How to choose electromagnetic flow meter

Abstract: The information on how to choose the electromagnetic flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Electromagnetic flowmeter is a kind of pipeline flowmeter for measuring conductive liquid. It has the characteristics of low flow resistance, no moving parts and high measurement accuracy. The above picture is the basic structure of electromagnetic flowmeter. Huaian Runtai Instrument Co., Ltd. Li The measurement principle of electromagnetic flowmeter is. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on how to choose electromagnetic flowmeters. Electromagnetic flowmeter is a kind of pipeline flowmeter for measuring conductive liquid. It has the characteristics of low flow resistance, no moving parts and high measurement accuracy. The above picture is the basic structure of electromagnetic flowmeter. The measurement principle of Huaian Runtai Instrument Li electromagnetic flowmeter is based on Faraday's law of electromagnetic induction: when a conductive object moves in a magnetic field, the conductor cuts the magnetic field line, and induced electromotive force is generated at both ends of the conductor. The magnitude of the induced electromotive force is related to the length of the conductor, the magnetic induction intensity and The speed of the conductor is proportional to the movement speed, that is: how to choose an electromagnetic flowmeter In an electromagnetic flowmeter, a conductive coil is used to generate a magnetic field, the conductive liquid is the conductor, the measuring electrode is used to detect the induced electromotive force, and the inner diameter of the pipe is the length of the conductor , a certain current is applied to the coil to generate a stable magnetic field, so the flow speed of the conductive liquid can be known by measuring the induced electromotive force, and the flow rate can be calculated. Electromagnetic flowmeters have a very wide range of applications and are used in all walks of life. It can measure clean water, sewage, acid, alkali, chemical raw materials with conductive ions, etc. The diameter range of the measuring pipe of the electromagnetic flowmeter is very wide. The smallest known inner diameter can be 1 mm, and the largest can be 3 meters. When choosing an electromagnetic flowmeter, it is first necessary to determine whether the fluid can conduct electricity. Second, it should be considered whether the fluid is corrosive. If it is corrosive, it is necessary to put forward corrosion resistance requirements for the lining material. Generally, acid-resistant rubber and polytetrafluoroethylene have better corrosion resistance, while natural rubber, neoprene and polyurethane rubber have poor corrosion resistance. Third, consider the temperature of the fluid. PTFE has the widest temperature range, from -80°C to +150°C. Polyurethane rubber can only withstand temperatures below 40°C, and other rubbers generally do not exceed 80°C. Fourth, consider whether the fluid contains particulate impurities. Particles will wear the inner wall of the pipe, and the wear resistance of the lining material needs to be considered. Polyurethane rubber has the best wear resistance among lining materials, and neoprene is also good, and other materials are relatively weak. Fifth, consider the environmental conditions of the installation site. The electromagnetic flowmeter's resistance to electromagnetic field interference is relatively weak, which is determined by its working principle, so when there is strong electromagnetic wave interference nearby, or when there are substations and transformer centerline grounding piles near the pipeline, it is not suitable. Install the electromagnetic flowmeter. Sixth, it is necessary to consider the matching and economy of flow and pipeline. It is best to keep the flow velocity above 0.5m/s in the pipeline, because the lower the flow velocity, the weaker the induced electromotive force, the more inaccurate the flow meter is, and the easier it is to be disturbed. Generally, if you need to consider saving the energy consumption of pipeline transportation, the economic flow rate is generally 2m/s to 3m/s. The higher the flow rate, the faster the fluid transportation speed, but the energy consumption increases with the square relationship of the flow rate. Therefore, when the flow rate is too low, the pipeline should be reduced to increase the flow rate; when the flow rate is too high and the process has no special requirements, the pipeline can be expanded to reduce the flow rate. Seventh, avoid soaking the electromagnetic flowmeter in water as much as possible. Long-term soaking in water, the sensor of the electromagnetic flowmeter is prone to moisture, and the measurement performance will be degraded or even damaged. The advantages of electromagnetic flowmeters make the selection very easy, but the price of electromagnetic flowmeters on the market is uneven, and the performance is also uneven, which makes it difficult for users to choose suppliers. Although the manufacturing technology of electromagnetic flowmeters is relatively mature, good electromagnetic flowmeters need good technology, process and equipment support. To judge the quality of the electromagnetic flowmeter, you can first observe it from the appearance. First, look at the welding surface. The electromagnetic flowmeter shell and flange welding surface with good process guarantee usually have good flatness. On the contrary, if the welding surface has obvious unevenness and unevenness, it is reasonable to doubt the performance of the flowmeter. Poor welding not only affects the appearance, but also affects the sealing performance. In addition to causing leakage, it may also cause the coil to be damp due to poor sealing. Seriously. It will cause the flange welded end to crack under the action of fluid pressure. The second is to look at the lining, and judge the performance of the flowmeter by observing the smoothness and cylindricity of the lining. The smoothness and cylindricity of the lining of the flowmeter with good technology are good, and there is no obvious lining processing seam. On the contrary, the lining processing quality is poor, and the performance of the flowmeter will be affected. The third is to look at the surface paint,The spray quality of the protective paint on the surface of the flowmeter also has a good reference value. The surface of a good flow meter is uniform and firm in color, and it is not easy to peel off. Otherwise, you should be vigilant.

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