Purpose of residual chlorine detector: The YL-1Z Residual Chlorine Meter is suitable for measuring the residual chlorine concentration of domestic or industrial water in large, medium and small water plants, industrial and mining enterprises, swimming pools and other places, so as to control the residual chlorine of the water to meet the prescribed water quality standards. To 2. Principle of residual chlorine detector: This instrument uses the microcomputer photoelectron colorimetric detection principle to replace the traditional visual colorimetric method. Elimination of human error, so the measurement resolution is greatly improved. 3. Technical indicators of residual chlorine detector: 1. Measurement range: 0-5 mg/L 2. Power supply voltage: 220V 3. Resolution: 0.01mg/L 4. Repeatability: 1% 5. Linear error: ±(5%FS+1 word) 4. Features: 1. Microcomputer, touch keyboard, LCD liquid crystal display numbers clearly, easy to use. 2. Using the photoelectric colorimetric principle of spectrophotometry, it is convenient to apply reagents. The water sample can be read one minute after the reagent is reacted, and the value of residual chlorine is displayed digitally. 4. The instrument stores the calibration curve in the full range, with power-off protection, the calibration data will not be lost. Automatic zero adjustment and 7-point automatic correction are available. The data has non-linear processing and data smoothing functions. The minimum reading of the meter is 0.01mg/L.