Electromagnetic flowmeter applications and advantages, suitable for use in which industry

　　1. Electromagnetic flowmeter is a volume flow measuring instrument. During the measurement process, it is not affected by the temperature, viscosity, density and conductivity (within a certain range) of the measured medium. Therefore, the electromagnetic flowmeter can be used to measure the flow of other conductive liquids after being calibrated with water without the need for additional corrections.

　　Second, the transmitter of the electromagnetic flowmeter has a simple structure, no moving parts, and no throttling parts that hinder the flow of fluid, so when the fluid passes through, it will not cause any additional pressure loss, and it will not cause problems such as wear, blockage, etc. It is particularly suitable for measuring liquid-solid two-phase fluids such as ore slurry with solid particles, sewage, and various slurries with high viscosity. Similarly, since it has no moving parts in its structure, it can be made of corrosion-resistant insulating linings and corrosion-resistant materials to make electrodes, which has good corrosion resistance and can be used to measure various corrosive media.

　　3. The electromagnetic flowmeter has no mechanical inertia, is sensitive to reaction, can measure instantaneous pulsating flow, and has good linearity. Therefore, the measurement signal can be directly converted into a standard signal output by a converter, which can be indicated locally or transmitted over long distances.

　　4. The electromagnetic flowmeter has a very wide measuring range, and the measuring range ratio of the same electromagnetic flowmeter can reach 1:100. In addition, the electromagnetic flowmeter is only proportional to the average flow velocity of the measured medium, and has nothing to do with the flow state (laminar flow or turbulent flow) under axisymmetric distribution.

　　Although the electromagnetic flowmeter has the above-mentioned excellent characteristics, it still has some shortcomings, which limits its use. The main points are as follows:

　　1. Electromagnetic flowmeters cannot be used to measure gas, steam, and liquids containing large amounts of gas.

　　2. Electromagnetic flowmeters cannot currently be used to measure liquid media with very low conductivity. The conductivity of the measured liquid medium cannot be lower than 10-5 (S/cm), which is equivalent to the conductivity of distilled water. It is still powerless for petroleum products or organic solvents.

　　3. Since the insulation lining material of the measuring tube is subject to temperature limitations, the current industrial electromagnetic flowmeter cannot measure high-temperature and high-pressure fluids.

　　4. The electromagnetic flowmeter is affected by the flow velocity distribution. Under the condition of axisymmetric distribution, the flow signal is proportional to the average flow velocity. Therefore, there must be a certain length of straight pipe section before and after the electromagnetic flowmeter.

　　5. Electromagnetic flowmeter is susceptible to external electromagnetic interference.