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Gas List 2013 List of Detectable Gases and Vapours 9046375 Gaseliste 2012 ENGL 4 20.12.12 11:53 Seite 2 9046375 Gaseliste 2012 ENGL 4 20.12.12 11:54 Seite 3

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Gas List 2013 List of Detectable Gases and Vapours 9046375 Gaseliste 2012 ENGL 4 20.12.12 11:53 Seite 2 9046375 Gaseliste 2012 ENGL 4 20.12.12 11:54 Seite 3 9046375_Gaseliste_2012_ENGL_4 20.12.12 11:53 Seite 1 9 0 0 2 - 5 5 2 4 3 - D Gas List 2013 List of detectable gases and vapours 9046375_Gaseliste_2012_ENGL_4 20.12.12 11:53 Seite 2 9046375_Gaseliste_2012_ENGL_4 20.12.12 11:54 Seite 3 Dräger Gas List 2013 List of detectable gases and vapours Gas list to find a suitable fixed installed Dräger gas detection instrument for a specified substance Edition December 2012 Subject to alteration Dräger Safety AG & Co. KGaA Lübeck, 2012 9046375_Gaseliste_2012_ENGL_4 20.12.12 11:54 Seite 4 04 | DRÄGER GAS LIST 2013 | SEARCH INDEXES Search Indexes This list of gases consists of three search indexes and the main part. The search indexes are suitable to find the substance in question by having only its name (including short name or technical abbreviation), its sum formula, or its CAS-number. Using the search indexes you will obtain the substance’s Search Index for Sum formula associated number to look for in the list of gases. For every chemical formula - normally given as a semi-structure formula - a If the substance is not listed, this does not necessarily sum formula exists. A sum formula is mean that this substance is not detectable by Polytron formed according to the Hill-system: equipment. Within each sum formula the element symbol C (for Carbon) is on the first place, the element symbol H (for Hydrogen) on the second, followed by all other element symbols in alphabetical order. For every element symbol the order is given with increasing number of Search Index for CAS-Number When searching 1.2-Dichloroethane atoms of the corresponding molecule. The CAS-number is a worldwide used look for Dichloroethane, find tert- So it seems a little bit strange having a code to identify a chemical substance Butanol under Butanol and Methyltert sum formula of e.g. ammonia H 3N, of unambiguously. This number is issued butylether under Methylbutylether. sulphur dioxide O 2S and of hydrogen by the Chemical Abstracts Service and cyanide CHN. is the easiest way to characterize a This search index also lists short names chemical substance. Knowing the or technical abbreviations. However Having the chemical formula of a CAS-No. means to be able to get these names may be ambiguous from substance, the individual element comprehensive information and links chemical aspects (e.g. Dimethyl ether symbols have to be summarized and from internet and search engines. and Dimethoxy ethane usually both are sorted accordingly. With the sum short-named as “DME”). formula obtained this way you can go The considered substance is into the search index for sum formulas unambiguously specified by the CAS-No. Furthermore refrigerants were to get the substance’s associated considered. The code basically is number. Search Index for Name / Abbreviation preceded by “R” meaning refrigerant When sorting alphabetically the although in other countries characters Example: CH 3COOH chemical prefixes such as n-, i-, sec-, such as “F”, “FCK”, “HFA” or names tert-, N-, N.N-, or numbers were omitted. such as “Freon”, “Frigen” and Sum formula is C 2H4O2. This is the sum Please proceed correspondingly when “Propellant” etc. are used. So, if you formula of acetic acid. But you can verify looking for a substance. look for e.g. Freon 134a please search that this is also the sum formula of for R 134a. Methyl formate (HCOOCH 3). Attention: Sum formulas may be ambiguous! The printed data have been ascertained with utmost care. Indemnifications or warranty claims on account of missing or incorrect data are excluded. 9046375_Gaseliste_2012_ENGL_4 20.12.12 11:54 Seite 5 THE GAS LIST | 05 The Gas List This list is the real list of gases. For each substance there are at least three lines. Besides the column of the current number the gas list comprises 17 columns which are explained in the following: Column 1: Substance / Chemical Example: n-Butanol: 2.56 r Example: Ethyl acetate, M = 88.1 g/mol, Formula ρ = 0.90 g/ml, LEL = 2.0 %v/v. The main name covers two columns in Vapours of n-Butanol are 2.56 times the first line. The 2 nd line shows the heavier than air. To obtain 50 %LEL (c = 1.0 %v/v) CAS-No., and the 3 rd line shows the vapour of Ethyl acetate in the 3-litres chemical formula. By using the mol weight M you can calibration chamber insert convert concentrations given in %v/v _8_8_.1_ Column 2: Shortn. and S-formula (= % by vol.) or ppm to obtain g/m 3 or F = 1.2478 . 1.0 = 122 microlitres 0.90 If there is a technical abbreviation mg/m 3. known it is listed in this column 2 nd line. of liquid Ethyl acetate. The sum formula is printed in the Using the mol weight M you can also 3rd line. calculate the density of a gas in kg/m 3 If the flashpoint of the liquid is less than (at 20 °C and 1013 hPa) by simply 25 °C the value of the amount to be Column 3: Synonyms multiplying with a factor of 0.04179: inserted into the 3 litres calibration If further names are known the most chamber to obtain 50 %LEL is printed usual ones are listed here. Example: The mol weight of Propane is below the value of the density. 44.1 g/mol, so the density of Propane is: It is marked by a subsequent “v” Column 4: Molw. g/mol (for volume). 3 In the first line the molecular weight ρ = 0.04179 44.1 = 1.843 kg/m (mol weight) M is listed. The mol weight Example: n-Hexane: 81 v is used in many calculations, e.g. you If density ρ and mol weight M are known You need to insert 81 microliters into the can calculate the relative density of a you are able to calculate the amount of Dräger Calibration Chamber to obtain gas or vapour by dividing value M by liquid to be evaporated in a given 50 %LEL of hexane vapour. 28.96. If the result is less than 1 the gas volume to obtain a defined vapour is lighter than air. In most cases the concentration. However, it is very result will be greater than 1 - so it is important that this liquid is evaporated heavier than air. In case of vapours, completely. This requires a sufficiently however, the maximum vapour pressure high vapour pressure. (the maximum concentration at a given temperature) in an air/vapour mixture Use the “calibration chamber formula”: has to be regarded (see vapour To obtain a vapour concentration c in a pressure column 7): Vapours can never volume of 3 litres at 20 °C and 1013 mbar exist in a 100 %v/v-concentration! you have to insert the following amount F (in microlitres) of the liquid: Below the mol weight the value of the relative density compared to air is listed. F = 1.2478 . _M_ . c ρ It is marked by a subsequent “r” (for relative). 9046375_Gaseliste_2012_ENGL_4 20.12.12 11:54 Seite 6 06 | DRÄGER GAS LIST 2013 | THE GAS LIST The Gas List Column 5: Dens. g/ml So at 20 °C no vapour concentrations The relatively high flashpoint of In this column the density ρ of the liquid higher than 4900 ppm n-Nonane can n-Nonane is arising from its low vapour in g/ml (= g/cm 3) at 20 °C is listed. This exist. Only higher temperatures may pressure. As already shown it is not value exists only for liquids, so gases produce higher vapour concentrations. possible to produce vapours of are indicated by “Gas”. Since the Lower Explosion Limit is 100 %LEL under normal conditions 0.7 %v/v even in a closed containment at (20 °C). Column 6: Boil. °C 20 °C no explosive vapour/air-mixtures As the flashpoint is a temperature you This column is self-explaining, it shows of n-Nonane can form. can also convert a flashpoint F given in the boiling point of the substance in °C degrees Celsius into a flashpoint F (at 1013 mbar). It is essential that the “calibration given in degrees Fahrenheit using the chamber formula” does not apply for conversion Below the boiling point given in °C the substances with a low vapour pressure, 9 boiling point is printed in °F. This value e.g. dosing to obtain 0.6 %v/v of F = __ . F + 32 deg. Fahrenheit °F 5 °C is marked by a subsequent “°F”. n-Nonane vapour at 20 °C is not possible. Example: n-Nonane, flashpoint is 31 °C, Column 7: p mbar 20 9 Vapour pressure p of a liquid at 20 °C Column 8: Flpt. °C F = __ . 31 + 32 = 87.8 °F 20 °F 5 given in mbar (= hPa). Vapour pressure This column shows the flashpoint of is only defined for liquids. So for gases flammable liquids. Flammable gases do Below the flashpoint F given in °C the instead of the vapour pressure you will not have a flashpoint and are marked by flashpoint is printed in °F. This value is find the marking “Gas” in this column. “Gas”. Gases or liquids being non- marked by a subsequent “°F”. flammable are marked by ‘n.a.’. The vapour of each liquid forms a Example: n-Nonane, flashpoint 88 °F pressure which depends on the nature The flashpoint is defined as the of liquid and the liquid’s temperature. If temperature of a flammable liquid which Columns 9, 10 and 11: LEL the vapour pressure is low, the liquid (in a closed containment) is needed to These columns show the lower evaporates slowly and thus only obtain an ignitable vapour concentration explosion limit in %v/v.
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