Competence in turbidity, solids and sludge level measurement Cost-saving solutions for control, monitoring and quality assurance Liquid analysis solutions Endress+Hauser is a global provider of Endress+Hauser has been a specialist in degree of automation in almost every pro- solutions for process automation. analysis measuring technology for the duction area, Endress+Hauser has achieved For production and logistics, the com- environment and process industry for over a great vertical range of production. As a pany develops sensors and systems which 30 years. The extraordinarily high number result, the client receives high and constant retrieve, transmit and process informa- of research and development resources product quality as well as excellent delivery tion from the processes. Future-oriented guarantees the efficiency, performance and reliability for all standard products and for services, and products excelling both in high quality of the products. The latest individual products tailored to suit special terms of price and performance, support technology for safe processes can be made applications. Measuring technology from the competitiveness of clients thanks to permanently available to the user. Endress+Hauser stands for reliable meas- the highest degree of quality, safety and By mastering all technically demanding ured values, a high degree of availability efficiency. processing steps, in conjunction with a high and long operating times. Competence in turbidity, solids and sludge level measurement The focus is on solutions for the water and 90° scattered light measurement method in measurement. As an alternative, ultrasonic wastewater sectors. Here, it does not matter conformity with DIN/ISO, Endress+Hauser methods can also be used here to determine whether the turbidity is being measured in is offering you a universal sensor system the height of the sediment in a basin or the waterworks downstream of a sand filter suitable for the most common applications. tank by measuring the time-of-flight of the in the limit range of the optical measuring The product portfolio is extended with ultrasonic signal. technology or whether the solids content sensors based on the 4-beam alternating is being measured in thickened sewage light method, working with absorption, sludge which can almost no longer be 90° scattered light or backscattered light, pumped – Endress+Hauser's sensors cover depending on the measuring range. These a wide range of applications. So with the optical sensors are also used for sludge level 2 3 Research and development pay off Numerous awards for innovation are CUS1, CUS3 and CUS4 sensors which proof of the tradition of research and are continued and developed further in development at Endress+Hauser. This the 2nd generation as CUS31 and CUS41. R&D goes back a long time in turbidity But the sensor technology is not the only and solids measurement. In addition to thing that is state of the art; the fully pH and conductivity, turbidity has become automatic calibration stand to DIN/ISO the third largest parameter in analysis which all sensors have to pass through after measuring technology and continues to manufacture sets standards worldwide. grow. The success story all began with the Flexible measuring point concept Thanks to their design, turbidity and solids CUA250 flow assembly or the CUA451 ball sensors from Endress+Hauser are suitable valve retractable assembly. The Liquisys M for installation in pipes or tanks as well CUM2x3 transmitter is available as panel as for immersion applications at basins or field housing. The transparent operating or channels. A wide range of assemblies concept corresponds to the Liquisys place the sensor safely in the process, be transmitters for the parameters oxygen, it with the CYY105 immersion tube, the chlorine, pH or conductivity. 2 3 Turbidity measurement in drinking water Turbidity measurement in the drinking undissolved materials present, turbidity water sector is an important parameter describes a visually detectable feature for quality. The legislation in almost every for the consumer. All the necessary steps country in the world stipulates a limit involved in drinking water treatment can value for this turbidity which may not be monitored and controlled by turbidity be exceeded. As a sum parameter for all measurement. DIN/ISO 7027 CUY22 check unit At an angle of 90°, the CUS31 turbidity CUS31/41 sensors are supplied with a sensor measures the light scattered by long-term stable factory calibration. The particles present in the water. The optical CUY22 check unit is used to verify the arrangement corresponds to the standard calibration from time to time. Its black specified in the DIN/ISO 7027 relevant to plastic body functions as light trap creating turbidity measurement. definite conditions when it is placed on the sensor head. CUS31 sensor with CUY22 check unit 4 5 Liquisys M CUM223/253 transmitter Working principle • Modes of operation: FNU, NTU, %, g/l, mg/l, ppm • Two-line display with measured value and temperature display • Optionally with 2/4 contacts (limit contacts, P(ID) controller, timer) • Optionally with Profibus PA or HART® CUS31 turbidity sensor As a highly sensitive resolution of 0.001 wiper to protect against the formation of FNU is used for measuring in drinking biofilms or other layers such as manganese, water in the fine turbidity range, the iron or lime deposits on the optics. The assembly used plays a crucial role. It must CUS31 is calibrated at the factory to create defined environmental conditions DIN/ISO 7027 and delivered as such and for the sensor to prevent disturbing effects can be put into operation immediately. The such as air bubbles and wall reflection. calibration is stable over a long term and Two different assemblies are available for is stored in such a way that it is protected this purpose and can be ordered with the from overwriting. In every operating mode, sensor. The “S-assembly” has a patented two additional data records are available gas bubble trap. However, if no air bubbles which can be edited by customers if they Patented are present in the fluid, the cheaper “E- want customised calibration. The CUY22 gas bubble trap assembly” can be used. As an additional check unit is used to check the sensor. option, CUS31 can be supplied with a Working principle of turbidity measurement based on the scattered light method Turbidity particles scatter the infrared light emitted which is then received by two photo receivers. A reference LED compensates fluctuations of intensity of the light source. 4 5 Turbidity and solids measurement in wastewater In the area of wastewater, turbidity and treatment plant outlets, turbidity and solids measurement are used in a wide solids sensors help monitor and control variety of applications. From primary the processes. In industry too, they also sludge removal and sludge dewatering monitor the dirt loads passed into the to activated sludge basins and sewage drain channels. Sludge level • CUM750 Solids Sludge level • CUS70 Sludge level • CUM740 Sludge level • CUM750 • CUM750 Solids • CUS65-A • CUC101 • CUS70 • CUS70 • CUM223/253 • CYY105 • CUS41 Sewage • CUA451 treatment Thickener plant inlet Dewatering Disposal Secondary Primary clarification Sludge activation clarification Solids • CUM223/253 Thickener • CUS41 Solids Solids • CUA451 • CUM223/253 • CUM223/253 • CUS41 • CUS41 Turbidity • CUA451 • CUA451 • CUM223/253 • CUS41-W Outlet • CYY105 CUS41 turbidity and solids sensor With a measuring range of 0.00 to 9999 CUS65 turbidity and solids sensor FNU or 0.0 to 300 g/l suitable for all The CUS65 sensor works using the applications, the CUS41 is a universal 4-beam alternating light method. The sensor for sewage treatment plants and advantage of this method is the fact that it is for the industrial sector. Like the CUS31, not sensitive to any of the aeration systems it measures at a 90° scattered light angle used in sewage treatment which can using infrared light. The wavelength of affect the accuracy of the sensor. Similarly, 860 nm used means that the sensor is contamination of the optics and ageing insensitive to the effects of colour or dye of the two light sources is automatically from the fluid. For turbidity measurement, compensated by the measuring principle. the CUS41 is calibrated at the factory in The sensor body is made of stainless steel. conformity with DIN/ISO 7027 and can As a result, no electric charges can lead be used immediately. However, if the client to material becoming attached to the wants to perform solids measurement in sensor surface even if used in flocculation g/l or %, a simple menu-guided 3-point processes. Various sensor heads are calibration is available which clients can use available depending on the measuring range to adapt the sensor to their fluids. required. Working principle The two LEDs in the sensor head 4-beam alternating alternately transmit a short light pulse. light method The light intensity is weakened by particles in the medium. The remaining light is detected at the two photo diodes. These measured light intensities are converted into proportional frequencies. This method compensates wearing of the light sources and soiling of optical components. 6 7 CUR4 spray head • For cleaning CUS31/CUS41 • Can be used with immersion assemblies in open channels or basins • Can be easily fitted on the sensor body Liquisys M CUM223/253 CUM740 transmitter Wall retainer for transmitter • For CUS65 immersion tubes • For CUS31/CUS41 • Modes of operation: %, g/l,