PH measuring instrument

There are two types of PH value measuring instruments: experimental and online. With the vigorous development of the national economy, the frequency of using such products in industry or scientific research units has become more and more widespread, and the requirements for such products have become more stringent. The editor today will share with you about the PH automatic tester.　　PH: 　　 Hydrogen ion concentration index (hydrogen ion concentration) refers to the ratio of the total number of hydrogen ions in the solution to the total amount of substances. It is generally called 'pH'PH' describes the degree of acidity and alkalinity of the aqueous solution, expressed by the pH value. In the thermodynamic standard condition, the aqueous solution with pHu003d7 is neutral, pH<7 is acidic, and pH>7 is alkaline.　　The pH range is between 0 and 14, which is only suitable for dilute solutions. The pH of a solution with a hydrogen ion concentration or a hydroxide ion concentration greater than 1mol/L is directly expressed as a concentration. After you have a basic concept, I can introduce it to you-PH/ORP tester is one of the intelligent online chemical analysis instruments, which is widely used in thermal power, chemical fertilizers, metallurgy, environmental protection, pharmaceuticals, biochemicals, food Continuous monitoring of PH value or ORP value and temperature in solutions such as tap water. This controller can be used in conjunction with various electrodes.　　 PH automatic measuring instrument, currently on the market is mostly an online multi-function controller to use the electrode corresponding to the occasion, it is extremely smart and convenient to use, in popular terms, the electrode is immersed in the measured solution. Pay special attention to electrode selection. The electrode itself is a consumable, and its material structure is relatively fragile. It is necessary to clarify the composition of the solution on the north side. Key parameters and specifications of the acid-base tester: 　　 1. Confirm the use occasion and medium 2. Measure the temperature of the medium 3. Corrosive 4. The specific city of the medium 5. Installation method 6. The signal and function of the corresponding controller output are used on the electrode Please pay special attention before: 　　 remove the electrode protective cap, align the instrument interface and rotate it clockwise gently to tight (excessive force is not available), turn on the power switch, insert the electrode into the measured solution, the instrument displays the pH value of the solution. To lock the number, set the switch to lock the reading. After the measurement is completed, turn off the power, release the lock, remove the electrode, and put on the electrode protective cover (the protective cover contains potassium chloride protective solution). 2. Instrument standard: The instrument has been calibrated when it leaves the factory. In case of re-activation after being left unused for a long time or in other cases where calibration is required, calibrate before measurement. Refer to the instruction manual '4. Instrument Standards' for the calibration method. Regarding the technical indicators of the controller: 　　n can be set to isolate and transmit 4-20 mA output, the maximum loop is 750Ω, 0.1%FS 　　n measurement range: PH(0-14 pH); ORP(-1000-+1000 mV or ( -2000-+2000 mV))　　n accuracy: ±0.02 pH; ±1mV　　n resolution: ±0.01 pH; ±1mV　　n stability: ≤0.02 pH/24H; ≤3 mV/24H　　n input impedance: ≥10^12 n Temperature measurement range: 0-100°C, accuracy: ±0.5°C, NTC 10K　　 n temperature compensation: 0-100°C manual/auto nRS485 function, compatible with standard MODBUS RTU communication protocol n power supply: AC220V±10%, 50Hz or DC 24V　　n alarm relay AC250V, 3A　　 can be matched with a variety of electrodes, suitable for different working conditions. Conventional plastic shell electrodes can be applied to most sewage occasions; desulfurization electrodes are suitable for lime slurry solutions in the wet desulfurization industry; high temperature glass electrodes are suitable for high temperature occasions, and can be used with plastic shell sheaths or PTFE sheaths; pure water electrodes Suitable for pure water occasions. How to choose electrodes for specific site conditions can be consulted by online engineers. Application: 　　 Generally in medium and large sewage treatment plants. In the 1990s, some foreign imported brands, such as E+H, Mettler, Hash, etc., were mainly used. With the improvement of domestic industrial water products, some domestic manufacturers have gradually entered this market. For example, Kaidi has done a good job in environmental protection and has one-stop service, which has been recognized by a large number of customers and peers.