The residual chlorine meter is an online residual chlorine analysis instrument. It is composed of a residual chlorine sensor and a residual chlorine meter. It can measure residual chlorine and temperature at the same time. It is widely used in electric power, water supply, medicine, chemical industry, food and other industries. Chlorine is measured continuously. 1. The instrument has been calibrated by the factory before leaving the factory and does not require user calibration. 2. The user should use the free chlorine (total chlorine) DPD reagent provided by the manufacturer when measuring the instrument. 3. If the temperature of the water sample is lower than 15°C, it should be preheated to above 15°C after adding the medicine (wrap the sample cell with a layer of paper and shake it with your hands), until the medicine is completely dissolved, and then measure. 4. Sampling samples must be analyzed immediately and cannot be saved for later analysis. 5. When the sample cell is inserted into the sample cell slot, the sample cell must be correctly positioned and locked (the sample cell is placed in the sample cell slot, so that the triangular mark on the bottle cap is aligned with the triangular positioning mark on the instrument) to prevent stray light Enter. After the sample cell is installed in the sample cell tank, it should be kept still for at least 30 seconds (to allow the air bubbles in the sample to be eliminated and the solid particles to settle) before measurement. 6. After one measurement (residual chlorine or total chlorine measurement), the sample cell must be thoroughly cleaned before using the same sample cell for another measurement. 7. The sample cell and bottle cap must be cleaned immediately after measurement to prevent contamination and corrosion of the sample cell. 8. If solid or solution enters the sample cell, it must be cleaned up before being put into the sample cell. When the 'READ' key is pressed continuously, if the reading increases or the reading is unstable (nearly before '- - - L' appears), it means that the battery voltage is insufficient, and the battery should be replaced and measured again. 9. The standardization of the time used to control each step is crucial to improving the precision of the determination. The color development can be stable for about 5 minutes at a concentration of 0.5 mg/L, and the color development can be stable for about 2 minutes at a concentration of 2.0 mg/L. 3.0 The color development at a concentration of about mg/L can be stable for about 1 minute. 10. When the concentration of the measured water sample is greater than the measuring range of the instrument, the reading of the instrument will overflow and cannot be read. At this time, the water sample to be tested should be diluted to an appropriate concentration with distilled water or deionized water for measurement. Large-screen dot-matrix liquid crystal display, Chinese menu operation. Simultaneous display of multiple parameters can be realized: residual chlorine value, hypochlorous acid value, PH value, temperature, output current, etc. are displayed simultaneously, intuitive and easy to read, and there is a prompt for range overrun. The bactericidal principle of chlorine-based disinfectants is to hydrolyze to form free hypochlorous acid monomers (after chlorine is injected into water in the form of simple substance or hypochlorite, it will be hydrolyzed to generate free available chlorine, including chlorine gas, hypochlorous acid and hypochlorite. Forms such as acid salt ions, collectively referred to as residual chlorine), uncharged hypochlorous acid monomers can enter the bacteria through the cell membrane, and oxidize with protein substances and nucleic acids in the bacteria, causing bacterial metabolic disorders and killing bacteria. The higher the concentration of hypochlorite, the stronger the bactericidal ability. According to the research, it is proved that hypochlorous acid and hypochlorite ions mainly exist when the pH is close to neutral. When the residual chlorine dose gradually increased from 0.1 mg/L to 3.0 mg/L, the pH value of the wastewater was controlled at about 7.5, and when the residual chlorine dose reached 1.0 mg/L, the COD
and BOD removal rates began to decline; when the toxic dose reached 1.5 mg/L At L, the number and form of protozoa did not change significantly, and the removal rates of COD and BOD dropped to 39% and 69% respectively; The body disintegrated and protozoa died in large numbers. The residual chlorine value in this study is based on the traditional activated sludge method. For sewage treatment plants that require denitrification, it cannot be simply considered that 1.0mg/L residual chlorine in the influent will have an impact on the system. The effect of upper internal reflux (generally control r=200 or more) can be tolerated for the influent residual chlorine of sewage treatment plants with denitrification process not greater than 2mg/L. The portable residual chlorine detector
can be used to detect the following data: 1. Chromaticity: Most people can detect the chromaticity of drinking water if it is greater than 15 degrees, and people feel disgusted when it is greater than 30 degrees. The standard stipulates that the color of drinking water should not exceed 15 degrees. 2. Turbidity: It is an expression of the optical properties of water samples. It is used to express the degree of clarity and turbidity of water. It is one of the important indicators to measure the good degree of water quality. important basis. The reduction of turbidity means that the content of organic matter, bacteria, viruses and other microorganisms in the water body is reduced, which can not only improve the disinfection and sterilization effect, but also help reduce the generation of halogenated organic matter. 3. Residual chlorine: Residual chlorine refers to the amount of chlorine remaining in the water after the water has been chlorinated and disinfected for a certain period of time. The continuous bactericidal ability in water can prevent the self-pollution of water supply pipelines and ensure the quality of water supply. 4. Chemical oxygen demand (COD): refers to the amount of oxygen required by chemical oxidants to oxidize organic pollutants in water. The higher the chemical oxygen demand, the more organic pollutants in the water. Organic pollutants in water mainly come from the discharge of domestic sewage or industrial wastewater, and the rotting and decomposition of animals and plants into water bodies. The residual chlorine online detector uses a series of analytical techniques to ensure the stability, reliability and accuracy of the instrument's long-term work. With Chinese menu operation, RS485 communication and other functions. It can be used in drinking water treatment plants, drinking water distribution networks, swimming pools, cooling circulating water, water quality treatment projects, etc. to continuously monitor and control the residual chlorine content in aqueous solutions.
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