer Swap” program undertaken by the University of Vermont. More Advantages/Disadvantages than 1,400 mercury thermometers were replaced Aneroid barometers have been used for with non-mercury alternatives under this approximately 200 years and are considered just program. The majority of these replacements as accurate as the traditional mercury barometer. occurred in laboratories within the chemistry The digital barometer is programmable and is department. (Winkler, 1999) considered to be as accurate as the mercury barometer. 4.6 Barometers Manufacturers Description The following are manufacturers of alternatives Barometers are used to measure the atmospheric to mercury barometers. pressure. The barometer is a long cylindrical tube filled with mercury. The mercury is Manufacturer Product Phone Number/ displaced by the atmospheric pressure. When the Name Website Howard Miller Aneroid www.howardmiller.c mercury level rises in a barometer it indicates barometer om increasing air pressure; when the mercury level is decreasing it indicates decreasing air pressure. Weems & Aneroid 410-263-6700 Plath barometer www.weems - Alternatives plath.com Bacharach Digital 724-334-5000/1-800- The aneroid barometer is more compact and barometer 736-4666 consists of an evacuated metal diaphragm linked www.bacharach- mechanically to an indicating needle. As inc.com atmospheric pressure increases or decreases the Kestrel Digital 610-447-1555 diaphragm compresses or expands, causing the barometer www.nkhome.com indicating needle to show the change in pressure. The digital barometer contains a sensor with

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Summary Cost The aneroid and digital barometers are cost The spirit-filled sling psychrometer and the effective, in use, and acceptable alternatives to spirit-filled hygrometer are both similar in the mercury barometer. pricing when compared to mercury versions of the same product. The digital psychrometer was 4.7 Psychrometers/Hygrometers found to be more expensive than the spirit filled version, but the digital hygrometer was found to Description be less expensive than the spirit filled version, A hygrometer is an instrument used to measure ranging from $15 to $60. the moisture content of air or any gas. The most common type of hygrometer is the "dry and wet- Advantages/Disadvantages bulb psychrometer." The psychrometer is best The digital hygrometer and digital psychrometer described as two mercury thermometers, one provide much more accurate results when with a wetted base, and one with a dry base. The properly calibrated because the possibility of water from the wet base evaporates and absorbs human error is eliminated. heat causing the thermometer reading to drop. Using a calculation table, the reading from the Manufacturers dry thermometer and the reading drop from the The following are manufacturers of alternatives wet thermometer are used to determine the to mercury psychrometers and hydrometers: relative humidity. The sling psychrometer is also used to Manufacturer Product Phone Number Name & Website determine relative humidity and is reliably Bacharach Spirit filled 1-800-736-4666 measured by both digital and alcohol type psychrometers www.bacharach- psychrometers. The sling psychrometer is inc.com basically a thermometer encased in a swiveling Testo Digital 973-252-1720/1- mechanism that is swung around rapidly to psychrometers 800-227-0729 www.testo.com record an accurate reading for relative humidity. Miller Weber Digital 718-821-7110 Psychrometers function the same as a hygrometer www.millerwebe hygrometers, however the names are different r.com due to the applications for which they are used. Mannix Spirit filled 516-887-7979 For example, the hygrometer is used to monitor psychrometers www.mannix- the moisture in the storage area for cigar tobacco inst.com Tramex Digital 353-1-282 3688 used by manufacturers and cigar aficionados. hygrometer www.tramexltd.c Atmospheric scientists and weather enthusiasts om use the psychrometer to monitor outdoor humidity and moisture content. Summary The spirit filled psychrometers and digital Alternatives hydrometers appear to be acceptable, cost Spirit-filled thermometers can be used in effective alternatives to mercury filled devices. psychrometers instead of the mercury thermometers and provide equally accurate results. Another alternative is the digital 4.8 Hydrometers hygrometer that uses electronic sensors and a digital program to measure the humidity of the Description air. Both the digital hygrometer and spirit filled A hydrometer is a device that measures the hygrometer are relatively inexpensive, are readily density or specific gravity of a liquid. available, and currently in use. Hydrometers are calibrated based upon the

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specific gravity of water at 60°C being 1.000. Liquids denser than water will have a higher specific gravity, while liquids less dense will 4.9 Flow meters have a lower specific gravity. The hydrometer is used for many applications. For example it is Description used in the petroleum and dairy industries, as Flow meters are used in many areas for well as in amateur wine and beer making. measuring the flow of gas, water, air, and steam. They are used in water treatment, sewage plants, Alternatives power stations, and other industrial applications. An alternative to a mercury hydrometer is the spirit filled hydrometer. The spirit filled Alternatives hydrometer comes customized to suit individual The manufacturers contacted stated that they did applications. The manufacturer should be not use mercury in the manufacturing of new consulted to use the most appropriate flow meters. However, most older flow meters hydrometer. still in use contain mercury. Non-mercury alternatives include digital and ball actuated flow Cost meters. The cost of a mercury hydrometer ranges from $12 to $30, or about $2 less on average than a Cost spirit filled hydrometer. The cost associated with flow meters depends on the application. Some flow meters are custom Advantages/Disadvantages designed for certain applications, which can The accuracy of a spirit filled hydrometer is increase the cost. The manufacturers contacted considered to be comparable to a mercury declined to provide a price range because they hydrometer. felt it would be misleading.

Manufacturers Manufacturers The following are manufacturers of alternatives The following are manufacturers of alternatives to mercury hydrometers: to mercury containing flow meters:

Manufacturer Product Phone Manufacturer Product Phone Name Number Name Number Website Website Miller Weber Alcohol/spirit 718-821-7110 Eldridge Digital and 1-800-321- filled www.millerwe Products, Inc ball actuated 3569 hydrometer ber.com flow meters www.epiflow.

com Ertco (ever Alcohol/spirit 1-800-453- Flow Digital and 602-437-1315 ready filled 7826 Technology ball actuated www.ftimeters thermometers) hydrometer www.ertco.co flow meters .com m Alloborg Digital and 1-800-866- ICL Alcohol/spirit www.icllabs.c Instruments & ball actuated 3837 Calibration filled om Controls flow meters www.aalborg.c Laboratories hydrometer om

John C. Ernst Digital and 973-989-0300 ball actuated www.johnerns Summary flow meters t.com The spirit filled hydrometer is cost effective, in Lake Monitors Digital and 1-800-850- use, and an acceptable alternative to the mercury ball actuated 6110 hydrometer. flow meters www.lakemon itors.com

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Manufacturer Product Phone are also available, and use a thermocouple with a Name Number digital output screen that relays the temperature. Website Universal Digital and 248-542-9635 Flow Monitors ball actuated www.flowmet Cost flow meters ers.com The cost of an optical pyrometer is in the range of $3000. The cost of a digital pyrometer is less Digiflow Digital flow 419-756-1746 than an optical pyrometer, and can cost between Systems meters www.digiflow $180 to $300 depending on the manufacturer. sys.com Primary Flow Digital and 877-737-3569 No manufacturers of a mercury pyrometer could Signal, Inc. ball actuated www.primaryf be located, and therefore a price for a mercury flow meters lowsignal.com pyrometer could not be determined. Manufacturers of the alternatives would not Summary speculate about the cost of a mercury pyrometer. It appears that mercury flow meters are no longer being manufactured, and alternatives to older Advantages/Disadvantages mercury flow meters are in use, cost effective, Optical pyrometers are used in applications of and acceptable. extreme heat and are extremely accurate. The digital pyrometers are also considered to be functional and reliable for temperature reading 4.10 Pyrometers but not as accurate as an optical pyrometer at higher temperatures. Description Pyrometers are used to measure the temperature Manufacturers of extremely hot materials, and are used The following are manufacturers of alternatives primarily in foundry applications. No to mercury pyrometers: manufacturers were identified that currently Manufacturer Product Phone provide mercury pyrometers. Some pyrometers Name Number still in use do have mercury within the Website temperature-sensing device. EDL Optical/digital 1-800-342- pyrometers 5335 Alternatives www.edl- There are two alternatives available, the optical inc.com MIFCO Digital 217-446-0941 pyrometer and the digital pyrometer. An optical pyrometer www.mifco.co pyrometer is a device that allows temperature to m be measured by using incandescence color. The Spectrodyne Optical/ 215-977-7780 theory behind an optical pyrometer is that when a pyrometers www.spectrod substance is heated to about 700°C, it begins to yne.com Precision Optical/ 1-800-468- glow a deep red color. This indicates that the Pyrometer pyrometers 7976 object is emitting enough energy in the visible www.pyromet portion of the spectrum for detection. As the er.com temperature increases, the object changes from red to orange to white, with concurrent dramatic Summary increases in brightness. The hot target is viewed It appears that the mercury pyrometer is no through an optical system that contains a lamp longer being manufactured, but may be in use in filament whose brightness can be adjusted until it some locations. The digital and optical equals that of the target, and gives you an already pyrometers are reliable technologies which known temperature that has been measured and function as alternatives to the mercury recorded into the pyrometer. Digital pyrometers pyrometer.

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light industrial purposes report that they may not meet the most demanding applications. Situations in which digital thermostats would not 4.11 Thermostats (industrial and perform as well as mercury products are cases of extreme environmental conditions and areas at manufacturing) risk of explosions or fire.

Description Manufacturers Industrial thermostats provide temperature The following are manufacturers of industrial control in manufacturing and industrial settings. thermostats: The mercury thermostat uses a mercury switch to activate the heating/cooling device. The mercury in the switch is part of an electric current relay Manufacturer Product Phone Number which relies on an electric current to activate and Name & Website deactivate the heating/cooling device when the Chromalox Thermostats 412-967-3800 mercury in the switch is tipped. http://www.myc hromalox.com/ Honeywell Thermostats 612-951-1000 Alternatives International www.honeywell. Digital electronic thermostats are available for com industrial type workloads and temperature Kelvin Thermostats 1-800-458-5246 control. Digital thermostats use a simple device Technologies www.kelvintech. called a thermistor to measure temperature. A com thermistor is a resistor whose electrical resistance changes with temperature. The microcontroller in Summary a digital thermostat can measure the resistance It appears that no functional alternatives to and convert that number to a temperature mercury thermostats for industrial settings with reading. harsh environmental conditions are available.

Costs Manufacturers were unable to provide specific price quotes because industrial thermostats are 4.12 Float Switches often custom tailored to meet the requirements of a specific application. The price is then derived There are two basic types of float switches: 1) on an application specific basis. Manufacturers a float switch can be located in a buoyant float believed it would be misleading to provide a housing and is actuated based upon rising and price range of industrial thermostats they had falling liquid levels, or 2) a float switch can be previously manufactured for specific stationary and is actuated by the presence or applications. absence of liquid. Float switches are used for liquid monitoring and control in tanks, wells, Advantages/Disadvantages chambers, drillings, and other containers. Float Digital thermostats have limits that should be switches are used to actuate alarm and control researched by the buyer to determine the type of circuits. Float switches have been used for thermostat best suited for an industrial purpose. monitoring various liquids including, among Many industrial thermostats are needed to others, water, sewage, wet sludge, oil, chemicals, regulate higher temperatures than household grease, and liquid nitrogen. thermostats. Industrial thermostats are created to A float switch is a versatile component used be more durable and withstand higher to meet the needs of thousands of varied products temperatures and harsher environments. and applications. A float switch can be Manufacturers who supply digital thermostats for incorporated into a product (e.g. bilge pumps,

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automobiles, etc.), or can be purchased as a processes, food processing, power component to be used in a customer specific stations, etc. application (e.g. waste treatment plant). Listed below are examples of products and applications There are numerous design parameters that that use float switches. Many of these products affect the specification and selection of a float and applications may already use non-mercury switch for a particular product or application. float switches. : Float switch design and product options vary greatly by manufacturer. The design · Pump control: bilge, sump, utility, requirements have a significant impact on shower, effluent, waste, lubrication, etc. technology selection, manufacturer selection, product model selection, product option · Equipment Control: magnetic valve, selection, and ultimate product cost. The cooling equipment, motors, etc. following is a concise listing of some of the more critical design parameters: · Alarm/Outputs: programmable logic controllers, distributed control systems, · Switch points: number of control points, supervisory control and data acquisition, number of alarm points, field adjustable etc. points, etc.

· Industrial/manufacturing: processing · Level detection: point level, continuous liquids, waste treatment, air conditioners, level semiconductor manufacturing, automatic plating machinery, etc. · Accuracy: tolerances, calibration requirements · Residential: sump pumps, septic tanks, hot water heaters, automatic plumbing · Liquid environment: viscosity, fixtures, etc. conductivity, foam, bubbles, turbulence, contaminants, debris, etc. · Marine: bilge pumps, shower pumps, ocean liner sewage disposal, balance tank · Mounting: side, bottom, or top of on ships, etc. enclosure, free standing/suspended cable, pipe mount, stem mount, etc. · Automobile: fuel tank, windshield wash reservoir, etc. · Output contact rating: inductive load, resistive load, current, voltage, power, · Municipal: pumping stations, waste water etc. treatment, sewage plants, etc. · Buoyancy: ball, counterweight, specific · Commercial: boilers, vending machines, gravity, etc. electrical equipment such as liquid insulated transformers, etc. · Life expectancy: switch, controlled equipment, etc. · Miscellaneous: food processing, irrigation systems, petrochemical processing, · Regulatory approval: Underwriters laundry tray, food warmers, steam Laboratories, Canadian Standards cookers, mineral processing, hydraulic Association, etc. equipment, water filters, pharmaceutical

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· Operating parameters: differential non-mercury mechanical float switch at a cost between control/alarm points, angle of less than the mercury float switch for the same operation, etc. functionality. One manufacturer charged more for a metallic · Environmental conditions: temperature, ball float switch than for a mercury float switch pressure, explosiveness, shock, vibration, with comparable functionality. corrosiveness, moving equipment, etc. Advantages/Disadvantages · Input power requirements: 115 Volts AC, The mercury float switch has high reliability and 230 Volts AC, 24 Volts DC, 12 Volts DC, long operational life because it has few other components and is not subject to arcing. Life- cycle testing has been conducted for more than · Switch: number of poles, number of one million cycles. The mercury float switch can throws, normally open, normally closed, handle a high inductive load, has a quiet relay, etc. operation, has no bounce on contact, and can be hermetically sealed to provide increased · Other parameters: signal time delay (to protection from various environmental factors compensate for wave action), float switch (e.g. dust, moisture, etc.). The mercury float enclosure material, intrinsically safe, switch can use one float for both on and off cleaning requirements, space available for functions. operation, etc. The mercury float switch requires a swing area to properly operate. If the application is in a tight location (e.g. windshield washer reservoir), Mercury Float Switch then a magnet/reed float switch may be more appropriate. Because the switch contains Description mercury, it is becoming less desirable for many A mercury float switch is typically located in a applications, including the food and beverage buoyant float housing and is actuated based upon industry. the rising and falling liquid levels. The mercury float switch contains a small tube with electrical Manufacturers contacts at one end of the tube. As the tube lifts, The following are manufacturers of mercury float the mercury collects at the lower end, providing a switches. conductive path to complete the circuit. When the switch is tilted back the circuit is broken. Manufacturer Product Phone Number & The mercury float switch operates in a similar Name Website Advanced 7000 888-340-8820 fashion to the mercury tilt switch. The mercury Control Series www.actsensors.com content reported to IMERC for float switches Technology, was in the range of greater than 1,000 mg/switch. Inc. Comus Numerous 973-777-8405 Cost International models www.comus- The cost of a mercury float switch is intl.com approximately $15 to $150 depending upon Conery 2900 419-289-1444 product type or application requirements. Two Manufacturing Series www.conerymfg.co manufacturers were identified that have both Inc. m mercury and non-mercury float switches with the same functionality. These manufacturers charge Contegra Inc. FS 96 651-905-0900 the same price for the mercury float switch and www.contegra.com the non-mercury mechanical float switch. One manufacturer was identified that provides the

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Manufacturer Product Phone Number & same price for the mercury float switch and the Name Website non-mercury mechanical float switch. One Electro- MLS 800-328-6170 manufacturer was identified that provides the sensors, Inc. Series www.electro- sensors.com non-mercury mechanical float switch at a cost less than the mercury float switch for the same ITT Industries E-8, 80, 773-267-1600 functionality. McDonnell & 65, and www.mcdonnellmill Miller 165 series er.com Advantages/Disadvantages

ITT Industries Models 978-281-0440 The mechanical float switch has high reliability, Rule Industries 35, 37, & www.rule- long operational life, can handle high inductive 40 industries.com loads, and can be hermetically sealed to provide Mercury A, B, C, 616-663-8574 increased protection from various environmental Displacement & D www.mdius.com factors (e.g. dust, moisture, etc.). Mechanical Industries Inc. Series switches are often designed to have an Scientific FG Series 888-525-7300 Technologies www.levelandflow.c operational life in excess of one million cycles. Inc. om The mechanical float switch can use one float for both on and off functions. Septronics, 4701, 888-565-8908 The mechanical float switch typically needs a Inc. 4704 www.septronicsinc.c swing area to properly operate. However, this is Series om not the case for mechanical float switches that Signal FS121, 732-793-4668 use magnets in a vertical stem to activate the Systems CW101 www.signalsystem.c micro-switch. International Series om Inc. Manufacturers S.J. Electro Numerous 888-342-5753 The following are manufacturers of mechanical Systems Inc. Models www.sjerhombus.co m float switches:

Manufacturer Product Phone Number & Alternative 1: Mechanical Switch Name Website Advanced 7300 888-340-8820 Description Control Series www.actsensors.com Technology, A mechanical float switch is typically located in Inc. a buoyant float housing and is actuated based Aggressive AMF 248-477-5300 upon the rising and falling liquid levels. The Systems, Inc. Series www.aggressivesyste mechanical switch can be a snap switch or micro- ms.com switch that can be actuated using a variety of Contegra Inc. FS90 651-905-0900 methods. The most common method is that the Series www.contegra.com lever arm is actuated by a metallic rolling ball Dwyer L6, L8 219-879-8000 that changes position based upon gravity and the Instruments, Series www.dwyer-inst.com position of the buoyant float housing. Inc. (Mercoid) Cost ITT Industries FS20 949-609-5106 Jabsco www.jabsco.com The cost of a mechanical float switch is approximately $10 to $150 depending on product ITT Industries ECO- 978-281-0440 or application requirements. Two manufacturers Rule Industries Switch www.rule- were identified that have both mercury and non- Model 39 industries.com mercury float switches with the same functionality. These manufacturers charge the

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Manufacturer Product Phone Number & Cost Name Website The magnetic dry reed float switch cost is Kari-Finn Numerous Scientific approximately $6 to $500 depending on product (Finland) models Technologies Inc.: U.S. Rep: 888-525-7300 or application requirements. STI www.kari-finn.fi Automation Advantages/Disadvantages Sensors The magnetic dry reed switch is ideal for use in Division small or narrow enclosures. The magnetic dry Kobold NGS 800-998-1020 series www.kobold.com reed switch has a long operational life. The magnetic dry reed switch cannot handle a Lovett Marine Models 800-673-5976 high inductive load, and therefore has a low 3208 and www.lovettmarine.co contact rating. The magnetic dry reed switch 3209 m must be used in a clean environment, because debris collected on the stem will impair proper Mercury Numerous 616-663-8574 Displacement models www.mdius.com functioning. The reed switch can have its Industries Inc. contacts welded together when exposed to high MJK 7030 Danfoss: voltage sources. Automation Series 800-621-8806 (Denmark) www.us.water.danfos Danfoss – U.S. s.com Representative Manufacturers The following are manufacturers of magnetic dry Nivelco Nivofloat Hitech reed switches: (Hungary) and 215-321-6012 Hitech – U.S. NivoMag www.nivelco.com Manufacturer Product Phone Number Representative MK-200 Name & Website Series Advanced Numerous 888-340-8820 Scientific FT, FTN, 888-525-7300 Control models www.actsensors. Technologies and MLS www.levelandflow.c Technology, Inc. com Inc. Series om Aggressive AOE model 248-477-5300 Septronics, SD and 888-565-8908 Systems, Inc. www.aggressive Inc. HD www.septronicsinc.c systems.com models om Barksdale, Inc. BLS Series 800-835-1060 www.barksdale.c Zoeller Numerous 800-928-7867 om models www.zoeller.com Clark Reliance Magnicator 281-240-4243 Corporation II Model www.clark- Jerguson Gage RS-2 reliance.com Alternative 2: Magnetic Dry Reed and Valve Switch Division Comus Numerous 973-777-8405 International models www.comus- Description intl.com Permanent magnets are embedded in the float housing that move vertically along the tubing or Crydom RSF Series 619-210-1600 stem. The reed switches are embedded in the Magnetics (UK) www.crydom.co. stem. The magnets activate the reed switches in uk the stem at pre-determined levels for control or Dwyer F7 Series 219-879-8000 Instruments, Inc. www.dwyer- alarm purposes. inst.com

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Manufacturer Product Phone Number The optical float switch has a higher price Name & Website range than other float switch technologies. Flowline Liquid Numerous 562-598-3015 Intelligence models www.flowline.co m Manufacturers The following are manufacturers of optical float Innovative LS and SM 860-621-7220 switches: Components Series www.liquidlevel. com Manufacturer Product Phone Number & Name Website Kobold Model N 800-998-1020 Com Fiber Optic 954-600-1962 www.kobold.co connection Float Switch http://comconnecti m on.tripod.com Dwyer OLS Series 219-879-8000 K-Tech Numerous 905-840-7106 Instruments, www.dwyer- Industrial models www.process- Inc. inst.com Products Inc. controls.com/KT ech Kobold OPT Series 800-998-1020 Nivelco NivoPoint Hitech www.kobold.com (Hungary) 215-321-6012 Hitech – U.S. www.nivelco.co Pulnix FL, FLH 800-445-5444 Representative m America Inc. Series www.pulnix.com Scientific FCN, LF, 888-525-7300 Technologies FL, SLS, www.levelandflo Scientific OPL Series 888-525-7300 Inc. and TLS w.com Technologies www.levelandflow. Series Inc. com Signal Systems Numerous 732-793-4668 International Inc. models www.signalsyste m.com

Alternative 4: Conductivity

Alternative 3: Optical Float Switch Description The conductivity float switch uses electrodes to

Description measure conductivity and sense the presence or The optical float switch utilizes optical principles absence of a liquid. It relies on the conducting to detect the presence or absence of a liquid as properties of liquids to complete an electrical compared with air. The sensor contains a small circuit between electrodes, or between an infrared LED and a phototransistor light receiver electrode and the metal tank. to detect the presence of liquid. Cost Cost The cost of a conductivity float switch is The cost of an optical float switch is approximately $40 to $800 depending on product approximately $120 to $400 depending on or application requirements. product or application requirements. Advantages/Disadvantages Advantages/Disadvantages The conductivity float switch has no moving The optical sensor is unaffected by liquid color or parts and is therefore very reliable and can be density. The optical float switch has very slight used in vessels with moving equipment that may hysteresis, high repeatability, and is highly damage other types of float switches. The chemical resistant. conductivity sensor can sense the presence of different liquids. For bilge pump applications, it

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can detect gas, oil, and diesel fuel in bilge water that can trigger an automatic shutdown of the pump. This prevents pumping of contaminants Alternative 5: Metallic Ball into waterways. The conductivity float switch must be used in Description a conductive liquid for proper operation. A rolling metallic ball is used to make or break the actual electrical connection for a circuit. The Manufacturers metallic ball moves based on the float movement The following are manufacturers of conductivity as the liquid level rises and falls. float switches: Cost Manufacturer Product Phone Number One manufacturer reported that the cost of their Name Website metallic ball switch is about 10 – 15% higher Advanced Numerous 888-340-8820 Control models www.actsensors. than their mercury float switch with similar Technology, Inc. com functionality.

Aggressive IPF model 248-477-5300 Advantages/Disadvantages Systems, Inc. www.aggressive The metallic ball float switch can have a long life systems.com if it is only used for small rated loads. ITT Industries LPC series 773-267-1600 The metallic ball float switch is not suitable McDonnell & www.mcdonnell for applications subject to shock or vibration Miller miller.com because it can experience false contacts due to bounce. The metallic ball float switch requires a Kari-Finn Numerous STI: 888-525- swing area for proper operation. The metallic (Finland) models 7300 U.S. Rep: www.kari-finn.fi ball can become welded to the electrical contacts STI Automation due to overheating or arcing. The metallic ball Sensors Division float switch cannot handle loads greater than two Kobold NEH, NEW 800-998-1020 amps without experiencing arcing issues. Models www.kobold.co m Manufacturers MJK Conduct- Danfoss : The following is a manufacturer of metallic ball Automation ivity Level 800-621-8806 float switches: (Denmark) Switch 501 www.us.water.da Danfoss – U.S. nfoss.com Manufacturer Product Phone Number Representative Name Website Comus Numerous 973-777-8405 Nivelco NivoCont K Hitech International models www.comus- (Hungary) Series 215-321-6012 intl.com Hitech – U.S. www.nivelco.co Representative m

Product Bilge Buddy 845-796-4526 Innovators www.411web.co m/P/ Alternative 6: Sonic/Ultrasonic PRODUCTINN OVATORS/ Description Default.htm Scientific ELS Series 888-525-7300 The sonic/ultrasonic float switch utilizes a sensor Technologies www.levelandflo containing a piezoelectrical crystal. The crystal Inc. w.com excites oscillations, allowing the liquid level to be measured by oscillation frequency. As the

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probe tip becomes immersed in liquid, the Manufacturer Product Phone Number crystals acoustically couple and the switch Name & Website changes state. Ohmart Vega Vegaswing 800-367-5383 Series www.ohmartveg a.com Cost The cost of a sonic/ultrasonic float switch is Scientific DFN-30 888-525-7300 approximately $150 to $600 depending on Technologies Series www.levelandflo product or application requirements. Inc. w.com

Siemens ULS 200 817-277-3543 Advantages/Disadvantages Milltronics Series www.milltronics. The sonic/ultrasonic float switch is highly com accurate and can be used for non-conductive liquids as well as highly viscous liquids. The sensor can be quickly removed for cleaning as required by the food, beverage, and pharmaceutical industries. Alternative 7: Pressure Transmitter The sonic/ultrasonic sensor needs to be rigid mounted for proper operation. Description The pressure transmitter float switch utilizes one Manufacturers of two technologies: The following are manufacturers of 1) The float switch is actuated by a piezo- sonic/ultrasonic float switches: recitative mechanism that senses the hydrostatic pressure within a container. Manufacturer Product Phone Number 2) The float switch is actuated by Name & Website compression of a captive air column in Advanced ELC - 8 888-340-8820 the detecting pipe beneath a diaphragm. Control www.actsensors. Technology, Inc. com Cost Cosense Inc. LL Series 631-231-0735 One manufacturer sells one of its pressure www.cosense.co transmitter models for $825. A cost range for all m available models was not determined, but will

Dwyer GS Series 219-879-8000 depend on product or application requirements. Instruments, Inc. www.dwyer- inst.com Advantages/Disadvantages The piezo-recitative technology provides highly Flowline Liquid Numerous 562-598-3015 reliable results. The diaphragm technology can Intelligence models www.flowline.co be used in applications where electrical power is m not available or hazardous conditions exist. Kobold NWS Model 800-998-1020 www.kobold.co Manufacturers m The following are manufacturers of pressure transmitter float switches: MJK MJK 7005 Danfoss :

Automation 800-621-8806 Manufacturer Product Phone Number & (Denmark) www.us.water.da Name Website Danfoss – U.S. nfoss.com Dwyer PLT 219-879-8000 Representative Instruments, Inc. Series www.dwyer- inst.com

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Manufacturer Product Phone Number & Manufacturer Product Phone Number Name Website Name Website MJK MJK Danfoss: Comus Alloy float 973-777-8405 Automation 7050, 800-621-8806 International switch www.comus- (Denmark) 7060 www.us.water.danf intl.com Danfoss – U.S. oss.com Representative Scientific NLS 888-525-7300 Technologies Series www.levelandflow. Inc. com Alternative 9: Thermal

Description The thermal float switch utilizes the thermal

dispersion principle of the dissipation of heat by Alternative 8: Alloy a liquid to detect the presence or absence of a liquid as compared with air. The sensor typically Description contains a resistor in the form of a thermistor. A A gallium indium alloy replicates the fluid and thermistor is a semiconductor material that electrical properties of mercury. This alloy is detects heat and converts heat into an electrical used as a direct replacement of mercury within signal. The switch is actuated when heat the switch. generated by the thermistor is dissipated by a liquid. Cost The alloy float switch has limited commercial Cost usage and is still in the early development stage. The cost of a thermal float switch was obtained The cost of an alloy float switch is significantly for one model from one manufacturer for $87. A higher than a mercury switch, ball contact switch, range of values was not available at the time this or magnetic/reed switch. report was completed.

Advantages/Disadvantages Advantages/Disadvantages The gallium indium alloy functions as a direct The thermal float switch can be used for caustic replacement for mercury within the switch and liquids such as acids and alkalines. Light to therefore provides similar advantages such as moderate buildup on the sensor will not affect quiet operation, high reliability, and long thermal dispersion performance. operational life. This alloy eliminates bounce The thermal float switch is not suited for high problems and false contacts associated with the temperature applications, and cannot be used for metallic ball contact device. high viscosity liquids. The gallium indium alloy cannot be used in applications less than 20 degrees Fahrenheit. Manufacturers This precludes its use for many non-water The following are manufacturers of thermal float applications. The gallium indium alloy is switch sensors: difficult to handle, will oxidize easily, and is potentially toxic. Manufacturer Product Phone Number & Name Website Manufacturers JC Controls SN Series 877-837-6677 The following are manufacturers of alloy float www.ln2.net switches: Scientific TDL 888-525-7300 Technologies Series www.levelandflow.co Inc. m

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products and applications. It appears that these non-mercury alternatives are cost competitive Alternative 10: Capacitance and can meet the functional requirements for new float switch products and applications. However, Description these non-mercury alternatives may not meet the The capacitance level float switch is typically requirements for retrofitting all existing float comprised of two electrodes separated by an switch products and applications. insulating medium. Air provides a reference capacitance value, and when the probe is covered by liquid the resultant capacitance change causes a signal to actuate the switch. 4.13 Tilt Switches

Cost Tilt switches sense changes in position or The cost of a capacitance float switch is rotation and actuate a switch based upon these approximately $150 to $500 depending on changes. The tilt switch can be used to activate product or application requirements. alarms, control equipment, turn on lights, or accomplish other functions. Advantages/Disadvantages A tilt switch is a versatile component used to The capacitance float switch contains no moving meet the needs of hundreds of position parts, has extremely high chemical resistance, monitoring/control products and applications. A and moderate vibration resistance. tilt switch can be incorporated into a product (e.g. The capacitance float switch cannot be used video cameras, motion detectors, etc.), or can be for highly viscous liquids. purchased as a component to be used in a customer specific application (e.g. mining Manufacturers operations). Listed below are examples of The following are manufacturers of capacitance products and applications that use tilt switches. float switches: Many of these products and applications may already use non-mercury tilt switches. Manufacturer Product Phone Number Name Website Dwyer CLS 219-879-8000 · Test & Laboratory Equipment: precision Instruments, Series www.dwyer-inst.com measuring devices, plotters, power Inc. supplies, etc. Flowline Numerous 562-598-3015 Liquid models www.flowline.com · Heavy equipment: construction vehicles, Intelligence Kobold NTS 800-998-1020 cranes, hoists, chutes, scissor lifts, static Series www.kobold.com platforms, etc.

Robertshaw Model 865-981-3100 · Industrial: processing equipment, 304B www.robertshawindu strial.com conveyor controls, extruders, speed controls, foot pedals, coal level Scientific CP30 888-525-7300 monitoring, etc. Technologies Series www.levelandflow.c Inc. om · Marine: rudder controls, deep sea

manipulators, salt water platforms, ship & Summary barge leveling etc. There are numerous non-mercury alternative technologies currently in use for float switch

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· Medical equipment: x-ray machines, MRI scanners, position controls, wheelchairs, · Measurement requirements: tilt or etc. rotation angle, number of axes, etc.

· Robotics: analog inputs, remote operated · Switch points: number of control points, vehicles, creature animation, etc. number of alarm points, field adjustable points, etc. · Agriculture: tractors, conveyor controls, food processing, bins, silos, grain level · Accuracy: tolerances, calibration monitoring, etc. requirements

· Other: signaling alarms, lights, interfacing · Output contact rating: inductive loading with programmable logic controllers, (amps, voltage, power), resistive loading personnel digital assistants, cell phones, (amps, voltage, power) computer security, anti tamper devices, utility metering, pump control, digital · Life expectancy: switch, controlled cameras, video cameras, portable space equipment, etc. heaters, pinball game machine, swimming pools, payphones, survey leveling · Regulatory approval: Underwriters equipment, gyroscopes, steam irons, anti- Laboratories, Canadian Standards locking brake systems, digital compass Association, etc. correction, submarines, virtual reality equipment, oil rig leveling, laser · Operating parameters: differential instruments, geophysical monitoring, between control/alarm points, angle of laser leveling, grading, continuous operation, etc. casting, weapons platform leveling, wheel alignment, land navigation, auto security, · Environmental conditions: temperature, RVs, exercise equipment, automobiles, pressure, explosiveness, shock, vibration, glove compartments, video cameras, corrosiveness, moving equipment, etc. commercial popcorn poppers, electric organs, space heaters, oil well pump · Input power requirements: 115 Volts AC, control, machine tools, fishing lures, 230 Volts AC, 24 Volts DC, 12 Volts DC, greenhouses, motion detectors, pneumatic other tube communication, man-lifts, antenna positioning, mining, aircraft, · Switch output: single pole single throw, transportation, etc. double pole double throw, normally open,

There are numerous design parameters that normally closed, relay, etc. affect the specification and selection of a tilt switch for a particular product or application. · Other parameters: display requirements, Tilt switch basic design and product options vary enclosure material, intrinsically safe, greatly by manufacturer. The design cleaning requirements, space available for requirements have a significant impact on operation, signal time delay, etc. technology selection, manufacturer selection, product model selection, product option Mercury Tilt Switches selection, and ultimate product cost. The following is a concise listing of some of the more Description critical design parameters: Mercury tilt switches are small tubes with electrical contacts at one end of the tube. As the

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tube lifts, the mercury collects at the lower end, Manufacturer Product Phone Number & providing a conductive path to complete the Name Website circuit. When the switch is tilted back the circuit George Risk 4561 800-523-1227 Industries Series www.grisk.com is broken. The mercury content reported by manufacturers to IMERC for tilt switches ranged Kahl Scientific Series 619-444-2158 from 400 mg to 71,000 mg/switch. Instrument 03EA www.kahlsico.com Corporation Cost Siemens Mill- 817-277-3543 Milltronics tronics www.milltronics.c The cost of a mercury tilt switch is approximately Tilt om $2 to $300 depending on product or application Switches requirements. Signal Systems Series 732-793-4668 International Inc. 3004 www.signalsystem. Advantages/Disadvantages com The mercury tilt switch has high reliability and long operational life because it has few components and is not subject to arcing. Life cycle testing has been successfully conducted for Alternative 1: Metallic Ball more than one million cycles. The mercury tilt switch can handle a high inductive load, has a Description quiet operation, has no bounce on contact, and A rolling metallic ball is used to make the actual can be hermetically sealed to provide increased electrical connection. The metallic ball moves protection from various environmental factors based on the movement of the tilt switch housing, (e.g. dust, moisture, etc.). or can be moved by actuator magnets using the The mercury tilt switch contains mercury, principle of spherical magnetism. which is becoming less desirable for many applications including the food and beverage Cost industry. The cost of a metallic ball tilt switch is approximately $1 to $11 depending on product or Manufacturers application requirements. The following are manufacturers of mercury tilt switches. Advantages/Disadvantages The metallic ball tilt switch is suited for Manufacturer Product Phone Number & Name Website applications with high levels of electromagnetic Abra Electronics Model 35- 800-717-2272 interference (EMI) such as generators and 760 www.abra - motors, or high stress applications that require a electronics.com robust switch. The metallic ball tilt switch can have a long life if it is only used for small rated Celduc Relais IB600099 Laube Technology: loads. (France) Series 805-388-1050 Laube www.celduc- The metallic ball tilt switch is not suitable for Technology – relais.com applications subject to shock or vibration because US it can experience false contacts due to bounce. Representative The metallic ball can become welded to the Comus Numerous 973-777-8405 electrical contacts due to overheating or arcing. International models www.comus- intl.com The metallic ball tilt switch cannot handle loads greater than two amps without experiencing Electro-Sensors, MTS 800-328-6170 arcing issues. Inc. Series www.electro- sensors.com

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and shock. Electrolytic tilt sensors have low Manufacturers power consumption. The following are manufacturers of metallic ball Electrolytic tilt sensors are complex devices tilt switches: due to their sensitivity to internal circuitry and external environmental influences. Manufacturer Product Phone Number Name Website Manufacturers Comus Numerous 973-777-8405 International Models The following are manufacturers of electrolytic www.comus- tilt sensors: intl.com Manufacturer Product Phone Number Magnasphere Magna- 262-792-1306 Name Website Corp. sphere www.magnasphereco Switch rp.com Fredericks Numerous 215-947-2500 Signal NM 1001, 732-793-4668 Company models. www.fredericksco Systems NM 2001, www.signalsystem.c m.com International NM 3001, om Inc. NM 4001 Nanotron, Inc. Ultimate I 480-966-9006 and II www.nanotronusa. Series com

Spectron Glass The 631-582-5600 and SP5000 www.spectronsens Alternative 2: Electrolytic Electronics, and ors.com Inc. AU6000 Description series The electrolytic tilt sensorcontains multiple electrodes and is filled with an electrically conductive fluid. As the sensor tilts, the surface of the fluid remains level due to gravity. The Alternative 3: Potentiometers conductivity between the electrodes is proportional to the length of electrode immersed Description in the fluid. Electrically, the sensor is similar to Potentiometers consist of a curved conductive the potentiometer, with resistance changing in track with a connection terminal at each end and proportion to tilt angle. The electrolyte material a moveable wiper connected to a third terminal. can vary in conductivity and viscosity to meet As the shaft of the potentiometer is rotated, the different design parameters. The voltage output length of the electrical path and resistance from the electrolytic tilt sensor can be used for changes proportionally. Potentiometers can be certain tilt switch applications. used to detect linear motion as well as single turn or multiple turn rotation. Cost The cost of an electrolytic tilt sensor is Cost approximately $5 to $50 depending on product or Potentiometers were found to range from application requirements. approximately $0.25 for simple, high volume applications to $300 for high quality audio Advantages/Disadvantages applications. Electrolytic tilt sensors provide excellent repeatability, stability, and accuracy. These Advantages/Disadvantages sensors are rugged and can be used in Potentiometers are inexpensive, reliable, and environments of extreme temperature, humidity, have long operational life, often greater than 20

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million cycles. Potentiometers are also available amount of pressure to actuate the switch action. in micro-miniature size for space saving design The mechanical tilt switch can be used as a limit requirements. switch to detect the position of some moving part. Numerous limit switches can be used to sense multiple positions. Manufacturers The following are manufacturers of Manufacturers potentiometers: The following are manufacturers of mechanical tilt switches: Manufacturer Product Phone Number & Name Website ETI Systems LCP8, 760-929-0749 Manufacturer Product Phone Number & SP12B, www.etisystems.co Name Website Series m/ singledesign.htm Binmasater BM-T 800-278-4241 Precision RV4, RV6 416-744-8840 Series www.binmaster.com Electronic Series www.precisionelect ronics.com Monitor TC Series 800-601-6302 Technologies www.monitortech.co Tocos G3, G4 847-884-6664 LLC m America, Inc. Series www.tocos.com Omron D7E 847-882-2288 Vishay 249, 357, 402-563-6866 Electronics Series www.omron.com 533 Series www.vishay.com

Alternative 4: Mechanical Switch Alternative 5: Solid-State

Description Description The mechanical tilt switch can be a snap switch The solid-state tilt switch is often referred to as or micro-switch that can be actuated in a variety an inclinometer or accelerometer depending upon of methods. The most common method is that the application. Various operational methods are the lever arm is actuated by a metallic rolling ball used including: that changes position based upon gravity and the changing position of the switch housing. · Using a Hall effect integrated circuit sensor that provides a voltage output ratio Cost as a function of the mechanical angle of The cost of a mechanical tilt switch is the shaft approximately $100 to $350 depending on product or application requirements. · Using a highly stable silicon micro- machined capacitive inclination sensor Advantages/Disadvantages element The mechanical tilt switch has high reliability, long operational life, can handle high inductive · Using force balance accelerometer loads, and can be hermetically sealed to provide technology increased protection from various environmental factors (e.g. dust, moisture, etc.). Mechanical tilt Cost switches are often designed to have an The cost of a solid-state tilt switch is operational life in excess of one million cycles. approximately $100 - $250 depending on product The mechanical tilt switch requires only a small or application requirements.

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Cost Advantages/Disadvantages The cost of a capacitive tilt switch is The solid-state tilt switch offers high resolution, approximately $80 to $250 depending on product accuracy, fast response, and maintains its or application requirements. accuracy over temperature ranges. The solid- state tilt switch requires a low supply voltage and Advantages/Disadvantages has a long operational life, often greater than ten The capacitive tilt switch has high accuracy, high million cycles. The solid-state tilt switch can be long-term stability, and low power requirements. used in strong vibration and shock environments. The capacitive tilt switch is suitable for The initial cost is higher than mercury, applications requiring high measurement potentiometer, or electrolytic tilt switches. accuracy with low linearity deviations, and for measurement of relatively large inclination Manufacturers angles. The following are manufacturers of solid-state tilt switches: Manufacturers The following are manufacturers of capacitive tilt Manufacturer Product Phone Number & switches: Name Website Clarostat HRS100 800-872-0042 Manufacturer Product Phone Number Sensors and Series www.clarostat.com Name & Website Controls Measurement Accustar and 800-745-8008 Columbia SI-701 800-813-8471 Specialties Accuswitch www.schaevitz.co Research Labs Series www.columbia Series m researchlab.com Rieker Inc. N Series and 610-534-9000 Crossbow CXTA and 408-965-3300 NG Series www.riekerinc.co CXTLA www.xbow.com m Series Seika NG2, NG3, Reiker Inc. Jewell LSO Series 800-227-5955 (Germany) and NG4 610-534-9000 Instruments www.jewellinstrum Reiker Inc. – Series www.seika.de LLC ents.com U.S. Representative Omron D6B Series 847-882-2288 Electronics www.omron.com Summary

There are numerous non-mercury alternative technologies currently in use for tilt switch products and applications. It appears that these non-mercury alternatives are cost competitive Alternative 6: Capacitive and can meet the functional requirements for new tilt switch products and applications. However, Description these non-mercury alternatives may not meet the The capacitive tilt switch utilizes a capacitive requirements for retrofitting all existing tilt based sensor that produces output directly switch products and applications. proportional to the relative tilt. The sensor is An example of a successful tilt switch typically composed of hermetically sealed replacement program is the “Switch the Switch” capacitive domes with a high dielectric constant program initiated by the Michigan based Clean fluid that fills the space between the domes. Car Campaign. Mercury tilt switches in hood lights and trunk lights were replaced with non- mercury tilt switches in automobiles across the nation. This was a simple, drop-in exchange that

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took about ten minutes per switch to accomplish. · Bellows: A bellows actuated pressure Across the United States, thirteen tilt switch switch uses a bellows elastic element that replacement events took place. Some expands and contracts axially with participating dealerships replaced mercury changes in pressure. Changes in the switches in vehicles on their lots, while other measured pressure cause the bellows to dealerships offered the service, free of charge, to work against an adjustable spring. This their customers. The participating municipal and spring determines the pressure required to state agencies replaced the mercury tilt switches actuate the switch. Through suitable in their fleets of vehicles. (Clean Car Campaign, linkage, the spring causes the contacts to 2002) open or close the electrical circuit automatically when the operating pressure falls below or rises above a specified 4.14 Pressure Switches value.

A pressure switch is a device that converts a · Flex Circuit: A flex circuit diaphragm is a pressure change into an electrical switching small metal diaphragm etched from one function. The pressure change might be measured layer of a circuit board. This diaphragm is as pressure, vacuum, or differential between two able to make contact with another layer, pressure inputs. In every case, the pressure combining sensor and switch. The switch will employ a diaphragm, piston, or other advantage of this device is that it can pressure-responsive sensor, which has been open and close at a very high frequency coupled to actuate a mechanical switch, mercury over a very long duty cycle. switch, or transistor. Examples of pressure responsive sensors used in pressure switches Each type of sensor provides performance include: tradeoffs that must be evaluated for each particular application. For example, bellows · Diaphragm: A diaphragm actuated actuated pressure switches have excellent pressure switch has a large surface area sensitivity, however they are subject to metal and very flexible diaphragm fatigue in rapidly cycling applications. material. This type of sensor is able to A pressure switch is a versatile component convert a relatively small amount of used to meet the needs of hundreds of pressure pressure or vacuum into sufficient monitoring/control products and applications. A mechanical force to actuate a snap-action pressure switch can be incorporated into a switch. In a pressure switch, positive product (e.g. boiler, air conditioner, vacuum pressure pushes the diaphragm. In a cleaner, etc.), or can be purchased as a vacuum switch, negative pressure pulls component to be used in a customer specific the diaphragm. In a differential switch, application (e.g. semiconductor processing). both sides of the switch housing are Listed below are examples of products and linked to two pressure sources, and the applications that use pressure switches. Many of diaphragm responds to the resulting net these products and applications may already use force. non-mercury pressure switches.

· Piston: A piston actuated pressure switch · Heating, ventilation, and air conditioning: uses a metal piston as the sensor. Its electrostatic air cleaners, filter indicators, robust design and stronger materials reservoir level, gas fired heating, enable this type of sensor to work at high ventilation, utility heaters, heat pumps, pressures, or in hostile media. furnaces, flue gas, fuel delivery, etc.

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· Medical: respiratory sensors, therapy tent requirements have a significant impact on nebulizers, automated blood pressure technology selection, manufacturer selection, systems, sip and puff movement controls, product model selection, product option anesthesia leak detection, saline pumps, selection, and ultimate product cost. For tourniquet systems, reverse osmosis example, sensor selection is a key determinant of purification systems, dental aspirator range, sensitivity, accuracy, life expectancy, and pumps, respiratory therapy, disposable cost of a pressure switch. The following is a surgical vacuum systems, etc. concise listing of some of the more critical design parameters: · Automotive: tire pressure, emission control, manifolds, air conditioning, · Variable measured: pressure, vacuum, engine crankcase pressure, air brakes, differential lumbar seat pressure, exhaust gas re- circulation, etc. · Operating parameters: set-point, dead- band, factory set, field adjustable · Appliance: commercial dish washers, floor scrubbers, vacuum cleaners, food · Enclosure: general purpose, weather storage sealers, air conditioners, resistant, explosion proof, etc. commercial fryers, hot water dispensers, hot water heaters, etc. · Regulatory approval: Underwriters Laboratories, Canadian Standards · Other: fire pump controllers, scrubbers, Association, etc. venting hoods, construction equipment, tape braking systems, tape tension · Switch type: mercury, snap switch, controls, door safety, spa pumps, machine micro-switch, transistor, etc. tools, automated test equipment, packaging machinery, pulp digesters, · Switch: number of poles, number of boilers, well heads, polymerization throws, amperage, voltage, hermetically reactor vessels, mine gas samplers, garage sealed, etc. doors, industrial gas pressure sensing, vacuum radon detection, missile guidance · Load: resistive, inductive, other applications, spray painting equipment, semiconductor process equipment, · Accuracy: repeatability, calibration injection water systems, submarine requirements navigation control, robotics, organs, pump control, automobiles, pressurized · Monitoring: local, remote air systems, bioprocess applications, sanitary systems, hydraulic systems, · Mounting: vertical, horizontal sprayers, pressurized tanks, altitude sensing, portable test equipment, fire · Materials: enclosure, sensor, switch, etc. protection systems, and waste treatment plants. · Visual display: status, power on, etc.

There are numerous design parameters that affect the specification and selection of a pressure · Sensor type: diaphragm, bellows, piston, switch for a particular product or application. bulb & capillary, etc. Pressure switch basic design and product options vary greatly by manufacturer. The design · Pressure: range to be measured, maximum operating pressure, etc.

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quiet operation, has no bounce on contact, and · Life expectancy: time in service, number can be hermetically sealed to provide increased of cycles protection from various environmental factors. The mercury pressure switch contains · Electrical connection: terminal block, mercury, which is becoming less desirable for conduit, etc. many applications including the food and beverage industry. · Physical: size, weight, etc. Manufacturers · Power input: 120/240Volts AC, The following is a manufacturer of mercury 12/24Volts DC, current, etc. pressure switches.

Manufacturer Product Phone Number & · Environmental conditions: shock, Name Website vibration, explosion, corrosiveness, Dwyer PQ, PR, 219-879-8000 temperature, humidity, radio frequency Instruments BB, DP, www.dwyer-inst.com interference, etc. (Mercoid) and DA Series

· Other: pressure surge protection, test button, reset button, etc.

Alternative 1: Mechanical Pressure Switches Mercury Pressure Switches Description Description The mechanical pressure switch typically uses a The mercury pressure switch typically uses a piston, diaphragm, bellows, or combination piston, diaphragm, or bellows acting as the piston/diaphragm as the pressure sensor. The pressure sensor to actuate the mercury switch. sensor can either 1) directly actuate the switch, or The mercury content reported by manufacturers 2) use a pushrod, lever, or compression spring to to IMERC for pressure switches was in the range actuate a snap acting micro-switch. of greater than 1,000 mg. Cost Cost The cost of a mechanical pressure switch is The cost of a mercury pressure switch is approximately $40 to $600 depending on product approximately $150 to $170 based on pricing or application requirements. obtained for only two product models. The range could be much greater depending on various Advantages/Disadvantages product and application requirements. One Mechanical pressure switches have high manufacturer provides comparable pricing for reliability, a long operational life, and can also mercury pressure switches and mechanical provide high accuracy when used with a pressure switches with similar functionality. diaphragm sensor. Certain models of the mechanical pressure switch use a diaphragm and Advantages/Disadvantages negative rate Belleville spring that provides The mercury pressure switch has high reliability superior resistance to shock and vibration. and long operational life because it has few components and is not subject to arcing. Life Manufacturers cycle testing has been successfully conducted for The following are manufacturers of mechanical more than one million cycles. The mercury float pressure switches: switch can handle a high inductive load, has a

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Manufacturer Product Phone Number & Name Website Alternative 2: Solid-State Pressure Barksdale, Inc. D1, B1, 800-835-1060 Switches E1S, C9612

Series www.barksdale.co m Description Solid-state pressure switches contain one or more Custom 6800 and 818-341-4610 strain gauge pressure sensors, a transmitter, and Control 6900 Series www.ccsdualsnap. one or more switches all in a compact package. Sensors, Inc. com In addition to opening or closing the pressure

Dwyer PG, DP, 219-879-8000 switch circuit, they can provide a proportional Instruments APS, AVS, www.dwyer- analog or digital output. Diffused silicon (Mercoid) and DS- inst.com piezoresistive sensors are widely used in solid- 7300 Series state pressure switches. The sensor contains Emerson Numerous 314-569-4500 homogeneous silicon measuring cells containing Electric Co., models www.alcocontrols. two vacuum-welded silicon plates. The Alco Controls com Division piezoresistive effect causes element resistance to Hobbs Series 3000 217-753-7752 change proportionally with measured pressure. Corporation and 5000, www.hobbs- Thin film strain gauges can also be used as the (Invensys Series III corp.com pressure sensor. A microprocessor is used to Company) and V process the strain gauge sensor information and Kobold KPH 8000 800-998-1020 and KPH www.kobold.com actuate the switching element. The switching 8200 Series element is typically a transistor. Micro MPL 500 954-973-6166 Pneumatic Series www.pressureswitc Cost Logic, Inc. h.com Solid-state pressure switches cost approximately (MPL) $200 - $350 depending on product or application Neo-dyn/ITT 100P, 152P, 661-295-4000 Industries 160P, 142P, www.neodyn,com requirements. This is higher than the cost for and 182P mechanical or mercury pressure switches. Solid- Series state pressure switches become more cost Potter Electric ADPS 800-325-3936 effective when monitoring more than one point Signal Model www.pottersignal.c and other of its various features are needed. Company om SOR Inc. Series 20 800-676-6794 www.sorinc.com Advantages/Disadvantages Solid-state pressure switches provide higher Tecmark Series 3000 440-205-7600 accuracy than mechanical switches. Solid-state Corporation www.tecmarkcorp. pressure switches can improve process quality, com resulting in reduced scrap and waste. Solid-state Texas Numerous 888-438-2214 pressure switches have long life at rated loads Instruments models www.ti.com that can often be ten million cycles or greater. Solid-state sensors usually have built-in United Electric Spectra 10, 617-926-1000 temperature compensation to ensure accuracy Controls Deltapro 24, www.ueonline.com and Spectra over a wide temperature range. The solid-state 12 Series pressure switch can provide proportional analog Weed Model 800-880-9333 or digital output. The electronic control unit can Instrument GR2/4 www.weedinstrum be mounted remotely from the sensor. Solid- ent.com state pressure sensors often have a built-in keypad and display to simplify setup and ongoing

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field adjustments. Solid-state pressure switches approved, and comply with National Fire provide a wide range of set-point and dead-band Protection Association (NFPA) standards. adjustment. The transistor switch is highly According to the manufacturers, these fire pump reliable, has no contact bounce, accommodates controllers have achieved high customer fast switching, and has no arcing. satisfaction and acceptance. The fire pump The transistor is usually restricted to low-level controllers with non-mercury switches are direct current voltage applications. High considered as reliable as the fire pump controllers temperatures or transient pressure spikes can that use mercury switches. In addition, the two damage a solid-state pressure sensor. manufacturers can now avoid the high costs of shipping replacement mercury pressure switches Manufacturers that are considered a hazardous material. The following are manufacturers of solid-state The following are manufacturers of fire pump pressure switches: controllers that use non-mercury pressure switches: Manufacturer Product Phone Number & Name Website Manufacturer Product Phone Number & Barksdale, Inc. PS Series 800-835-1060 Name Website www.barksdale.com Joslyn Clark Fire Pump 800-476-5463 Controls Controller www.joslynclark.co Kobold PDD 800-998-1020 m Series www.kobold.com Metron Fire Pump 303-592-1903 Controller www.metroninc.com SOR Inc. SGT 800-676-6794 Series www.sorinc.com

United Electric One 617-926-1000 It appears that these non-mercury alternatives are Controls Series www.ueonline.com cost competitive and can meet the functional requirements for new pressure switch products and applications. However, these non-mercury Summary alternatives may not meet the requirements for There are numerous non-mercury alternative retrofitting all existing pressure switch products technologies currently in use for pressure switch and applications. products and applications. The use of pressure switches in fire pump controllers is illustrative. The fire pump controller is used to control diesel and electric pumps that provide water for fire suppression in large buildings. 4.15 Temperature Switches Two fire pump controller manufacturers were identified that discontinued use of mercury A temperature switch is a device that converts a pressure switches, and instead use non-mercury temperature change into an electrical switching pressure switches for their fire pump controllers. function. The temperature switch uses a One manufacturer uses non-mercury pressure temperature responsive sensor that is coupled to a switches for both its diesel and electric fire pump switch. The switch can be a mercury switch, controllers. One manufacturer converted its solid state, micro-switch, or snap switch. The electric fire pump controller line to non-mercury following are examples of temperature sensors switches in 2003, and will convert their diesel commonly used in temperature switches: pump controllers to non-mercury pressure Thermocouple: A thermocouple is comprised switches in 2004. of two wire strips of dissimilar metals. These These fire pump controllers using non- metal wires are joined at one end and the mercury pressure switches are Underwriters voltage is measured at the other end. Changes Laboratories (UL) listed, Factory Mutual (FM) in the temperature at the juncture induce a

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change in electromotive force at the other A temperature switch is a versatile component end. As the temperature goes up, the output used to meet the needs of hundreds of electromotive force of the thermocouple rises. temperature monitoring/control products and There are many different types of applications. A temperature switch can be thermocouples made of different types of incorporated into a product (e.g. food warming wire with very different properties. trays, hot water boilers, etc.), or can be purchased as a component to be used in a customer specific Resistance Temperature Detectors (RTD): An application (e.g. plastics injection molding RTD is based on the fact that the electrical process). Listed below are examples of resistance of a metal changes as its products and applications that use temperature temperature changes. The resistance will rise switches. Many of these products and more or less linearly with temperature. RTDs applications may already use non-mercury use a length of conductor (platinum, nickel, temperature switches. iron or copper) wound around an insulator. Newer styles use a thin film of the conductor Ovens, sterilizers, moulding machines, heat deposited on a ceramic substrate. RTDs are exchangers, labelling machines, water baths, stable and have a fairly wide temperature heat sealers, refrigerating equipment, range, but are not as rugged and inexpensive ventilating equipment, alarm systems, as thermocouples. Since they require the use bearings, gear reducers, bucket elevators, of electric current to make measurements, hammer mills, generators, conveyors, dryer RTDs are subject to inaccuracies from self- bearings, mechanical drives, grinders, pumps, heating. motors, presses, mixers, appliances, vending Thermistor: A thermistor is also based on the machines, platens, plastic laminating presses, fact that the electrical resistance of a material dental equipment, popcorn machines, hot stamping, food warming trays, hydraulic changes as its temperature changes. Thermistors rely on the resistance change in a laminating presses, livestock applications, hot ceramic semiconductor, with the resistance water boilers, hot water storage tanks, heavy dropping non-linearly with a temperature rise. oil pre-heaters, watering fountains, label Thermistors tend to be more accurate than adhesive applicators, paint drying equipment, typesetting machines, hot stamp printers, RTDs and thermocouples, but they have a much more limited temperature range vending machines, deep fat cookers, and because of their marked non-linearity. textiles. Thermistors can be a low cost solution to temperature measurement. They tend to have There are numerous design parameters that affect the specification and selection of a large signal outputs and their small size permits fast response to temperature changes. temperature switch for a particular product or application. Temperature switch basic design Integrated Circuit Sensor: The newest type and product options vary greatly by of temperature sensor on the market is the manufacturer. The design requirements have a integrated circuit temperature transducer. significant impact on technology selection, Integrated circuit sensors can be designed to manufacturer selection, product model selection, produce either voltage or current output and product option selection, and ultimate product are extremely linear. Integrated circuit cost. For example, sensor selection is a key sensors are a very effective way to produce determinant of range, sensitivity, accuracy, life an analog voltage proportional to expectancy, and cost of a temperature switch. temperature. They have a limited temperature The following is a concise listing of some of the range and are used to measure temperatures more critical design parameters: from -50° to 300° F.

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· Operating parameters: Set-point, dead- band, factory set, field adjustable · Environmental conditions: shock, vibration, explosion, corrosiveness, · Enclosure: general purpose, weather temperature, humidity, RFI, etc. resistant, explosion proof, etc. · Other: temperature surge protection, test · Regulatory approval: Underwriters button, reset button, etc. Laboratories, Canadian Standards Association, etc.

· Switch type: mercury, snap switch, Mercury Temperature Switches micro-switch, transistor, etc. Description · Switch: number of poles, number of The temperature switch employs a temperature throws, amperage, voltage, hermetically responsive sensor, which is coupled to the sealed, etc. mechanical means of actuating a mercury switch. The temperature responsive sensor is typically · Load: resistive, inductive, other either a thermocouple, resistance temperature detector (RTD), or gas actuated bourdon tube. · Accuracy: repeatability, calibration The mercury content reported by manufacturers requirements to IMERC for temperature switches was in the range of greater than 1,000 mg. · Monitoring: local, remote Cost · Mounting: vertical, horizontal The cost of a mercury temperature switch is approximately $150 to $250 depending on · Materials: enclosure, sensor, switch, etc. product or application requirements. For one manufacturer, the cost of a temperature switch · Visual display: status, power on, etc. with a snap action switch is less than the cost of a mercury temperature switch with the same · Sensor type: RTD, integrated circuit, functionality. thermistor, thermocouple, etc. Advantages/Disadvantages · Temperature: range to be measured, The mercury temperature switch has high maximum operating temperature, storage reliability and long operational life because it has temperature, etc. few components and is not subject to arcing. Life cycle testing has been successfully · Life expectancy: time in service, number conducted for more than one million cycles. The of cycles mercury temperature switch can handle a high inductive load, has a quiet operation, has no bounce on contact, and can be hermetically · Electrical connection: terminal block, conduit, etc. sealed to provide increased protection from various environmental factors.

The mercury temperature switch contains · Physical: size, weight, etc. mercury, which is becoming less desirable for many applications including the food and · Power input: 120/240VAC, 12/24VDC, beverage industry. current, etc.

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Manufacturers Manufacturer Product Phone Number The following table lists a manufacturer of Name & Website mercury temperature switches. Barksdale, Inc. THR, TPR, 800-835-1060 T1X, L1X www.barksdale.c

Series om Manufacturer Product Phone Number &

Name Website Chromalox AR, ARR, and 800-443-2640 Dwyer M-51, FM, 219-879-8000 3000 Series www.chromolox. Instruments DA-36, DA- www.dwyer- com (Mercoid) 37 Series inst.com

Custom 6900 and 604 818-341-4610

Control Series www.ccsdualsna Sensors, Inc. p.com

Dwyer RRT, D-7435, 219-879-8000 Alternative 1: Mechanical Temperature Instruments DA-36, and www.dwyer- Switches (Mercoid) DA-37 Series inst.com

Description Kidde-Fenwal, Series 15000, 508-881-2000 Inc. 16000, 17000, www.fenwalcont The mechanical temperature switch employs a and 18000 rols.com temperature responsive sensor, which is coupled to the mechanical means of actuating a Kobold TWR and TRS 800-998-1020 mechanical switch. The temperature responsive Series www.kobold.co sensor can typically be a thermocouple, bulb and m capillary, resistance temperature detector (RTD), Neo-dyn/ITT Series 100T 661-295-4000 welded alloy, or gas actuated bourdon tube. Industries and 132T www.neodyn,co m Cost The cost of a mechanical temperature switch is Selco S200 and SIO 800-257-3526 approximately $8 to $600 depending on product Series www.selcoprodu cts.com or application requirements. For one manufacturer, the cost of a temperature switch United Electric 55 Series 617-926-1000 with a snap action switch is less than the cost of a Controls www.ueonline.c mercury temperature switch with the same C54S-103 om functionality. B54-103 Weed Model PR7 800-880-9333 Advantages/Disadvantages Instrument Series www.weedinstru The mechanical temperature switch has high ment.com reliability, long operational life, and can handle high inductive loads. The reliability and accuracy of a mechanical temperature switch is largely dependent on the sensor technology used. The mechanical temperature switch provides Alternative 2: Solid State Temperature similar functionality to the mercury temperature Switches switch without the attendant mercury management issues. Description The solid-state temperature switch utilizes Manufacturers temperature coefficient thermistors, RTDs, or The following are manufacturers of mechanical integrated circuits sensor to monitor temperature, temperature switches: and a semiconductor for the switching output.

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Cost products and applications. However, these non- The cost of a solid-state temperature switch is mercury alternatives may not meet the approximately $350 to $600 depending on requirements for retrofitting all existing product or application requirements. The cost of temperature switch products and applications. a solid-state temperature switch is generally higher than the cost of a mercury or mechanical temperature switch. 4.16 Relays Advantages/Disadvantages The use of solid-state technology provides A relay is an electrically controlled device that improved accuracy, repeatability, and reliability opens or closes electrical contacts to effect the as compared with mechanical or mercury operation of other devices in the same or another temperature switches. Switching point, electrical circuit. Relays are often used to switch hysteresis, and other parameters are often field large current loads by supplying relatively small programmable. Solid-state temperature switches currents to a control circuit. There are two provide tighter control that can increase the life general families of relays: electro-mechanical of controlled equipment. Solid-state temperature and semiconductor. Electro-mechanical relays switches operate with low voltage and low include mercury displacement, mercury wetted current consumption. Solid-state temperature reed relay, mercury contact relay, dry reed relay, switches do not require calibration. and other miscellaneous electro-mechanical Solid-state temperature switches usually have relays. Semiconductor relays include solid-state a higher initial cost than mechanical or mercury relays and silicon controlled rectifiers. temperature switches. A relay is a versatile component used to meet the needs of hundreds of varied products and Manufacturers applications. A relay can be incorporated into a The following are manufacturers of solid-state product (e.g. copiers, heaters, conveyors, etc.), or temperature switches: can be purchased as a component to be used in a customer specific application (e.g. petrochemical Manufacturer Product Phone Number & processing). Listed below are examples of Name Website Kobold TDD – 2, 800-998-1020 products and applications that use relays. Many TDD - 4 www.kobold.com of these products and applications may already use non-mercury relays. Maxitronic HB Series 800-659-8520 · Commercial aircraft: power control, www.maxitronic.com master power switches, motor control

Seiko S-8130AC 310-517-7771 switching, heavy current load switching, Instruments Series www.seiko-usa- instrument panel, generator switching, USA ecd.com alternator power switching, antenna changeover, channel selection, etc. United Electric D1C2L1N, 617-926-1000 Controls D1C2L2A, www.ueonline.com D1A2L1N · Air conditioning and heating equipment: compressor motors, fan motors, coolant Summary pump motors, duct heaters, etc. There are numerous non-mercury alternative technologies currently in use for temperature · Lighting controls: street lamps, dimmer switch products and applications. It appears that controls, parking lots, scoreboards, high these non-mercury alternatives are cost intensity lamps, traffic signals, tungsten competitive and can meet the functional lamps, etc. requirements for new temperature switch

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· Telecommunications: trunk switching, operated machines, ships, laboratory test panels, telecomm circuit boards, load baths, flask heaters, robotics, packaging switches, radio base stations, ground start, machines, pharmaceutical processes, input/output cards, control panel textiles, paper & pulp drying, infrared exchanges, antenna switches, loop current ovens, high temperature materials test, etc. processing, electric ranges, multiplexers, communication modules, modems, data · Hospitals: surgical equipment, X-ray access arrangement circuits, etc. machine control, energy management systems, surgical lighting, etc. The global market for relays was $4.658 billion in 2001 revenues. Approximately 89.1% · Food Industry: food processing, deep of these revenues were for electromechanical fryers, pizza ovens, baking ovens, electric relays and 10.9% was for semiconductor relays. grills, dishwashers, etc. The three largest industry applications were telecommunications (25.3%), transportation · Office equipment: copiers, computer (18.4%), and industrial automation (12.4%). power supplies, blue print machines, etc. There are numerous design parameters that affect the specification and selection of a relay · Manufacturing: injection molding for a particular application. The following is a machines, kilns, ink heating, vacuum concise listing of some of the more critical forming, soldering systems, factors: semiconductor processing, programmable logic controllers, etc. · Mounting: printed circuit board, din rail, bracket/flange mount, socket/plug-in · Production test equipment: component style, surface mount, etc. testers, cable testers, circuit testing, etc. · Reliability: failure rate, mean cycles · Laboratory test instruments: voltmeters, before failure (MCBF), etc. ohmmeters, recorders, environmental chambers, etc. · Enclosure: open, National Electrical Manufacturers Association (NEMA), · Machine tool control: solenoid operated hermetically sealed, etc. valves, heavy motor starting, signal lights, etc. · Pole specifications: single pole, double pole, triple pole, etc. · Miscellaneous: mining equipment, pool heaters, dry cleaning equipment, · Throw specifications: single throw, notebook computers, ceramic heaters, double throw, etc. industrial furnaces, alarm systems, battery chargers, farm incubators, chemical tank · Isolation: optically isolated, etc. heaters, film packaging, glass furnaces, engraving equipment, plastic extruders, · Contact ratings: maximum switching steam generators, automobiles, printing current (amps), maximum switching machines, silicon carbide heaters, voltage, maximum switching power controlled rectifiers, graphite heaters, infrared dryers, book binding machines, · Contacts: normally open, normally trucks, conveyors, appliances, missiles, closed, contact material, etc. aerospace, petrochemical processing, coin

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· Materials: contacts, insulation, soldering Original equipment manufacturers that use fluxes, finishes, etc. relays as a component within their products or equipment were interviewed by Venture · Regulatory approval: Underwriters Development Corporation. They were asked to Laboratories, Canadian Standards identify the most important criterion for their Association, etc. selection of relays in their products. The following table illustrates the results: · Resistance: contacts, coil, insulation Table 4.6: Most Important Relay Product Selection Criteria · Voltage: Direct current or alternating

current Product Selection Criteria Percent of OEM Respondents · Load types: inductive, motor, lamp, etc. Citing as Most Important · Load characteristics: inrush current, step Reliability/Quality/Durability 41.4% Contact Current Specifications 27.6% up, ramp up, soft start, etc. Physical Characteristics 27.6% Lifespan/Cycles 24.1% · Life expectancy: electrical components, Coil/Control Specifications 19.0% mechanical components, controlled Resistance Parameters 15.5% equipment, etc. Ease of Maintenance & 13.8% Replacement Isolation Parameters 15.5% · Physical: weight, size, noise level, etc. Regulatory/Customer 10.3% Requirements · Coil ratings: voltage range, resistance Energy Efficiency 3.4% range, nominal power, etc. Other 12.1% Source: Venture Development Corporation

· Performance specifications: make/operate time, break/release time, contact chatter, contact bounce, time delay, etc. 4.16.A Mercury Displacement Relay Description · Environment: operating temperature, The mercury displacement relay uses a metallic shock, vibration, acceleration, humidity, plunger device to displace mercury. The plunger etc. is lighter than mercury so it floats on the mercury. The plunger also contains a magnetic · Control panel: space available, natural shell or sleeve, so it can be pulled down into the convection available, etc. mercury with a magnetic field. The plunger provides the same functionality in a mercury · Output device for solid-state relays: displacement relay as an armature in a metal oxide semiconductor field effect mechanical relay. When the coil power is off, transistor (MOSFET), silicon controlled the mercury level is below the electrode tip and rectifier, bipolar transistor, triac, etc. no current path exists between the insulated center electrode and the mercury pool. When · Other features: time delay, instrinsically coil power is applied the plunger is drawn down safe, visual indicators, sealed enclosure, into the mercury pool by the pull of the magnetic test button, latching controls, energy field and the plunger centers itself within the efficiency, etc. current path. Upon removing the coil power, the buoyancy force of the mercury causes the plunger assembly to again rise to the starting

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position. This drops the level of the mercury and pivots, hinges, pins or mechanical linkages breaks the current path through the center resulting in limited wear. Mercury displacement electrode and the mercury pool. relays last on average between 1,000,000 to The amount of mercury in mercury 10,000,000 cycles. Factors that affect the displacement relays varies considerably based on longevity of the relay include: voltage being number of poles, current rating, termination switched, ratio of line voltage to rated voltage, requirements, and other factors. The mercury and number of cycles per hour. Mercury content reported by manufacturers to IMERC for displacement relays have bounce free operation relays was in the range of greater than 1,000 mg. because the mercury surface tension enable the The mercury can be released to the environment mercury to bridge the contacts during the plunger during product use. For example, if the load is settling time. short circuited, the MDR can burst. Some Mercury displacement relays need to be manufacturers offer free take-back programs for mounted in a specific orientation in order for the their mercury relays. mercury to function properly. Mercury Mercury displacement relays are used in high displacement relays can burst, causing an on-site current, high voltage applications such as hazardous waste problem, if the relay is industrial process controllers, power supply overheated due to rapid cycling or if the load is switching, resistance heating, tungsten lighting, short-circuited. In addition, disposal of worn out welding, high current/voltage lighting, flood contactors can be expensive. Control of lights, copiers, battery chargers, energy equipment is limited compared with solid-state management systems, and industrial ovens. relays. Thermal shock can occur for the equipment being controlled by the relay. Cost The cost of a mercury displacement relay is Manufacturers approximately $20 to $150 depending on product The following are manufacturers of mercury or application requirements. The cost of a displacement relays: mercury displacement relay is comparable with other electromechanical relays. The cost of a mercury displacement relay is less than a solid Manufacturer Product Phone Number & Name Website state relay for low current applications, but cost Chromalox HGR 800-443-2640 becomes comparable for higher current series www.chromolox.com applications. Magnecraft & WM and 843-393-5778 Advantages/Disadvantages Struthers-Dunn WML www.magnecraft.com Series Mercury displacement relays have hermetically sealed contacts that provide internal and external Mercury Numerous 616-663-8574 protection from arcing and environmental abuse. Displacement models www.mdius.com The mercury rewets the contact electrode Industries Inc. providing a new contact surface with each Watlow Electronic HG Series 507-454-5300 actuation, so the surface does not pit or weld. Manufacturing www.watlow.com Company Mercury displacement relays can cycle faster than a mechanical relay, and have low contact resistance because large electrodes and surrounding mercury volume creates large 4.16.B Mercury Wetted Reed Relay contact mating areas. Mercury displacement Description relays have quiet operation because acoustical A mercury wetted reed relay is a type of electro- noise from rebounding contacts is eliminated. mechanical relay that employs a hermetically Mercury displacement relays have long life sealed reed switch. The reeds are thin flat because they contain one moving part and no

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ferromagnetic blades that serve as a contact, between the logic and input and output devices is spring, and magnetic armature. The mercury less complicated and less expensive for reed wetted reed relay consists of a glass encapsulated relays. The mercury wetted reed relay has the reed with its base immersed in a pool of mercury following advantages over a dry reed relay: no and the other end capable of moving between two contact bounce, longer life, and lower contact sets of contacts. The mercury flows up the reed resistance. by capillary action and wets the contact surface Reed relays used for inductive loads such as of the reed and the stationary contacts. The motors, relay coil, solenoids, etc., are subject to mercury wetted reed relay is usually actuated by high induced voltages during opening of the load a coil around the capsule. circuit contacts. This high transient voltage may Wetted mercury reed relays are typically cause damage to the reed switch or significantly small circuit controls that are used in electronic reduce its life. Reed relays used for capacitive devices for switching or signal routing functions. loads such as capacitors, incandescent lamps or Reed relays are primarily used in test, calibration, long cables, are subject to high surge/inrush and measurement equipment applications where current. Therefore, protective circuits such as stable contact resistance over the life of the surge suppressors or current limiting resistors are product is necessary. often used. Reed relays located near sources of strong magnetic interference such as steel plates, Cost transformers, etc. can experience changes in Prices for the mercury wetted reed relay ranged operational characteristics and false operation is from approximately $10 for printed circuit board likely. The wetted mercury reed relay must be mounted low amperage devices, to $40 for larger mounted in the vertical position for proper 5 amp devices. For one manufacturer, the cost of operation. mercury wetted relay was the same as a dry Mercury wetted reed relays can be replaced by magnetic reed relay for a similar device. For dry reed magnetic relays for most applications another manufacturer, the cost of a mercury with the exception of applications that require no wetted relay was double the cost of a dry contact bounce, long operational life, or low magnetic reed relay for a similar device. Overall, contact resistance. prices for mercury wetted relays appear to be comparable to prices for dry reed relays. Manufacturers However, life cycle costs are higher for the The following are manufacturers of mercury mercury wetted reed relay due to the higher costs wetted reed relays: associated with shipping, management, and disposal of the mercury containing device. Manufac turer Product Phone Number & Name Website American Numerous 562-944-0447 Advantages/Disadvantages Relays, Inc. DIP, SIP, www.americanrela Hermetically sealed contacts in a clean and ys.com atmosphere are unaffected by dust, corrosion, or encapsulated oxidation, and also eliminate the opportunity for , models sticking, binding, or wearing of hinged joints. Celduc Relais F81A, Laube Technology: With proper circuitry, magnetic reed relays can (France) F72C2 805-388-1050 offer a life span in excess of one billion Laube Series www.celduc- operations. The mercury wetted reed relay can Technology – relais.com operate in the millisecond range. Although US slower than solid-state relays, reed relays are Representative Computer Numerous 800-864-2815 sufficiently faster than other electro-mechanical Components, models www.relays- relays and therefore can be used in high speed Inc. unlimited.com switching applications. When compared to solid- state relays, the necessary coupling circuitry

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Manufac turer Product Phone Number & usually plated with rhodium, ruthenium, or gold Name Website to provide a low contact resistance when they Crydom DIP Series Crydom USA meet. Magnetics 619-210-1600 (UK) www.crydom.co.uk Dry magnetic reed relays are typically small circuit controls that are used in electronic Meder MRE and 800-870-5385 devices. Reed relays are primarily used in test, Electronic, MT Series www.meder.com calibration, and measurement equipment Inc. applications where stable contact resistance over SRC Devices MSS Series, 858-292-8770 HGWM www.srcdevices.co the life of the product is necessary. Series m Cost The cost of dry magnetic reed relays are approximately $2 to $15 depending on product or 4.16.C Mercury Contact Relay application requirements. For one manufacturer, the cost of mercury wetted relay was the same as Description a dry magnetic reed relay for a similar device. The mercury contact relay establishes contact For another manufacturer, the cost of mercury between electrodes in a sealed capsule as a result wetted relay was double the cost for a dry of the capsule being tilted by an electro- magnetic reed relay for a similar device. magnetically actuated armature, either on pickup or dropout. No manufacturers were identified Advantages/Disadvantages that currently produce this type of mercury relay, The dry magnetic reed relay has long operational and therefore there will be no further coverage of life, fast cycling time, no mercury life cycle this type of relay in this report. impacts to address, and can be mounted in any position for proper operation. The dry magnetic reed relay experiences similar effects from electromagnetic interference Alternative 1: Dry Magnetic Reed as the mercury wetted reed relay. Exposure to Relay high voltage may cause the contacts to weld together. The dry magnetic reed relay has more Description contact bounce than mercury wetted reed relays, A dry magnetic reed relays consists of a pair of shorter operational life than mercury wetted reed low reluctance, ferromagnetic, slender flattened relays, and has higher contact resistance than the reeds. These reeds are hermetically sealed into a mercury wetted relay. glass tube with a controlled atmosphere in cantilever fashion so that the ends align and Manufacturers overlap with a small air gap. Since the reeds are The following are manufacturers of dry magnetic ferromagnetic, the extreme ends will assume reed relays: opposite magnetic polarity when brought into the influence of a magnetic field. When the magnetic Manufacturer Product Phone Number & flux density is sufficient, the attraction force of Name Website American Numerous 562-944-0447 the opposing magnetic poles overcomes the reed Relays, Inc. models www.americanrelays stiffness causing them to flex toward each other .com and make contact. This operation can be repeated millions of times at extremely high speeds. Celduc Relais D31 and Laube Technology: Energizing the coil sets up a magnetic field that (France) D41 805-388-1050 Laube Series www.celduc- acts in the same manner as the permanent Technology – relais.com magnet. At the contact area, these relays are US Representative

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Manufacturer Product Phone Number & requirement goes up, the price for other electro- Name Website mechanical relays rises and they become less cost Computer Numerous 800-864-2815 competitive with solid-state relays. Components, models www.relays- Inc. unlimited.com Advantages/Disadvantages Coto Numerous 401-943-2686 Other electro-mechanical relays are often used as Technology models www.cotorelay.com safety devices because of the complete mechanical break in the electrical circuit, Crydom S Series Crydom USA Magnetics 619-210-1600 whereas solid-state units are subject to leakage (UK) www.crydom.co.uk current. Other electro-mechanical relays are often selected because of their low initial cost. Magnecraft & W107 843-393-5778 Electromechanical relays are desirable when Struthers- Series www.magnecraft.co electrical interference is likely to be present or Dunn m when low heat dissipation is required.

Meder H, LI, HE, 800-870-5385 Other electro-mechanical relays will typically Electronic, MRX, MT www.meder.com wear out either mechanically or electrically Inc. and other within several hundreds of thousands of cycles. series This is a shorter operational life than for either NTE R56 973-748-5089 mercury or solid-state relays. Labor costs and Electronics, Series www.nteinc.com Inc. production down time to change a failure are SRC Devices Series 858-292-8770 significant when selecting this type of relay for DSS4 and www.srcdevices.com high cycling applications. Other electro- PRMA mechanical relays also have a slow cycle time. Therefore, the control of equipment is poor for many sensitive applications. The controlled equipment may be damaged and heater life can Alternative 2: Other Electro- be shortened due to thermal shock. Mechanical Relays Manufacturers Description The following are manufacturers of other electro- There are several classifications of electro- mechanical relays: mechanical relays including mercury displacement, mercury wetted reed, dry reed, and Manufacturer Product Phone Number & Name Website other electro-mechanical relays. This section Chromalox CONT 800-443-2640 will focus on the other electro-mechanical relays Series www.chromolox.co that include general purpose, definite purpose, m heavy duty, and printed circuit board mounted relays. Most electromechanical relays are driven Computer Numerous 800-864-2815 Components, models www.relays- electro-magnetically, by passing a current Inc. unlimited.com through a coil and generating a magnetic flux. This flux then causes an armature to move Magnecraft & W199 843-393-5778 prompting isolated electrical contacts to open or Struthers- Series www.magnecraft.co close. Dunn m

Meder TC Series 800-870-5385 Cost Electronic, www.meder.com The cost for other electro-mechanical relays is Inc. approximately $1 to $35 depending upon product NTE R10 973-748-5089 or application requirements. As the power level Electronics, Series www.nteinc.com Inc.

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Manufacturer Product Phone Number & Solid-state relays experience voltage drops Name Website across the device resulting in heat generation. Omron MJN and 847-882-2288 The more current put through the device, the Electronics MGN www.omron.com Series greater the quantity of heat that needs to be SRC Devices LM Series 858-292-8770 dissipated. Overheating protection is usually www.srcdevices.com provided by heat sinks or cooling fans. Solid- state relays require proper fusing for short circuit Teledyne Numerous 800-284-7007 protection. Solid-state relays also may require models www.teledynerelays. com protection from transient voltage spikes. This is usually provided by metal oxide varistors. Solid- state relays only turn circuits on or off, resulting in controlled equipment receiving either full current or no current. Some solid-state relay manufacturers use infrared light emitting diodes Alternative 3: Solid State Relay (LEDs) made of gallium/aluminum/arsenic to control the optically coupled input. The solid- Description state relay experiences current leakages, and the A solid-state relay is a semiconductor, electronic contact resistance is typically higher than switching device that operates a load circuit mercury wetted relays. without the use of physical mechanical contacts.

The solid-state relay contains an input circuit, an Manufacturers opto-coupler chip, and an output circuit designed The following are manufacturers of solid-state to switch either an alternating current or direct relays: current voltage. Solid state relays control power by switching on and off at the zero cross point. Manufacturer Product Phone Number & Cost Name Website The cost of a solid-state relay is approximately ABB SSAC Numerous 315-638-1300 $1 to $150 depending on product or application models www.ssac.com requirements. Carlo Gavazzi RN and Allied: (Switzerland) RS1A Series 800-433-5700 Advantages/Disadvantages U.S. Rep - www.carlogavazzi. Solid state relays provide the following Allied com advantages: very long operational life, immunity Celduc Relais SC Series Laube Technology: to electromagnetic interference, lower power (France) 805-388-1050 consumption, high operating speeds, bounce-free Laube www.celduc- operation, low level control signals, small Technology – relais.com package size, and multi function integration. The US printed circuit board mounted solid-state relay Representative has a tremendous size advantage over the Chromalox 7750 Series 800-443-2640 www.chromolox.c electromagnetic relay, resulting in critical printed om circuit board space savings. The solid-state relay is also more immune to physical shock, vibration, Clare CPC, LCA 978-524-6700 and damage. Solid-state relay operational testing Series www.clare.com by one manufacturer resulted in a mean time Computer Numerous 800-864-2815 between failure (MTBF) of thirty-three years. Components, models www.relays- Compared to the dry reed relay, the solid-state Inc. unlimited.com relay has no contact bounce, and longer operational life.

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Manufacturer Product Phone Number & · Phase-angle-fired controls – Provides Name Website smooth, variable application of power to Continental SV, RS, and 703-669-1306 Industries Inc. RV Series www.ciicontrols.co heaters. m · Zero-voltage switching controls – Crouzet 84132 and 972-471-2555 Proportionally turns on and off each full Corporation 84130 Series www.crouzet.com cycle of the power line.

Crydom H12 Series Crydom USA Magnetics 619-210-1600 · On/off controls – Function similar to (UK) www.crydom.co.uk electro-mechanical or mercury relays, but has much faster cycle times. International PV Series 310-322-3331 Rectifier www.irf.com Cost NTE RS1 and 973-748-5089 The cost of a silicon controlled rectifier is Electronics, RS3 Series www.nteinc.com approximately $30 to $150 depending on product Inc. or application requirements. The cost of silicon Solid State Numerous 888-377-4776 controlled rectifiers is higher than electro- Optronics, Inc. models www.ssousa.com mechanical relays at low power, but becomes

Teledyne C3P24D25 800-284-7007 more comparable with electromechanical relays Model www.teledynerelay at mid to high power levels. s.com Advantages/Disadvantages Tyco SSRD, 800-468-2023 The silicon controlled rectifier is an extremely Electronics SSRQ, and www.relay.tycoele SSRT Series ctronics.com fast switch that can be cycled in milliseconds. Silicon controlled rectifiers offer the following Vishay LH Series 402-563-6866 advantages: improved response time, closer www.vishay.com process control, extended life of controlled equipment, reduced maintenance costs, silent Watlow SSR Series 507-454-5300 operation, and reduced peak power consumption. Electronic www.watlow.com Manufacturing The level of process control that can be achieved Company with a silicon controlled rectifiers is unattainable with any other relay type. Silicon controlled rectifiers are excellent for addressing high inrush current, soft start, step up, ramp up, or other Alternative 4: Silicon Controlled applications where variable power is required and Rectifiers satisfied by using phase angle functionality. The silicon controlled rectifier needs to be

Description physically disconnected before servicing The silicon controlled rectifier functions as a controlled equipment, and has heat dissipation switch that can rapidly turn power on or off in a requirements. The silicon controlled rectifier variety of applications. The silicon controlled costs more than other relays for low current rectifier is made up of four layers of applications. semiconductor material. Silicon controlled rectifiers can deliver electrical power to Manufacturers controlled equipment in several ways: The following are manufacturers of silicon controlled rectifiers:

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Manufacturer Product Phone Number & relay slightly less than its mercury displacement Name Website relay with comparable functionality. Avatar A1P, A3P, 610-543-5155 Instruments B, C1P, D, www.avatarinstrum CZ, and R ents.com Advantages/Disadvantages Series By combining solid state and electromechanical Carlo Gavazzi RM1A and Allied: relay technology, the hybrid relay eliminates the (Switzerland) RE Series 800-433-5700 internal heating effect caused by current flow U.S. Rep - www.carlogavazzi. through electronic power components. This Allied com eliminates the need for integrated heat sinks and Chromalox 4001 SCR 800-443-2640 consequently reduces the physical size of the Series www.chromolox.c relay. The hybrid relay provides a long om operation life, often greater than five million cycles. The hybrid relay has a virtually silent Tyco SSR Series 800-468-2023 operation, enabling the relay to be mounted in Electronics www.relay.tycoele ctronics.com noise sensitive areas. A wide range of hybrid relays is not currently Watlow DIN-A- 507-454-5300 available to meet all design parameters. Electronic MITE Series www.watlow.com However, the hybrid relay is a good alternative Manufacturing for retrofitting mercury relays when the hybrid Company relay can cover the necessary design parameters. Manufacturers The following are manufacturers of hybrid Alternative 5: Hybrid (Electro- relays: mechanical and Solid-State) Manufacturer Product Phone Number & Name Website Description Carlo Gavazzi RZ Series Allied: Hybrid relays combine electromechanical and (Switzerland) 800-433-5700 solid-state technologies, offering the advantages U.S. Rep - www.carlogavazzi.com Allied of both without the disadvantages associated with Crouzet 84138 972-471-2555 either individually. The switching of a hybrid Corporation Series www.crouzet.com relay is controlled by a microprocessor. When switched on, the circuit is closed by the solid- Watlow E-Safe 507-454-5300 state element and the load energized, while Electronic Relay www.watlow.com Manufacturing absorbing transient peaks. The solid-state Company element is then short-circuited a few milliseconds later by an electromechanical relay contact, Summary which maintains the load. The reverse cycle There are numerous non-mercury alternative operates when the control signal disappears and technologies currently in use for relay products the circuit is de-energized. The hybrid power and applications. The non-mercury alternatives relay is designed to cycle power on and off for a have been designed for use in various variety of applications including heating, applications, including demanding process ventilation, air conditioning and lighting. control applications in industries such as food, glass, plastics, semiconductors, chemical, and Cost petroleum. It appears that these non-mercury The cost of a hybrid relay is approximately $40 alternatives are cost competitive and can meet the to $140 depending on product or application functional requirements for most, but not all new requirements. One manufacturer prices its hybrid relay products and applications. In addition, these non-mercury alternatives may not meet the

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requirements for retrofitting existing relay Manufacturers products and applications in some circumstances. The following are manufacturers of mercury flame sensors:

4.17 Flame Sensor Manufacturer Product Phone Number Name & Website Andy Baumen Mercury 1-800-387-817 Mercury Flame Sensor Associates, Flame Sensor www.andybaum Ltd. enltd.com Description Channel Mercury 440-423-0113 Flame sensors are used as a safety device in gas Products Inc. Flame Sensor appliances. The flames sensor will stop the flow of gas if there is no heat being produced by an White-Rodgers Mercury 314-577-1300 open flame meaning the pilot light is out, or the Flame Sensor www.white- product is malfunctioning. The mercury within rodgers.com the bulb of the sensor vaporizes and expands Fenwal Mercury 508-881-2000 when the pilot light is on causing the gas valve to Flame Sensor www.fenwalcont open. rols.com

Cost Derlite Mercury 44-1208-72565 The difference in cost of flame sensors as a Limited Flame Sensor www.derlite.com component is difficult to find. One cost Harper- Mercury 630-870-3300 comparison made was between gas ranges that Wyman Co. Flame Sensor www.harper- contain a mercury flame sensor and those that wyman.com have an electronic ignition system. The prices Invensys Mercury 804-756-6524 were comparable ranging from $300 up to $1000. Appliance Flame Sensor www.invensys.c Controls om A low-end quality name gas range with an electronic ignition and a gas range with a Major Mercury 847-593-0796 mercury flame sensor were both around $300. International Flame Sensor www.majorinter The leading manufacturer of mobile home national.com products also offers an electronic ignition system Sit La Precisa Mercury +39-049- in its ranges and hot water heaters. No cost S.p.A. Flame Sensor 8293111 www.sitgroup.it difference was noted in any product literature, and almost every model manufactured was offered either as electronic ignition flame detection or a mercury flame sensor. Alternative 1: Electronic Ignition

Advantages/Disadvantages System The mercury flame sensor provides the safety of controlling the flow of gas when no flame is lit. Description This prevents natural gas from leaking out and Using an electronic ignition system in gas creating a serious situation. A majority of the appliances eliminates the need for a standing manufacturers identified offered an electronic pilot light. The electronic ignition sparks when ignition flame detection unit that does not use the gas is turned on to ensure rapid lighting of mercury in its sensor. gas and to prevent gas discharge before sparking.

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Cost Manufacturer Product Phone Number In general, the difference in cost between a range Name & Website with an electronic ignition and the cost of a range Trivar Inc. Electronic 905-671-1744 Flame Sensor www.trivar.com with a mercury flame sensor is negligible. Steelman Electronic 903-984-3061 However, one manufacturer indicated that the Industries, Inc. Flame Sensor www.steelman.c price of their electronic ignition range was 10% - om 20% higher than the price of their pilot model Capable Electronic 630-860-6514 range containing a mercury flame sensor. A low Controls Flame Sensor end quality name gas range with an electronic Derlite Electronic 44-1208-72565 ignition starts at $300 and can run up to $1000. Limited Flame Sensor www.derlite.com A majority of the manufacturers identified offered an electronic ignition flame detection unit Harper- Electronic 630-870-3300 that does not use mercury in its sensor. Wyman Co. Flame Sensor www.harper- The leading manufacturer of mobile home wyman.com Invensys Electronic 804-756-6524 products also offers an electronic ignition system Appliance Flame Sensor www.invensys.c in its ranges and hot water heaters. No cost Controls om difference was noted in any product literature, and almost every model manufactured was Johnson Electronic 414-524-1200 offered either as electronic ignition flame Controls Flame Sensor www.johnsonco detection or a mercury flame sensor. ntrols.com Major Electronic 847-593-0796 International Flame Sensor www.majorinter Advantages/Disadvantages national.com One key concern when using an electronic Sit La Precisa Electronic +39-049- ignition gas product is the fact that electricity S.p.A. Flame Sensor 8293111 must be present in order to light the appliance. In www.sitgroup.it remote areas where electricity is not offered safety becomes a concern. The electronic Summary ignition flame detection products can still be lit The electric ignition system is a cost effective without electricity, but offer no safety to control and functional replacement for the mercury flame the gas flow. The mercury flame sensors do not sensor. Electronic ignition systems are currently require electricity to function, but ensure the in use for many applications. In remote areas detection of a flame and the control of gas flow. where electricity is intermittent or unavailable, The electronic ignition system ranges do not the electronic ignition system is not a safe contain any mercury containing devices or alternative to the mercury flame sensor. Even sensors, and are a good alternative. when electricity is available, the mercury flame sensor cannot always be easily retrofitted with an electronic ignition system for existing Manufacturers applications because the flame sensor is often The following are manufacturers of electronic highly integrated within a product. ignition systems:

Manufacturer Product Phone Number Name & Website Andy Baumen Electronic 1-800-387-817 Associates, Flame Sensor www.andybaum Ltd. enltd.com

Ventronics, Electronic 908-272-9262 Inc. Flame Sensor www.ventronicsi nc.com

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and other types of measuring instruments. Some 5.0 Conclusions and exemptions remain for spare parts of existing products and applications. Other European Recommendations countries have banned or restricted the import, sale, and/or use of various mercury containing 5.1 Conclusions products. (UNEP, 2002) In the United States, there is legislation at the state level to address the sale of various mercury Researching alternatives to the priority containing products. For example, Rhode Island mercury added products showed that many of and Connecticut have recently adopted into law these mercury-containing products can be mercury product phase-out legislation based on replaced with non-mercury products of equal or the NEWMOA Mercury Model Legislation. greater functionality at comparable costs.

For most priority products examined in this Sphygmomanometers study, at least one manufacturer of the non- Alternatives to mercury sphygmomanometers are mercury alternative was identified where the cost available from a number of manufacturers. The differences between mercury and non-mercury basic function and purchase price of the aneroid technologies were minimal. The research (dial) sphygmomanometer appear to be findings suggest that many non-mercury comparable to that of the mercury alternatives are available to address the full range sphygmomanometer. A relatively new class of of functions required by consumer products. electronic blood pressure monitors is also now Examples of some product specific mercury available. This type of device, with an entry level replacement programs were discussed in the price of approximately $700 (roughly five times findings section of this report. In addition, there the cost of the least expensive mercury gauge), is are mercury replacement programs that address promoted as being more forgiving of operator multiple mercury containing products. For technique and providing more comprehensive example, the Mercury Pollution Prevention information about blood pressure. Initiative involves three Indiana steel mills that are inventorying mercury containing products, Esophageal (Bougie) Tubes identifying non-mercury alternatives, and Tungsten gel-filled bougies are readily available replacing the mercury products with non-mercury from medical device manufacturers and appear to alternatives. Products included in this effort are be quite acceptable to practitioners. barometers, manometers, hydrometers, pyrometers, thermometers, thermostats, pressure Gastrointestinal Tubes switches, tilt switches, float switches, and relays. The research suggests that gastrointestinal tubes The inventory effort identified approximately one are not widely used and tubes seem to be thousand pounds of mercury in equipment and consistently sold empty of mercury. Thus, a devices at these three steel mills. The three mills facility electing to use these tubes would supply have committed to a reduction of 330 pounds of its own mercury for weighting. One manufacturer mercury in equipment by the end of 2000, a advised using sterile water for weighting, reduction of 660 pounds by the end of 2004, and although it may result in a longer time for the a reduction of 900 pounds by the end of 2008. medical procedure. (Delta Institute, 2001)

Legislation to address mercury containing Manometers products has been in existence since the early Mercury manometers can be replaced by digital 1990s. In 1993, Sweden banned or phased-out or vacuum gauge manometers. Both alternatives the manufacture, import, or sale of thermometers, are available and cost competitive. The digital barometers, manometers, tilt switches, float manometer is very accurate, and routine switches, pressure switches, thermostats, relays,

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calibration of the digital manometer will ensure Hydrometers its accuracy. The hydrometer has many different applications; its primary use is in the beer and wine making Basal thermometers industry. The use of a spirit filled hydrometer is Non-mercury basal thermometers are readily preferable because it is reliable and cost available and it appears that digital and liquid-in- competitive with the mercury hydrometer. glass alternatives would be functional and acceptable to consumers. The digital basal Flow Meters thermometers offer features that the mercury During this study, no manufacturers of mercury thermometers lack: easy-to-read digital display, flow meters were identified. The reliability of the beep upon achieving maximum temperature, and digital flow meters and other non-mercury flow memory functionality. One supplier offers a meters are of high caliber, and are in use in liquid-in-glass thermometer that is similar in numerous application. appearance and function to a mercury basal thermometer. Although non-mercury basal Pyrometers thermometers are slightly more expensive than During this study, no manufacturers of mercury the mercury counterpart (by a few dollars), this is pyrometers were identified. The alternatives to a an infrequent purchase and is in the same price mercury pyrometer (used mainly in foundries to range as some single-use fertility related products measure the temperature of extremely hot (e.g. over-the-counter pregnancy test kits). materials) include the digital pyrometer and the optical pyrometer. The optical pyrometer is Thermometers (other non-fever) manufactured for large industrial type foundries. Many viable alternatives exist to the mercury The digital pyrometer seems to be a much more thermometer for multiple applications. The economical choice than the optical pyrometer for alternatives to mercury thermometers are widely smaller foundries. available in the United States, have been in use and are considered to be comparable in accuracy Thermostats to mercury thermometers. The overall cost to Rugged industrial thermostats are made to switch from mercury to non-mercury is minimal. withstand extreme environmental conditions and are used in lieu of electronic thermostats where Barometers there is a risk of explosion. The manufacturers of Aneroid barometers can be manufactured with or digital thermostats indicated that they are not without mercury. Some digital barometers can designed for rugged industrial use, but can be perform other tasks, and therefore cost more. used in low-level industrial applications. In some The digital barometer can be very inexpensive if circumstances the mercury thermostat may be it is only needed to perform the task of measuring replaced with a digital thermostat. However, for atmospheric pressure. The aneroid and digital extreme environmental conditions, the barometers appear to be cost competitive manufacturer should be contacted to help alternatives to the mercury barometer. determine the appropriate technology.

Hygrometers/Psychrometers Flame Sensors Both the hygrometer and psychrometer are used The mercury containing flame sensor is used in to measure the relative humidity. They both can many applications as a safety device to prevent be replaced with a spirit-filled thermometer the flow of gas when a pilot lamp is not lit. An instead of a mercury thermometer and provide alternative to the mercury flame sensor is the the same functionality at similar costs. electronic ignition system. The electronic ignition system can be used in similar applications as the mercury flame sensor and is available for most products. The mercury flame

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sensor is often used in remote areas where and relay technologies because there are electricity is not always available. Without many design features and options electricity the electronic ignition system cannot available for each component, it appears automatically light the pilot or range. The pilot that mercury and non-mercury or range can however be lit by hand, but this switches/relays with similar functionality poses a safety issue. for many applications are comparable in price. Switches and Relays There were many common findings and · At least one manufacturer was identified conclusions during this research for float that produced both the mercury and non- switches, pressure switches, temperature mercury relay/switch with comparable switches, tilt switches, mercury wetted reed functionality at comparable costs. relays, and mercury displacement relays. The following is a summary of these similarities: The key differences identified between the · These components are used in a wide mercury switches and relays are as follows: range of products and applications. Switches: No design parameters for new · Numerous design parameters need to be switch products/applications were identified considered prior to final component where the mercury containing component selection. could not be replaced by a non-mercury alternative for a comparable cost. · Several different non-mercury alternative technologies were identified to replace Relays: The majority of design parameters each of the mercury switches and relays. for new relay products/applications could be met by a non-mercury alternative for a · Several manufacturers were identified for comparable cost. However, in some cases the most non-mercury alternative design parameters could not be met by a non- technologies. mercury alternative. For example, a mercury wetted reed relay application that requires · Manufacturers of mercury containing long life, no contact bounce, and low contact products often provide non-mercury resistance cannot be satisfied by any single alternatives. non-mercury alternative.

Non-mercury alternatives appear to be · Manufacturers often provide more than available in the United States marketplace to one non-mercury alternative technology. meet the various design parameters that specify

float, tilt, pressure, and temperature switches in · The non-mercury technologies identified new products and applications. Non-mercury provide a variety of options for each alternatives appear to be available in the United major design parameter. States marketplace to meet most, but not all, design parameters specifying the use of mercury · Non-mercury alternatives were identified wetted reed and mercury displacement relays in to meet the needs from low cost, simple new products and applications. applications to higher cost, more Although there are readily available non- demanding applications. mercury alternatives for new products and applications, complications can appear when · Although, it is difficult to precisely retrofitting existing mercury switches or relays in compare pricing for the various switch

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existing products and applications. The relay or only cost effective option because of the switch component of an existing product or following: application can wear out and require replacement before the end of service life for the product or 1) Solid-state relays and silicon controlled application. In some instances, the mercury rectifiers have power dissipation issues switch or relay is embedded in an existing that need to be addressed. These relays application in such a way that currently available cannot be easily retrofitted to existing non-mercury alternatives cannot be retrofitted control panels because they may not fit into the existing product or application. The in the available footprint, or there may following two scenarios illustrate this situation: not be enough ventilation to cool the device. In this case, a significant Retrofit Scenario 1: Mercury Tilt Switch control panel retrofit expense would be The Michigan based Clean Car Campaign required to accommodate the solid-state initiated its “Switch the Switch” program in relay or silicon controlled rectifier. 2001 to replace mercury tilt switches with 2) A non-mercury electro-mechanical non-mercury tilt switches in automobiles relay may not be sufficient to meet the across the nation. This program used the demands of this fast cycle application. metallic ball tilt switch to replace mercury 3) A dry reed relay may not be sufficient tilt switches found in hood lights and trunk to meet the high current demands of this lights. For many vehicle models, this is a existing application. simple, drop-in exchange that takes about 4) The market for hybrid relays appears to ten minutes. not be mature enough to cover the other design parameters for this particular Tilt switches are also used in antilock existing application. braking systems (ABS) for certain trucks and sport utility vehicles. However, the As the two examples above illustrate, the ABS system usually consists of two to three retrofitting of mercury switches and relays in mercury tilt switches that are physically existing products or applications can present embedded in a plastic box that is integrated challenges. The cost of the relay or switch with the braking mechanism. Because of component is often a small fraction of the total this complex design, there is not a simple cost of the product or application. In situations drop-in non-mercury tilt switch where a non-mercury alternative cannot be used commercially available for retrofitting the for retrofit purposes, it would be unreasonable ABS tilt switch system. and cost prohibitive to require the consumer to replace the entire product or retrofit the Retrofit Scenario 2: Mercury application. Displacement Relay Relays and switches are used in hundreds of An industrial application utilizes a control existing products and applications. Each product panel populated with twenty mercury or application would need to be examined on a displacement relays to control on-site case-by-case basis to determine if retrofitting equipment that requires high current. This with a non-mercury alternative is cost equipment also requires fast cycling for competitive. Therefore, it is not possible to proper control. One of the mercury specify situations in which retrofitting of existing displacement relays fails, and there is now a products or applications is cost competitive need to replace this failed mercury relay in without conducting further study of individual the existing control panel. A review of the products and/or applications. However, there are non-mercury alternatives reveals that a new certain common factors that could negatively mercury displacement relay may be the affect the cost competitiveness of retrofitting

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with non-mercury alternatives. These factors that fits the amperage requirements of the pump.” include: (Pollution Probe, 2000). · Factor 1: Numerous switches and/or LCSP contacted two float switch/bilge pump relays are combined to perform a manufacturers to determine if their float switches particular function could be used to retrofit bilge pumps with · Factor 2: The switch or relay is integrated external float switches. Both manufacturers with other components of the product or indicated that their float switch could be used to application retrofit their own bilge pumps, as well as other · Factor 3: There are heat dissipation issues manufacturer’s bilge pumps. One of these presented by using the non-mercury manufacturers did not recommend using their alternative float switch to retrofit another manufacturer’s · Factor 4: The physical size limitations or bilge pump because their float switches were not other design parameters of the specifically tested on other manufacturer’s bilge product/application cannot be met by the pumps. However, this manufacturer does non-mercury alternative provide non-mercury bilge pump models. · Factor 5: A custom-designed rather than LCSP also contacted a float switch off-the-shelf switch or relay is used to manufacturer that provides both mercury and meet unique operating requirements non-mercury float switches for use with bilge pumps and other applications. The manufacturer Float switches are used in bilge pumps and estimated that 98% of their float switches sold provide an illustrative example of retrofit were non-mercury models, and the remaining 2% considerations for existing equipment. There are were mercury models. two types of bilge pumps: There may be a small number of instances 1. Non-automatic operation: The bilge pump where the mercury float switch in a bilge pump does not contain a float switch and the cannot be replaced by a non-mercury float bilge pump is often controlled by manual switch. Factor 2 could occur when a mercury methods. However, non-automatic bilge float switch is integrated into the bilge pump pumps can often be converted to housing for automatic operation. Factor 4 could automatic mode by connecting an occur for bilge pumps with high amperage external float switch. requirements. For example, the Atwood 4201 2. Automatic operation: The bilge pump is non-mercury float switch is marketed as being controlled by a timer, a water detection able to convert any bilge pump to fully automatic technology, a combination of timer and operation that draws less than 12 amps at 12 volts water detection technology, or a float direct current. No situations were identified switch. If a float switch is used, it can where Factors 1, 3, or 5 would occur for bilge either be integrated into the bilge pump pump retrofit situations. housing or can be connected to the bilge pump and mounted externally to the 5.2 Recommendations pump. The float switch used in bilge pumps can be The product research conducted for this report either a mercury or non-mercury model. suggests that there are cost competitive, viable According to a recent study of mercury float non-mercury alternatives for a large majority of switches in bilge pumps, “Most switches are the priority mercury containing products. In most easily accessible for easy replacement of old cases, the purchase price of an alternative is switches, which have a shorter life span than comparable to the mercury device and if the bilge pumps. An old switch can usually be downstream costs are considered, non-mercury replaced by any mercury or non-mercury variety alternatives can be considerably more cost effective. Additional information to assist with

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the transition to non-mercury alternative products is provided in Appendix 3. Non-mercury alternatives have been researched and recommended for the following products: sphygmomanometers, esophageal dilators, manometers, barometers, non-fever thermometers, hygrometers, psychrometers, hydrometers, flow meters, and pyrometers. The two products where alternative replacements cannot be recommended for all applications are gastrointestinal tubes and industrial thermostats. More research is needed to understand gastrointestinal tubes applications and the viability of mercury replacement. It appears that digital thermostats cannot withstand the harsh environmental conditions demanded by certain industrial settings, and mercury thermostats are currently the only industrial type thermostats available that can perform effectively. There are cost competitive, viable non- mercury alternatives available and recommended for the following components of new products and applications: flame sensors, float switches, tilt switches, temperature switches, and pressure switches. The majority of design parameters for new relay products/applications could be met by a non-mercury alternative for a comparable cost. However, in some cases the design parameters could not be met by a non-mercury alternative. Also, the use of electronic ignition systems is not recommended to replace mercury flame sensors in remote areas where electricity is unavailable. Non-mercury alternatives were identified and recommended to meet the needs of retrofitting existing relay/switch products or applications. However, there are certain retrofit circumstances in which the cost implications preclude the use of the non-mercury alternatives.

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Hoerr, Donald, Solid-State Pressure Switches – Technology for Today’s Fluid Power 6.0 Sources Applications, IICA Journal.

Barr Engineering Company, “Substance Flow ICL Calibration Laboratories, www.iclslabs.com. Analysis of Mercury in Products” Prepared for the Minnesota Pollution Control Agency, August Inform, Inc., Purchasing for Pollution Prevention 15, 2001. Project (2002). “Mercury-Containing Products and Alternatives in the Health Care Setting”. California DHS, A Guide to Mercury Assessment Available at: and Elimination in Health Care Facilities. http://www.informinc.org/fsmerchealth.pdf (August, 2002). California Poison Control System, University of California (2000-2002). “Mercury and its Many Kansas Department of Health and Environment, Forms”. Available at: “Mercury Information Page”. Available at: http://www.calpoison.org/public/mercury.html http://www.kdhe.state.ks.us/mercury/ (August, (August, 2002). 2002).

Canzanello, Vincent J., MD; P.L. Jensen, RN; Knoop, Alan R., Fundamentals of Relay Circuit GL Schwartz, MD, “Are Aneroid Design, Reinhold Publishing, New York. Sphygmomanometers Accurate in Hospital and Clinic Settings?”, Arch Intern Med. Maine Department of Environmental Protection, 2001;161:729:731. “Mercury in Maine: A Status Report”, February 2002. Clean Car Campaign, Driving Forward – Switch the Switch, Volume 3, March 2002. Minnesota Pollution Control Agency, Managing Mercury Switches: Hazardous Waste Fact sheet Delta Institute, Inland Ispat Indiana Harbor #4.26 October 1998. Works, Bethlehem Steel Burns Harbor Division, United States Steel Gary Works, and Lake Minnesota Office of Environmental Assistance Michigan Forum, “A Guide to Mercury Mercury applications in major appliances and Reduction in Industrial and Commercial heating/cooling systems, April 1998. Settings”, July, 2001. Available at: http://delta- institute.org/Steel-Hg-report-0627011.pdf Minnesota Office of Environmental Assistance, (September, 2002). Mercury in Households and Commercial products and applications, John Gilkeson, Gordon, John A., Venture Development November 1997. Corporation, An Executive White Paper On: The World Electromechanical and Solid State Relay Minnesota Pollution Control Agency, “Mercury”. Industry, Fifth Edition, Volume I – North Available at: America. http://hubble.pca.state.mn.us/air/mercury.html (August, 2002). Gordon, John A., Venture Development Corporation, An Executive White Paper On: National Association of Relay Manufacturers, 2001/2002 Global Relay Market Intelligence Engineers Relay Handbook 2nd and 5th Edition, Service, April 2002. Hayden Book Company, New York.

New York Academy of Sciences, “Pollution Prevention and Management Strategies for

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Mercury in the New York/New Jersey Harbor”, Tellus Institute, “Healthy Hospitals: May 14, 2002. Environmental Improvements Through Better Environmental Accounting”, July 2000. Northeast Waste Management Officials’ Association, “Mercury-Added Product Timbrell, J.A., “Introduction to Toxicology”, Notification Form”. Second Edition, 1995, Taylor & Francis; pp. 118- 121. Northeast Waste Management Officials’ Association, “Total Mercury in All Mercury- United Nations Environment Programme Added Products”. (UNEP), (July, 2002). “Global Mercury Assessment”. Available at: Northeast Waste Management Officials’ http://www.chem.unep.ch/mercury/WG- Association, “Reported Mercury Spills in the meeting1-revised-report-download.htm (October, Northeast States”, October 2001. 2002).

Offner, Arnold, How do Relays Work, Motion United States Environmental Protection Agency, Control, July/August 1999. Mercury Study Report to Congress, December 1997. Pollution Probe, A Study of the use of Mercury Switches in Bilge Pumps of Pleasure Boats in United States Environmental Protection Agency Ontario, March 2000. and Environment Canada, “Background Information on Mercury Sources and Powell, William B. and Pheifer, David, “The Regulations; Appendix C. Regulations on Electrolytic Tilt Sensor”, Sensors, May 2000. Products that Contain Mercury”. Available at: http://www.epa.gov/grtlakes/bnsdocs/mercsrce/9 Pulse Metric, Inc., “Non-Invasive Blood Pressure 409merc.pdf (August, 2002). Measurement and Pressure Waveform Analysis”, (1996). United States Geological Survey, “Mercury in the Environment”, Fact Sheet 146-00 (October Purdue University, Department of Agricultural 2000) and Biological Engineering. “What Devices Contain Mercury?” Available at: United States Geological Survey, 2002 Mineral http://pasture.ecn.purdue.edu/~epados/mercbuild/ Commodity Summary – Mercury. src/devicepage.htm (August, 2002). University of Michigan Pollution Prevention Sedivy, David, Electronic Controls Spawn Program, “Mercury-Filled Esophageal Devices”. Integration, Appliance Manufacturer. Available at: http://www.p2000.umich.edu/mercury_reduction/ State of California Department of Health mr1.htm (August, 2002). Services, “A Guide to Mercury Assessment and Elimination in HealthCare Facilities”, September Von Rein, K. and Hylander L.D., Experiences 2000. Available at: from Phasing out the Use of Mercury in Sweden, http://www.dhs.cahwnet.gov/ps/ddwem/environ Regional Environmental Change, 2000, 1:126- mental/med_waste/guide_to_mercury_assessmen 134. t_v1.00.pdf (August, 2002). Williams, Raymond R., Sensors Magazine, April State of Maine Statutes, Title 38, Chapter 16-B, 1997, “An Introduction to Solid State Pressure Mercury-added Products and Services. Switches”.

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Winkler, Robert, and Wells Erik A., “The UVM Mercury Thermometer Swap. January, 1999. Available at: http://esf.uvm.edu/chemsource/thermoswap/ (October, 2002)

Wisconsin Department of Natural Resources, Draft Wisconsin Mercury Source Book.

Wisconsin Department of Natural Resources, Success Stories & Partnerships, August, 2002. Available at: http://www.dnr.state.wi.us/org/caer/cea/projects/ pollution/reports/1999/report2_p6.htm (October 2002)

Yeats, Mike, Derriford Hospital, Plymouth, UK, “The Maintenance of an Aneroid Sphygmomanometer”, Update in Anesthesia, Issue 3 (1993) Article 8, World Federation of Societies of Anaesthesiologists. Available at: http://www.nda.ox.ac.uk/wfsa/html/u03/u03_018 .htm (August, 2002).

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Appendix 1: Medical Device Reports for Spilled Mercury

The United States Food and Drug Administration (FDA) regulates the use of medical devices in the United States. In 1990, the Medical Device Reporting (MDR) system was implemented as a mechanism for the Food and Drug Administration to receive significant medical device adverse events from manufacturers, importers and user facilities, so they can be detected and corrected quickly. The following MDRs demonstrated the potential for health or environmental problems with mercury in healthcare. In addition to remediation associated with the mercury release (both environmental and health related), each MDR requires investigation and documentation at the reporting facility, the manufacturer, and the FDA.

Date FDA Received Reference & Description Report 05/09/2002 Baumanometer Stand-by Blood Pressure Machine “A blood pressure unit blew, causing 2.5 ounces of mercury to vaporize.” 10/23/2000 Baumanometer “Glass tube containing mercury on Baumanometer cracked causing mercury to spill in facility.” 01/05/2000 Rusch Maloney Esophageal Bougie “It is reported that the tip of the bougie broke off during use. Distal end was not retrieved at the time of the event. Upon removal of the device, it was noted that mercury was leaking from the broken end of the tube.” 10/12/1999 Pilling-Weck Maloney Esophageal Dilator 24 Fr. “During procedure, a bougie dilator for esophagus was transected inside the stomach, allowing mercury from the dilator to escape... The bougie that was used for the procedure had been expired.” 07/14/1999 Rusch Cantor Tube “It is alleged that a Cantor tube was inserted and mercury instilled. A subsequent x-ray indicated the presence of mercury in the stomach.”

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Appendix 2: Cost of Mercury Spills

Cost Estimate for Reference & Description Clean-up Small spill - $1000 http://www.melg.org/mcea/rcbmcrmt.htm Large spill - $tens of "Mercury Contamination Risk Control", Middle Cities Risk Management Trust, Okemos, MI thousands " A typical thermometer contains ½ to 3 grams (.018 to .11 ounces) of mercury. A typical household mercury fever thermometer contains approximately 1 gram of mercury. A typical barometer contains 1 pound (454 grams) of mercury and poses a significant spill risk. The cost of cleaning up a spill will vary by the size of the spill and the degree of exposure to property and people. Small spill clean-ups usually cost around $1,000 and large spills can go into the tens of thousands of dollars." 3 oral fever http://cc.ysu.edu/eohs/bulletins/MERCURY.htm thermometers - "The Hazards of the Element Called Mercury," Youngstown State University $5000 "Unfortunately, it does not take a large amount of mercury to produce a problem. In one specific instance, three oral fever thermometers were broken. The mercury fell onto the floor Not uncommon … in an office that was approximately ten square feet in size. Following the accident, the to exceed $25,000 mercury vapors present in the air of that room were about three times that permitted by OSHA. Consequently, the room had to be decontaminated, all carpeting had to be discarded at a total cost of about $5000. This was a very small mercury spill. It is not uncommon for cleanup costs of mercury spills to exceed $25,000." Reported costs went c) http://www.des.state.nh.us/nhppp/hospital_survey.htm up to $130,000 New Hampshire Mercury Reduction Project: Hospital Baseline Survey 1999 Preliminary survey results, New Hampshire Department of Environmental Services "Spills and Breakages - Seven hospitals indicated some kind of mercury spill or equipment breakage and release during 1998. The actual number of spills may be higher, as small spills and breakages may not always be reported. Most hospitals did not have any idea of the cost of clean-up, but reported costs went up to $130,000!!" ~$5,000 for 1 http://dnr.metrokc.gov/swd/bizprog/waste_pre/MIRTsem8.htm broken Medical Industry Waste Prevention Round Table Reducing Mercury in Hospitals and sphygmomanometer Biomedical Facilities (A MIRT Seminar, May 23, 2001), King County, Seattle, WA " Economic Considerations One hospital spent · Clean up costs – It often costs ~$5,000 for 1 broken sphygmomanometer - you could buy 30 $10,054 to clean up or 40 non-mercury ones for that cost. One local hospital recently spent $10,054 dollars to a spilled clean up a spilled sphygmomanometer. sphygmomanometer · Regulatory Costs - 30-ppt pretreatment level in some places (fines) · Hazardous Waste training costs · Joint Commission on Accreditation of Health Care Organizations (JCAHO) compliance - JAHCO is starting to ask questions" $570,000 to clean up http://dnr.metrokc.gov/swd/bizprog/waste_pre/MIRTsem8.htm after sink trap work "Question: How did you get voluntary switch-out of Hg? Answer: VA People remember the Hg spills and are willing to work to avoid going through it Environmental again. UW always calls in Foss Env. for any spills. Just for Foss's services costs $1000- service (alone) for $1500. any spill costs Someone at Bowling Green University changed their sink traps, piled them up and carried $1000-1500 them across campus. Mercury was spread everywhere. Cost $570,000 to clean up." $350,000 to clean up http://204.178.120.25/library/college.htm contamination and XL Environmental, Exton, PA restore building to “ Spill Spreads Mercury Contamination - A large university in Ohio contracted plumbing original condition work on one of its science labs. While dismantling laboratory piping, the contractor discovered an existing mercury spill that resulted in mercury contamination throughout the building. Costs to clean up the contamination and restore the building to its original condition were $350,000.”

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alternative was sought. An alcohol thermometer was chosen from a catalog because it was similar Appendix 3: Transition to Non- in size, shape and temperature range and appeared to be a drop-in substitution. The alcohol mercury Products thermometer proved to be unsuitable when the alcohol column quickly separated due to the There are many challenges to substituting bumping and jarring the thermometer received in more benign alternatives for mercury containing the application. When the supplier was consulted, products and components. Most alternatives are after the fact, a much more appropriate not drop-in substitutions. That is, although an alternative was recommended and it performed alternative may ultimately achieve the same capably. outcome, such as providing an accurate measure Fortunately there are many resources available of blood pressure or sensing a flame, there are for smoothing the transition away from mercury usually design considerations or different components and products. These include techniques or practices that must be learned and manufacturers’ technical support staff, online communicated. Even under the best of how-to guides, email lists that share questions circumstances progress involves risk and there and answers, and pollution prevention may be unexpected outcomes, both favorable and organizations that can provide guidance. A undesired. sampling of useful resources follows. (Many of On the bright side, one manufacturer reported these resources are related to healthcare, an that he continues to learn about the utility of his industry that has been at the forefront of mercury company’s oscillometric blood pressure monitor reduction). from doctors using the device. The breadth of blood pressure information offered by the Organizations’ Websites monitor was unexpectedly revealing of a patient’s condition, far exceeding the diagnostic Health Care Without Harm (HCWH) utility of the simple systolic and diastolic blood http://www.noharm.org pressures provided by a mercury The mercury section of the HCWH website sphygmomanometer. In another example, a contains a wealth of information about reducing digital manometer used for calibrating mercury in healthcare. The Health Care Without sphygmomanometers can result in more accurate Harm coalition is an international campaign to calibration than the mercury manometer. reform the environmental practices of the health Depending on the quality of instruments used, the care industry. Health Care Without Harm difference can be as great as having a (HCWH) is comprised of more than 300 sphygmomanometer with an accuracy of + organizations in 27 countries and includes major 3.1mm Hg by using a digital manometer for a health care systems, regulatory bodies, and reference, versus + 6 mm Hg by using a mercury industry leaders. manometer. (Welch Allyn, 2002)

On the negative side, many well designed Hospitals for a Healthy Environment (H2E) products and practices will need to be rethought http://www.h2e-online.org/ and non-mercury components may not even fit in The goal of H2E is to educate health care the footprint of an existing product. There is also professionals about pollution prevention a learning curve associated with new designs and opportunities in hospitals and healthcare systems. components and it is likely that there will be H2E fosters the development and communication glitches and unintended outcomes as products are of best practices, model plans for waste changed over. One example is the replacement of management, resource directories, case studies, a mercury column thermometer in an industrial and how-to tools for minimizing the volumes of setting. After a mercury thermometer broke in waste generated and the use of persistent, use and required clean up, a non-mercury

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bioaccumulative, and toxic chemicals. H2E is a joint project of the American Hospital Sustainable Hospitals Project Association (AHA), the Environmental http://www.sustainablehospitals.org Protection Agency, Health Care Without Harm The Sustainable Hospitals Project (SHP) and the American Nurses Association. In provides technical support to the healthcare addition, various state and local resources are industry for selecting products and work active participants in the effort to help hospitals. practices that eliminate or reduce occupational Two areas of note are the Listserv, an online and environmental hazards. The SHP website forum for discussion, and the H2E website’s lists alternative products and manufacturer Mercury area. contacts and SHP maintains a technical help line (phone & email) to provide technical support and s H2E Listserv help hospitals improve their practices. http://www.h2e-online.org/programs/list.htm The Hospitals for a Healthy Environment (H2E) Journal Article & Reports Listserv is a communication tool for health care professionals to share information about Vincent J. Canzanello, MD; Patricia L. Jensen, minimizing the volume and toxicity of health RN; Gary l Schwartz, MD, “Are Aneroid care waste. Healthcare facilities across the Sphygmomanometers Accurate in Hospital and country are designing and implementing many Clinic Settings?”, Arch Intern Med, 2001; projects, including starting recycling programs, 161:729-731. eliminating mercury containing devices, and This article summarizes an evaluation done at purchasing environmentally preferable products. Mayo Clinic in Rochester, Minnesota to assess There are countless opportunities to share the accuracy of aneroid sphygmomometers used questions, answers, and advice through this in their hospitals. Their conclusion was “Aneroid Listserv. sphygmomanometers provide accurate pressure measurements when a proper maintenance s H2E Mercury Resources protocol is followed.” http://www.h2e-online.org/tools/mercury.htm The Mercury area of the H2E website includes Maine Department of Environmental Protection, many resources and links for reducing mercury. (February, 2002). “Mercury in Maine: A Status One very nice document is the “Mercury Virtual Report”. This report provides an update to the Elimination Plan”, found at: http://www.h2e- 1997 report on Mercury in Maine and it online.org/tools/merc-over.htm addresses the Maine mercury reporting This is a comprehensive how-to guide to help requirements enacted in May 2000. Available at: hospitals assess existing mercury sources, http://www.state.me.us/dep/mercury/hginmerepo develop action plans for elimination, and set up rt.htm (September, 2002) an environmentally preferable purchasing plan. non-mercury Tellus Institute, (July, 2000). “Healthy Hospitals: Northeast Waste Management Officials’ Environmental Improvements Through Association (NEWMOA) Environmental Accounting”. This report http://www.newmoa.org examines environmental accounting practices in http://www.newmoa.org/Newmoa/htdocs/prevent the health care industry and explores whether ion/mercury/ environmental accounting is a useful approach The information resources available in the for uncovering waste minimization opportunities. mercury area of the NEWMOA website are The report also considers opportunities for designed to help the NEWMOA states achieve influencing upstream procurement practices and their “virtual elimination” goal for mercury by supply chain issues. Available at: focusing in particular on efforts to reduce or eliminate mercury from the waste stream.

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http://www.epa.gov/opptintr/acctg/pubs/hospitalr http://www.welchallyn.com/medical/support/man eport.pdf (September, 2002) uals/Aneroid%20Calibration%20Memo.pdf (August, 2002) United Nations Environment Programme (UNEP), (July, 2002). “Global Mercury Online Case Studies & Mercury Videos Assessment”. This report provides a global assessment of mercury and mercury compounds, Clean Car Campaign, “Switch the Switch”, including options for addressing significant Driving Forward: Volume 3, March 2002. global adverse impacts of mercury. The Available at document examines and summarizes worldwide http://cleancarcampaign.org/pdfs/wol_3%20_Ma efforts to control releases and limit use of and rch_2002.pdf (September 2002). exposure to mercury, including: national initiatives, international agreements and The Delta Institute, Inland Ispat Indiana Harbor instruments, international organizations and Works, Bethlehem Steel Burns Harbor Division, programs, and sub-regional and regional United States Steel Gary Works, and Lake initiatives. Sections that most relate to Maine Michigan Forum, “A Guide to Mercury DEP study include: Reduction in Industrial and Commercial 8. Prevention and control technologies and Settings”, July, 2001. Available at: http://delta- practices institute.org/Steel-Hg-report-0627011.pdf 9. Initiatives for controlling releases and (September, 2002). limiting use and exposure Appendix. Overview of Existing and Future Sustainable Hospitals Project “Mercury National Actions, Including Legislation, Reduction Case Studies”, Available at: relevant to mercury; by Region. http://www.sustainablehospitals.org/HTMLSrc/I Available at: P_Merc_CS_Strong.html (September, 2002). http://www.chem.unep.ch/mercury/WG- meeting1-revised-report-download.htm (October, Tellus Institute, (July, 2000). “Healthy Hospitals: 2002). Environmental Improvements Through Environmental Accounting”. Appendix B in this report includes a mercury reduction case study at Manufacturer’s Resources Kaiser Permanente.

Welch Allyn, Inc. (January 11, 2000). "Analysis United States Environmental Protection Agency, of Different Sphygmomanometer Technologies". “Mercury Pollution Prevention in Michigan This provides a discussion on the different types Hospitals”. Available at: of blood pressure devices and their merits and http://www.epa.gov/seahome/mercury/src/prevca shortcomings. Available at: se.htm (September, 2002). (http://www.welchallyn.com/medical/support/ma nuals/Tycoswhitepapers.PDF University of Michigan, Occupational Safety and (August, 2002). Environmental Health, “Mercury-Filled Esophageal Dilators”. Available at: Welch Allyn, Inc. (July 10, 2002) "Calibrating http://www.p2000.umich.edu/mercury_reduction/ Your Sphygmomanometer". This describes mr1.htm (September, 2002). considerations for routine calibration of sphygmomanometers and describes how digital University of Vermont, “Mercury Thermometer reference meters can potentially offer a more Swap”. (Lab thermometers) Available at: accurate calibration than mercury references. http://esf.uvm.edu/chemsource/thermoswap/ Available at: (September, 2002).

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Western Lake Superior Sanitary District, (March, 1997) “Addressing Sources of Mercury: Success Stories”. Available at: http://www.wlssd.duluth.mn.us/Blueprint%20for %20mercury/HG12.HTM (September, 2002).

The Michigan Department of Environmental Quality , Bowling Green University, Ohio Environmental Protection Agency and Radar Environmental have produced two video clips which allow viewers to see mercury vapor rising from elemental mercury. Two short online videos show mercury vapor at room temperature rising from a petri dish of mercury and from mercury spilled from a broken fever thermometer onto a carpet. Available at: http://www.ecosuperior.com/pages/mercuryvapo ur.html (September, 2002).

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Appendix 4: Maine DEP Letter to Manufacturers of Mercury-added Products

The information request below was sent to manufacturers who filed information on mercury-added products with the Interstate Mercury Education and Reduction Clearinghouse (IMERC). As explained in section 2.0 of this report, IMERC was formed under the auspices of the Northeast Waste Management Officials’ Association to, among other things, coordinate implementation of state laws that prohibit sale of mercury-added products unless the manufacturer has disclosed the amount and purpose of the mercury. Maine, New Hampshire, Connecticut and Rhode Island have such laws.

May 1, 2002

Dear [manufacturer]:

Enclosed please find a copy of An Act to Phase Out the Availability of Mercury-added Products as recently enacted by the Maine Legislature.

The law contains two sections. Section 1 prohibits the sale or distribution of a mercury-added thermostat in Maine for most residential and commercial applications after January 1, 2006. It also provides an exemption process from the prohibition where specified demonstrations can be made.

Section 2 of the bill requires the Department to review information on mercury-added products and, based on that review, prepare a comprehensive strategy to reduce their mercury content. The strategy is due to the Legislature by next January, and presumably will be considered by the Legislature as it contemplates additional legislation regarding mercury-added products.

One of our main sources of information that will be utilized in this effort is the data you and other manufacturers already provided under the mercury product notification law enacted last year. As you will recall, that law-38 MRSA §1661-A-prohibits the sale of mercury-added products in Maine after January 1, 2002 unless the manufacturer has notified the Department as to the amount and purpose of the mercury.

Preparation of the strategy the Legislature seeks will also require additional information, such as the availability of non-mercury alternatives, and on manufacturers' plans (if any) to phase out the use of mercury. This is why I write to you now - to provide you with the opportunity to provide specific information on your product(s) that can be considered by the Department in the development of its strategy. The additional information you provide will be considered in conjunction with research performed by a consultant the Department intends to retain shortly.

At this time, we are focusing our inquiry on mercury-added products (other than lamps and dental amalgam) that contain more than 100 milligrams of mercury or, for formulated products like cosmetics and cleansers; that have a mercury concentration exceeding 50 ppm. If you make such a product or products, we invite you to submit the following information:

· Your plan, if any, for reducing or phasing out the use of mercury, including relevant

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timetables for such reductions or elimination, · Information bearing on the availability, feasibility and affordability of non-mercury alternatives to the product; · The public health, environmental or other societal benefits (if any) of continuing to use mercury in the product; and · Any other information you believe relevant to the development of the Department's strategy.

The timetable for completing this strategy is driven by the Legislature's January 1, 2003 deadline. To meet this deadline, we need to receive your information by June 30, 2002 so that it can be adequately considered by the Department and its consultant before preparation of a draft document. The draft document should be available in early fall, and I will provide one at your request.

Thank you for your help, and please feel free to call me at (207) 287-8556 or email me at [email protected] if you have questions.

Sincerely,

Enid Mitnik

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Appendix 5: Aneroid sphygmomanometers, rather than selecting portable aneroid devices. One manufacturer has Sphygmomanometers also responded to these concerns by developing and introducing a gear-free aneroid Aneroid sphygmomanometers are comparable to sphygmomanometer that purportedly can fall 30 mercury sphygmomanometers in cost, technique inches onto a hard surface and still remain and performance. However, some medical accurate. (Welch Allyn) professionals hesitate to adopt aneroid blood pressure devices because of conflicting Comparative Characteristics of statements they have heard about aneroid gauge performance. This appendix addresses common Sphygmomanometers perceptions about aneroid sphygmomanometers. Sphygmomanometers are introduced to the What are the concerns about aneroid marketplace only after thorough testing and evaluation. Sphygmomanometers sold in the sphygmomanometers? United States are regulated and must be approved by the Food and Drug Administration (FDA). Obtaining accurate blood pressure measurement The FDA approval process requires companies to is a foremost concern in the selection of show that new sphygmomanometers are sphygmomanometers. Once calibrated, there is substantially equivalent to models already on the no expected difference in performance between market and to demonstrate accuracy through a aneroid and mercury sphygmomanometers clinical validation study. The FDA recognizes manufactured by reputable companies. All ANSI/AAMI SP-9 (a voluntary standard) as a sphygmomanometers need routine calibration performance standard and both aneroid and checks and regular preventive maintenance. The mercury sphygmomanometers meet this standard. procedures are different for mercury and aneroid This Standard covers functionality, accuracy and sphygmomanometers, but are otherwise safety, including requirements and suggested equivalent in frequency, complexity and the tests to verify compliance. amount of attention required. In practice, aneroid and mercury sphygmomanometers require Many United States hospitals have eliminated different calibration techniques but otherwise mercury sphygmomanometers. Indeed, several proportionate amounts of attention. hospitals in Maine are among those that eliminated the mercury devices, including: Some medical professionals have concerns that Eastern Maine Medical Center in Bangor, Maine aneroid sphygmomanometers are easily damaged General Health in Augusta, Mercy Hospital in during use, resulting in inaccuracy due to the Portland, Mid Coast Hospital in Brunswick, St. device being dropped or bumped and knocked Andrew’s Hospital in Boothbay Harbor, and out of calibration. This is perceived to be less of Southern Maine Medical Center in Biddeford. a concern for mercury sphygmomanometers due Four of these hospitals interviewed in a recent to the mercury column’s rigid mounting survey reported that the alternatives perform requirements. Because the mercury column must satisfactorily. There are many more hospitals that be perfectly vertical in its mounting and the have not completely eliminated mercury mounting perpendicular to the floor for accuracy, sphygmomanometers but have phase out most mercury devices are either wall mounted or programs underway. (EPA, HCWH) mounted on robust mobile stands. Concerns about dropping aneroid devices can be alleviated Both mercury and aneroid sphygmomanometers by purchasing aneroid sphygmomanometers as require routine maintenance. Key issues for either wall-mounted units or mounted on mobile mercury gauges include: verify (and adjust if stands, comparable to the mercury

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necessary) the zero level of mercury, replace air accurate measurements if properly calibrated”. filter, verify that column is perpendicular in its (Perloff et al) unit and vertical to the ground, check for American Heart Association: “… because of the oxidation of mercury (making column appear risk of the toxic effects of mercury spills, dirty and difficult to read) and clean tube if mercury manometers must be handled carefully necessary. Key issues for maintenance of aneroid and their use has been discouraged in some areas gauges include: check needle for smooth rotation, of high traffic where accidental spills are more and test accuracy at several intervals against a prone to occur.” (Perloff et al) reference meter. American Medical Association: “When in proper functioning condition, both mercury and aneroid In addition to managing the maintenance and sphygmomanometers are acceptable instruments calibration of the sphygmomanometers for blood pressure measurement.” (Bailey and themselves, hospitals that use mercury gauges Bauer) must also maintain the capability to safely handle American Medical Association: “Lest clinicians mercury and respond to a mercury spill. Mercury be lulled into a false sense of security about the spill capability includes personnel trained to accuracy of the mercury column manometer, respond to a spill on a 24-hour, 7 day per week frequent examination of the instrument is basis, a mercury spill kit, hazardous waste necessary to eliminate it as a source of blood resources for decontaminating a spill area and pressure measurement error.” (Bailey and Bauer) removing the mercury, and the financial Working Meeting on Blood Pressure resources for the spill response and liability Measurement: “There is no reason to fear associated with mercury exposure. replacing mercury manometers with manual aneroid devices. The issue is ensuring validation, Increasingly hospital Group Purchasing calibration, and regular maintenance.” (Summary Organizations (GPOs) are voluntarily supporting Report: National High Blood Pressure Education pollution prevention efforts. Premier, a Program, “Equipment Calibration” discussion by healthcare alliance collectively owned by more Dr. Bruce Morgenstern, April 19, 2002) than 200 independent hospitals and healthcare systems in the United States (representing more References and Supplemental than 1,500 hospitals and healthcare sites) recently Information announced it will no longer allow products containing mercury to be offered through any Richard H. Bailey and John H. Bauer, “A review group contract, unless no viable alternative of common errors in the indirect measurement of exists. This means that mercury blood pressure sphygmomanometry”, Archives of sphygmomanometers will no longer be offered. Internal Medicine, December 27, 1993 Consorta, Inc, (a cooperative health care resource This document reviews three sources of error in management and GPO, whose shareholders are indirect measurement of blood pressure (observer Catholic-sponsored, faith-based or non-profit bias, equipment, and lack of measurement health systems) also has an effort underway to standardization) and the effect of these errors on obtain shareholder approval to take mercury accuracy. It also reviews techniques for proper containing medical devices off their contracts. for blood pressure measurement.

Conclusions from National Medical EPA Region 1 Mercury Challenge Program Associations on Sphygmomanometers http://www.epa.gov/region01/assistance/neeat/m ercury/Directory2000.pdf (accessed 1/13/03) American Heart Association: “The aneroid http://www.epa.gov/region1/pr/2001/apr/010428. manometer is also widely used and can provide html (accessed 1/13/03)

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These references highlight mercury reduction blood pressure. It is a useful resource that activities in the New England region under the includes potential errors in measuring blood EPA’s Region 1 Mercury Challenge program. pressure and ways to correct or avoid them. About a year ago, the Mercury Challenge program was merged with EPA nationwide “The Sixth Report of the Joint National efforts under the Hospitals for a Healthy Committee on Prevention, Detection, Evaluation, Environment Program (H2E). and Treatment of High Blood Pressure”, National Institutes of Health, National Heart, Lung, and “Guidance for Industry: Non-Automated Blood Institute, NIH Publication No. 98-4080, Sphygmomanometer (Blood Pressure Cuff) November 1997 Guidance Version 1”, November 19, 1998 http://www.nhlbi.nih.gov/guidelines/hypertensio http://www.fda.gov/cdrh/ode/blprcuff.pdf n/jnc6.pdf (accessed 1/13/03) (accessed 1/13/03) This document provides guidance for primary This is the FDA requirement for manufacturers to care clinicians. obtain approval to introduce new sphygmomanometers. Summary Report: National High Blood Pressure Education Program (NHBPEP)/National Heart, Health Care Without Harm (HCWH), “A New lung, and Blood Institute (NHLBI) and American Era: The Elimination of Mercury Heart Association (AHA) Working Meeting on Sphygmomanometers” Blood Pressure Measurement. National Institutes http://www.h2e- of Health, April 19, 2002 online.org/pubs/news/sphygmo.pdf (accessed http://www.nhlbi.nih.gov/health/prof/heart/hbp/b 1/13/03) pmeasu.htm (accessed 1/13/03) This publication discusses elimination of mercury This working group meeting examined the sphygmomanometers in hospitals. It includes a science supporting current blood pressure table of hospitals that had eliminated mercury measurement policies and sought to identify sphygmomanometers as of January 2002. additional research needed to develop policies to improve blood pressure measurement. Dorothee Perloff, Grim, Carlene; Flack, John; Frohlich, Edward D.; Hill, Martha; McDonald, Welch Allyn DuraShock Sphygmomanometer Mary; Morgenstern, Bruce, “Special Report: http://rcs.welchallyn.org/productpg.nsf/intro/dur Human Blood Pressure Determination by ashock?opendocument (accessed 1/14/03) Sphygmomanometry” [AHA Medical/Scientific This web reference is a link to product Statement] information on a gear free aneroid American Heart Association, Volume 88(5), sphygmomanometer that is more shock resistant November 1993, pp 2460-2470 than traditional aneroid sphygmomanometers. http://www.americanheart.org/presenter.jhtml?id (There is no implied endorsement of the product). entifier=3000894 (accessed 1/13/03) This is the American Heart Association’s recommendation for indirect measurement of

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