What is the reason why the online residual chlorine detector cannot detect residual chlorine in water

Daily swimming pool water mainly detects water temperature, turbidity, free residual chlorine, pH value, E. coli and other indicators. What is the reason why the residual chlorine detector detects the swimming pool water but cannot detect the residual chlorine content? As an effective bactericidal method, residual chlorine is dissolved in water and hydrolyzed to produce hypochlorous acid. Part of the hypochlorous acid is hydrolyzed again to produce hydrogen ions and hypochlorite in pool water with different pH. We need a chlorine detector to detect the sum of hypochlorous acid and hypochlorite in water. Free chlorine exists in the form of hypochlorous acid (HCLO) and hypochlorite ion (CLO-). Hypochlorous acid (HCLO) is very unstable and can be decomposed by absorbing visible light, and hypochlorite ion (CLO-) is very stable. The photolysis of hypochlorous acid produces hydrochloric acid and oxygen, and the oxygen volatilizes, which is why hypochlorous acid volatilizes! Oxygen atoms generated during the decomposition process have strong oxidizing power and kill bacteria and viruses by oxidizing proteins in bacteria and virus cells. When the pH is constant, the ratio of hypochlorous acid (HClo) to hypochlorite ion (CLO-) in water is fixed. That is to say, hypochlorous acid (HClo) is decomposed by light and then converted into hypochlorous acid (HClo) until it is completely consumed. Therefore, improper control of the pH value of the swimming pool water will affect the detection of the residual chlorine detector. For example, if the pool water is pool water, if the PH ratio of hypochlorous acid is too high, hypochlorous acid will be produced, and hypochlorous acid will volatilize. Application industry of online residual chlorine detector: The instrument adopts DPD method, which uses photoelectric colorimetric detection principle to replace traditional visual colorimetric method. Human error is eliminated, so the measurement resolution is greatly improved. When measuring, when the water sample to be tested is put into the DPD tablet, the water sample will turn red. Then put the water sample into the photoelectric colorimetric seat, and the meter will compare the shade of red to obtain the concentration of residual chlorine. Applicable to large, medium and small water plants and industrial and mining enterprises, food and beverage, medical and health, CDC, secondary water supply, breeding, swimming pools and other places to detect the residual chlorine concentration of domestic or industrial water, so as to control the residual chlorine in the water to meet the regulations water quality standards.
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