What are the factors affecting the measurement of residual chlorine
: 1 Water sample 1.1 pH value of sample water The pH value of sample water has a great influence on the measurement of residual chlorine, especially when the pH value is less than 5 or greater than 10 (as shown in Figure 1), Therefore, it should be avoided to be used in practical applications within this range. 1.2 Sample water temperature 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 and 20 °C. 1.3 Concentration of ammonium chloride in sample water In practical application, it is sometimes found that the addition of ammonia 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 filling. Usually this is due to the nitrogen in the water caused by the high concentration of ammonia, and the chlorine reacts with the ammonia nitrogen in the water to form chlorine ammonia. Since the concentration of ammonia nitrogen in the water source varies from year to year, its impact on residual chlorine measurement will also be different. 1.4 Pressure and flow Excessive pressure and excessive flow velocity will cause the electrode to respond too late and reduce the measured value. If the pressure is too low and the flow rate is too slow, the hypochlorous acid in the sample water cannot be replenished in time, and the sensitivity will decrease. Generally, the flow rate of sample water is 0.5~1L/min. The flow rate is 5~25cm/s more appropriate. 2 Sampling point and sampling pipeline The sampling point should be 10-20 times the diameter of the pipeline after the dosing point to ensure full mixing after dosing. At the same time, it should be ensured that there are no air bubbles in the pipeline that affect the measurement. Because metal pipes will be corroded after long-term use in the case of high residual chlorine, rust in the pipeline will reduce the concentration of residual chlorine, and rust adsorption on the surface of the sensor will also affect the measurement accuracy. Therefore, the material of the sampling pipeline should be selected as much as possible. Metal piping, such as ABS piping, UPVC piping, etc. The length of the sampling line should not be too long, especially when the residual chlorine meter participates in automatic dosing. When the sampling pipeline must be very long, the bypass pipeline should be installed as close as possible to the instrument, and the opening of the bypass valve should be as large as possible. At the same time, corresponding measures should also be taken in the software settings of the instrument and automatic chlorinator. I have encountered this situation twice. The residual chlorine meter of the filtered water and the residual chlorine meter of the factory water have been relatively stable, which can track the operation of the chlorinator. The test data at the water outlets of the two meters are basically consistent with the meter display, but the residual chlorine in the factory water is actually higher than that of the filtered water. After consultation, the reason is the negligence in the above installation and use. 3 Instrument settings Instrument settings usually include the following aspects: voltage, frequency, response time, pH compensation, temperature compensation, display range, output range, smoothness, alarm, key lock, etc. The correct setting is the prerequisite for the normal operation of the instrument.
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