Factors Affecting the Measurement of Residual Chlorine Detector

The residual chlorine detector is an instrument for rapid detection of residual chlorine. The instrument is equivalent to a small spectrophotometer. After the water sample is reacted with a special reagent, the residual chlorine/total chlorine value is calculated by the spectrophotometric method. The characteristic of the residual chlorine detector is that the reagents required for the detection process are designed into a special reagent package, and the instrument itself also contains a standard curve. Users do not need professional knowledge to prepare reagents and curves, and can accurately detect within a few minutes. The content of residual chlorine can be very convenient for enterprises to quickly monitor the content of residual chlorine in water. There are many factors that will affect the operation and accuracy of the instrument in the measurement. The main factors are summarized below: 1. Water sample 1. The pH value of the water sample: the pH value of the water sample is within the range of less than 5 or greater than 10. The measurement of residual chlorine has a great influence, and should be avoided in this range in practical applications; 2. The temperature of the water sample: it is generally believed that the measured value will increase by about 5% when the temperature rises by 1°C. The temperature of the water sample should be between 15 and 20°C; 3. The concentration of ammonium chloride in the water sample: In practical application, it will be found that the residual chlorine in the water sample will decrease when the amount of chlorine added increases, and it will increase again when it is increased. It is what we often say to add chlorine at breakpoints. This is caused by the high concentration of ammonia nitrogen in water, and the chemical reaction between chlorine gas and ammonia nitrogen in water. The concentration of ammonia nitrogen in water sources will vary throughout the year, so the impact on the measurement of residual chlorine is also 4. Pressure and flow rate: Too high or too low pressure, too fast or too slow flow rate will make the hypochlorous acid in the water sample not be replenished in time and reduce the sensitivity. 2. Sampling point The sampling point should be 10~20 times the diameter of the pipeline after the dosing point to ensure that the chlorine gas is fully mixed after dosing, and at the same time, it should be ensured that there will be no air bubbles in the pipeline that will affect the measurement. 3. Sampling pipeline 1. Metal pipelines will be corroded when used for a long time in the case of high residual chlorine. The rust in the pipeline will reduce the concentration of residual chlorine. At the same time, the rust adsorption on the surface of the sensor will also affect the measurement accuracy. Therefore, the sampling pipeline The material should try to use non-metallic pipelines; 2. The length of the sampling pipeline should not be too long. If it has to be very long, a bypass pipeline should be installed as close as possible to the residual chlorine detector, and the bypass valve should be as close as possible to the residual chlorine detector. 3. Corresponding measures should be taken in the software settings of the residual chlorine detector and automatic chlorinator.
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