Problems that should be paid attention to in implementing the specification of residual chlorine detector

Residual chlorine refers to the effective chlorine remaining in water after the water has been chlorinated for a certain period of time. The residual chlorine detector is usually used in food and beverage, medical and health, CDC, tap water, secondary water supply, swimming pool, breeding and other industries. Residual chlorine refers to the residual chlorine in the water after the water has been chlorinated for a certain period of time. There are three forms of residual chlorine: free residual chlorine, combined residual chlorine and total residual chlorine. Residual chlorine is a routine test item in water quality testing. In addition to drinking water, the state also has strict regulations on the discharge of total residual chlorine in hospital sewage. The residual chlorine detector has the characteristics of accurate quality, high sensitivity and convenient use. Therefore, this type of instrument is widely used in water plants, hospitals, and sanitation systems, and plays an important role in water quality monitoring. However, there are currently neither industry nor national standards for the calibration of such instruments. Each testing laboratory calibrates such instruments by self-calibration. The technical requirements, calibration conditions, calibration items, calibration methods and calibration results are handled differently. The purpose of formulating calibration specifications for residual chlorine detectors is to provide technical basis for the calibration of such instruments, improve the quality of residual chlorine detection, establish a traceability system for residual chlorine detection values, and effectively evaluate instrument performance. The instrument provides a basis for accurate monitoring of residual chlorine in water. Provide guarantees for laboratories engaged in such instrument testing to better provide objective, comparable and effective testing data for scientific research, social and economic construction and development. Issues that should be paid attention to in the implementation of residual chlorine detector specifications: 1. Selection of terminology and measurement units 2. Principles of determination of measurement characteristics 3. Principles of standard substance selection Simulate the experimental research process of free chlorine and total residual chlorine standard substances for determination of measurement characteristics . These two reference materials are certified reference materials issued by Shanghai Institute of Metrology and Testing Technology, which are easy to obtain and have traceability. Appropriate standard materials can be selected according to actual operation requirements. During the calibration process, the operation instructions of the residual chlorine meter should be strictly followed, and the measurement can only be carried out after adding the supporting color reagent. 4. Uncertainty evaluation of indication error Taking the total residual chlorine and free residual chlorine as examples respectively, the evaluation certainty rating of indication error is given. The concentration value of the diluted standard solution is directly measured by the residual chlorine detector, and compared with the theoretical calculation result of the standard solution.
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