Which is better dissolved oxygen meter

Which is the best dissolved oxygen meter? Many friends ask questions when they use the dissolved oxygen meter on site. Let me first introduce the dissolved oxygen meter to you. Continuous monitoring of dissolved oxygen, saturation, oxygen partial pressure and temperature in the solution. Oxygen content is an important indicator in the water treatment process. Real-time measurement can reflect the effect of water treatment in time. Online dissolved oxygen meter can realize real-time dissolution in water. Oxygen determination brings a more intuitive experience to people, and fully replaces the previous experience processing. Dissolved oxygen meters are widely used in industries such as thermal power, chemical fertilizers, metallurgy, environmental protection, pharmaceuticals, and biochemicals.　　1. Principle of Dissolved Oxygen Measurement 　　The cathode for measuring dissolved oxygen in water by polarography is a gold or platinum electrode, and the anode is a silver electrode (Ag/AgCl reference electrode). The electrolyte is KCl solution, and the DC power supply voltage is 0.65~0.85 V. When the anode material is changed to lead and the electrolyte is changed to KOH solution, it is the Gavanic method. Compared with the polarographic method, the Gavanic method has a faster oxidation reaction of the anode lead, so the test reading is faster and does not require polarization. It is mostly used for general laboratory analysis. Pay attention to frequent maintenance during use. Polarography must be polarized before use, but it does not require frequent maintenance. It is especially suitable for online dissolved oxygen meter selection for continuous processes. 2. Select the sensor part of the online dissolved oxygen meter: The key part of the selection of the dissolved oxygen meter is the sensor. Because it is measured by the current method, and the output signal is relatively small, there are more requirements for the manufacturing process of dissolved oxygen, and a slight deviation will cause The signal output error is relatively large, so when choosing a dissolved oxygen sensor, you need to pay special attention to the sensor with a good manufacturing process; 　　 Transmitter part: There is a good sensor, then the transmitter part is mainly used to collect the signal of the sensor , For signal processing and transmission, the signal processing of the transmitter needs to be very strict in the process of signal amplification and transmission, otherwise it will cause a large error in the final measurement data.　　 3. On-line dissolved oxygen measuring instrument electrode maintenance 　　 The correctness of the measured value of the instrument has a great relationship with the measuring electrode. Therefore, in the entire measurement system, the maintenance of the dissolved oxygen electrode is a key point.　　 (1) If it is found that the entire measurement system has a long response time, membrane rupture, current increase in oxygen-free medium, etc., maintenance work such as replacing the membrane head and adding electrolyte is required. The maintenance work for membrane replacement and electrolyte addition is about once every six months. After each membrane replacement or electrolyte addition, the electrode needs to be re-polarized and calibrated.　　(2) Treatment of gold cathode After the oxygen electrode has been used for a period of time, if a small amount of brown appears on the surface of the gold cathode, remove the membrane holder, clean it with distilled water and dry it, and gently rub the gold surface with metallographic sandpaper 005 or above for polishing. After polishing, rinse with distilled water to install the membrane holder (if there is no distilled water, you can replace it with pure water). (3) Cleaning the surface of the electrode membrane: If the anti-pollution Teflon membrane is contaminated, use gauze dipped in a small amount of dilute detergent to gently wash it, or install a water jet cleaning device to automatically clean the surface of the dissolved oxygen measurement electrode membrane. . At present, there are many manufacturers of dissolved oxygen meters on the market, and Kaidi is one of the manufacturers dedicated to the production of dissolved oxygen meters. Kaidi has been committed to product quality and customer service. Kaidi has set up about 20 offices across the country. Serve customers around the clock. Which dissolved oxygen meter is better? Choose Kaidi
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