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Factors Affecting the Measurement of Online Residual Chlorine Detector

by:BOQU     2023-03-30
The film-covered electrode of the online residual chlorine detector uses gold as the cathode and silver/silver chloride as the anode. The electrode is filled with an electrolyte with ideal pH value and stable conductivity, which is separated from the measured liquid by a layer of selective permeable membrane (PTFE). During the measurement, the instrument applies a stable voltage to both ends of the electrodes, the residual chlorine (hypochlorous acid and hypohydrogen ion) in the measured solution diffuses through the residual hydrogen film, the cathode accepts electrons, and the anode releases electrons to generate current. This current is directly proportional to the rate at which residual chlorine diffuses to the cathode, that is, ultimately proportional to the concentration of residual chlorine in the solution to be measured. Residual chlorine refers to the water that has been chlorinated and disinfected. After a certain period of contact, in addition to the consumption of a part of the chlorine by the action of bacteria, microorganisms, organic matter, and inorganic matter in the water. The remaining part of the chlorine is called residual chlorine. Several factors that affect the measurement of the online residual chlorine detector: 1. The pH value of the sample water The pH value of the sample water has a great influence on the measurement of residual chlorine, especially when the pH value is <5 or>10. 2. Temperature of sample water The temperature of sample water has a certain influence on the measurement of residual chlorine. It is generally believed that the measured value will increase by about 5 for every 1°C increase in temperature. The ideal water sample temperature should be between 15-20°C. 3. Ammonium chlorine concentration in sample water In practical application, it is sometimes found that the amount of chlorine added increases, but the residual chlorine in the sample water decreases, and when it increases again, the residual chlorine increases again. This is what we often call breakpoint chlorine addition. Usually this is caused by the high concentration of ammonia nitrogen in the water, and the chemical reaction between chlorine gas and ammonia nitrogen in the water to produce chlorine ammonia. 4. Pressure and flow rate Excessive pressure and too fast flow rate will cause the electrode to respond too late and reduce the measured value. If the pressure is too small and the flow rate is too slow, the hypochlorous acid in the sample water will not be replenished in time and the sensitivity will be reduced.
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