A new type of flow measuring instrument developed rapidly with the development of electronic technology, which is made according to Faraday's law of electromagnetic induction and is used to measure the volume flow of conductive fluid. Although the electromagnetic flowmeter has the above-mentioned excellent characteristics, it still has some shortcomings, so that it is limited in use.
The main points are as follows:
1. Electromagnetic flowmeters cannot be used to measure gases, vapors, and liquids containing large amounts of gas.
2. The electromagnetic flowmeter cannot be used to measure the liquid medium with low conductivity. The conductivity of the liquid medium to be tested cannot be lower than 10-5 (S/cm), which is equivalent to the conductivity of distilled water. For petroleum products or organic Solvents and so on are still powerless.
3. Due to the temperature limitation of the measuring tube insulation lining material, the current industrial electromagnetic flowmeter cannot measure high temperature and high pressure fluid.
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, the electromagnetic flowmeter must also have a certain length of straight pipe before and after.
5. The electromagnetic flowmeter is susceptible to external electromagnetic interference.
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