The online residual chlorine
meter has been calibrated by DPD method at the factory. If the measured value is found to be inaccurate during use, it is necessary to re-zero and calibrate the instrument. 1. For zero adjustment, add about 1 ml of deionized water into the colorimetric tube, then add 1 piece of DPD residual chlorine rate test reagent tablet, soak for 1 minute, crush it with a clean glass rod (accessory) to fully dissolve, and then add Chlorine water to the 10ml mark and shake well, dry the water stains on the glass surface of the colorimetric tube with a roll paper and put it into the colorimetric seat of the instrument, align the scale line on the measuring cell of the instrument and cover it with a light-shielding cover. Quickly adjust the 'zero adjustment' potentiometer on the rear panel of the instrument within 4-5 minutes after adding the DPD reagent, so that the display is 0.00mg/L. 2. Calibration Add about 1 ml of 2.5mg/L--DPD method residual chlorine standard solution into the colorimetric tube, then add a piece of DPD residual chlorine speed test reagent tablet, soak for 1 minute, crush and dissolve with a clean glass rod, Add 2.5mg/L--DPD residual chlorine standard solution to the 10ml scale, dry the water stains on the glass surface of the colorimetric tube with roll paper and put it into the colorimetric seat of the instrument, and align it with the scale on the measuring pool of the instrument line and put on the light-shielding cap. Quickly adjust the 'calibration' potentiometer on the rear panel of the instrument within 4-5 minutes after adding the DPD reagent, so that the display is 2.50 mg/L. Note: When the o-toluidine reagent method is used for measurement, the user should prepare the potassium dichromate residual chlorine standard solution and the use solution by himself, and the instrument can only be used after calibration. For the configuration method and use of the standard solution, please refer to the GB/T Standard Test Method for Drinking Water. The residual chlorine meter is a precision measurement instrument combined with photoelectricity. Before operation, you should read the instructions carefully and operate correctly to obtain accurate measurement results. Requirements for the use of online residual chlorine meter: 1. The use environment must meet the working conditions. 2. The measuring tank must be clean and dry for a long time without dust, and the shading cover must be covered when not in use. 3. If it is used in humid climate, the start-up time must be extended accordingly. 4. The solution to be tested should be poured carefully along the wall of the sample bottle to prevent air bubbles from affecting the measurement accuracy. 5. After replacing the sample bottle or standard solution and after maintenance, it must be re-calibrated. 6. When the word 'LOBAT' of low voltage is displayed on the upper left corner of the display, the battery should be replaced in time to avoid affecting the measurement. 7. After adding the DPD reagent, the whole test should be completed within 4-5 minutes, otherwise the test result may be inaccurate. During the test, the scale line on the colorimetric bottle should be aligned with the scale line on the test seat of the instrument and pressed to the bottom (the interior is positioned by a steel ball). 8. Non-professional maintenance engineers, please do not open the instrument for maintenance. The online residual chlorine meter can be divided into free residual chlorine and combined residual chlorine: The online residual chlorine meter is divided into free residual chlorine and combined residual chlorine according to the form and disinfection activity. Free residual chlorine: also known as Cl2, HOCl, OCl-, etc. in the free chlorine aqueous solution are free residual chlorine, which is a residual chlorine component with good anti-virus effect and strong oxidizing ability in water, and is generally used in sanitation and swimming pool water quality control. Free residual chlorine is used to measure whether the residual chlorine of water quality is up to standard. Combined residual chlorine: When ammonium (amine, ammonia) exists in water, chlorine will react with ammonium to produce chloramine (monochloramine, dichloramine, trichloramine). The bactericidal effect of chloramine is far weaker than that of hypochlorous acid, and it has an odor. Unwelcome ingredient in swimming pools. However, since the stability of chloramine is much stronger than that of free residual chlorine, in order to achieve long-term bactericidal effect, a certain amount of chloramine in the tap water supply system has a positive effect. Free residual chlorine and combined residual chlorine are collectively referred to as total residual chlorine. The detection methods of residual chlorine include iodometric method, DPD colorimetric method, DPD drop lake method, OTO colorimetric method (because it can cause bladder cancer, it has been banned in the United States, Europe and Australia, and China's drinking water standards have also banned the use this method) and the electrical method. Since residual chlorine solutions are extremely unstable, rapid on-site testing is recommended. The main features of the online residual chlorine meter are: 1. Microcomputer, LCD backlit liquid crystal display, light touch keyboard, easy to use. 2. Microcomputer data processing, the instrument has built-in 5-point calibration, and users can calibrate 10 more points by themselves. 3. The system can restore factory settings with one key, and users who do not have a laboratory do not need to worry about calibration, and it is truly maintenance-free. 4. USB interface, can store 300 data. 5. Full Chinese concentration direct reading, historical record query, real-time clock display. 6. Advanced positioning structure and high-precision optical path system effectively ensure the accuracy and repeatability of the measured values. 7. Its reliable linear compensation system makes the measurement data more accurate and more stable. 8. Using high-quality imported integrated circuits and photoelectric detection components, it has high overall stability. 9. The performance of the instrument is stable, the resolution is high, and the resolution of the instrument reaches 0.001mg/L. The online residual chlorine meter adopts a modular design and is widely used. The basic transmitter provides simple measurement and alarm functions, and the extended function software and modularization can be applied to special occasions. If necessary, expansion modules can be used. At present, this product has been widely used in electric power, water supply, medicine, chemical industry, food and other industries to continuously measure residual chlorine in water.
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