ORP is the abbreviation of Oxidation-Reduction Potential in English, which represents the oxidation-reduction potential of the solution. The ORP value is a measure of the oxidation-reduction capacity of an aqueous solution, and its unit is mV. The ORP meter is a special instrument for testing the oxidation-reduction potential of a solution, which consists of an ORP composite electrode and a mV meter. The ORP electrode is an electrode that can absorb or release electrons on the surface of its sensitive layer. The sensitive layer is an inert metal, usually made of platinum and gold. The reference electrode is the same silver/silver chloride electrode as the pH electrode. It is the difference between the oxidation-reduction potential of the indicator electrode and the oxidation-reduction potential of the comparison electrode in the liquid, and can give a comprehensive indicator of the oxidation-reduction state of the entire system. A low ORP value indicates that the waste water treatment system has a high content of reducing substances or organic pollutants, a low concentration of dissolved oxygen, and a reducing environment is dominant. If the ORP value is high, it means that the concentration of organic pollutants in the wastewater is low, the concentration of dissolved oxygen or oxidizing substances is high, and the oxidizing environment is dominant. Traditional redox water treatment technology has shortcomings such as insufficient control conditions, waste of chemicals, and unfriendly environment. However, with the help of ORP measuring instruments, the use of ORP electrical signals as detection and control means can greatly improve the accurate control level of redox water treatment technology, thereby improving the treatment effect. The detection principle is similar to pH value. Many online pH detection instruments have a dual-channel detection method, including an ORP detection channel. In short, ORP is an important direction for the development of automatic control technology and anaerobic precision control of sewage treatment plants. It is of great significance to save energy, control the metabolic pathway of anaerobic microorganisms, and improve the treatment effect. ORP instrument features: ◆Chinese LCD display, Chinese menu operation. ◆Microcomputerization: High-performance CPU chip, high-precision AD conversion technology and SMT patch technology are used to complete multi-parameter measurement, temperature compensation, and instrument self-inspection, with high precision and good repeatability. ◆Waterproof and dustproof design: protection grade IP65. ◆Electromagnetic compatibility (EMC/RFI) design: designed and manufactured according to European standard EN50081/50082. ◆Achieving 25°C conversion: Nernst electrode slope temperature compensation, pure water and ammoniated ultrapure water 25°C conversion ◆Solution ground connection: Eliminate ground loop interference. ◆Electrode diagnosis: multiple calibration methods, E0, S query, monitoring electrode performance. ◆Automatic alarm function: The alarm signal is isolated and output, the upper and lower limits of the alarm can be set arbitrarily, and the alarm can be canceled after a delay. ◆Network function: isolated current output and RS485 communication interface; the upper and lower limits of the output corresponding to the ORP value of the current can be set arbitrarily; the hysteresis can be adjusted, and the adjustment range is (0 ~ 500mV). ◆Manual current source: convenient for recording and testing of testing devices. ◆Password management: Calibration, parameter setting and maintenance are all password-protected.
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