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Online Residual Chlorine Analyzer
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Shanghai BOQU Instrument Co., Ltd
Shanghai, China
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What is residual chlorine?
Residual chlorine is the low-level amount of chlorine remaining in the water after a certain period or contact time after its initial application. It constitutes an important safeguard against the risk of subsequent microbial contamination after treatment—a unique and significant benefit for public health.
Chlorine is a relatively cheap and readily available chemical that, when dissolved in clear water in sufficient quantities, will destroy most disease-causing organisms without being a danger to people. The chlorine, however, is used up as organisms are destroyed. If enough chlorine is added, there will be some left in the water after all the organisms have been destroyed, this is called free chlorine. (Figure 1) Free chlorine will remain in the water until it is either lost to the outside world or used up destroying new contamination.
Therefore, if we test the water and find that there is still some free chlorine left, it proves that most dangerous organisms in the water have been removed and it is safe to drink. We call this measuring the chlorine residual.
Measuring the chlorine residual in a water supply is a simple but important method of checking that the water that is being delivered is safe to drink

Model No CL-2059S&P
Output 4-20mA
Protocol Modbus RTU RS485
Power Supply AC220V or DC24V
Model CLG-2059S/P
Measurement configuration Temp/residual chlorine
Measuring range Temperature 0-60℃ Residual chlorine analyzer 0-20mg/L（pH：5.5-10.5）
Resolution and accuracy Temperature Resolution: 0.1℃ Accuracy: ±0.5℃ Residual chlorine analyzer Resolution: 0.01mg/L Accuracy: ±2% FS
Communication Interface 4-20mA /RS485
Outlet 10mm
Cabinet size 600mm×400mm×230mm（L×W×H）
Power supply AC 85-265V
Total power 30W
Inlet 6mm
Water flow 15L-30L/H
Working Environment Temp：0-50℃；

  • Monitoring of chlorine disinfection treatment water such as swimming pool water, drinking water, pipe network, and secondary water supply, etc.
  • Wastewater, river water, swimming pool

1. The integrated system can measure residual chlorine and temperature                      
2. With the original controller, it can output RS485 and 4-20mA signals                       
3. Equipped with digital electrodes, plug, and use, simple installation and maintenance 

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