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Relative to the ultrasonic flowmeter analysis of electromagnetic flowmeter related problems

by:Kaidi Sensors     2021-12-23
The electromagnetic flowmeter works according to the principle of Faraday's law of electromagnetic induction. When a conductive conductor cuts the magnetic field lines in a magnetic field, induced electromotive force will be generated upstream and downstream, and the direction is in accordance with the right-hand rule. Therefore, the application of general electromagnetic flowmeters has certain requirements on the conductivity of the fluid, and 5us/cm is used as the dividing line in the application process. Electromagnetic flowmeters and ultrasonic flowmeters are all velocity flowmeters, and all the factors affecting their accuracy include: fluid flocculation (whether the fluid is evenly distributed), and lining internal scale. Error caused by fluid flocculation: when the liquid velocity V in the pipeline is distributed axially symmetrically, and in a uniform magnetic field, the electromotive force generated on the flowmeter electrode has nothing to do with the fluid velocity distribution, but is proportional to the average fluid velocity Otherwise, the induced electromotive force generated by the electrode will be different. Therefore, the electromagnetic flowmeter must be installed in the measuring pipe section with the smallest possible fluid flow rate turbulence to avoid unnecessary errors. Errors caused by lining internal scale: In chemical companies, water treatment companies, and metering instruments for daily domestic water, we often see a layer of scale or chemical pollution attached to the inner wall. Don’t underestimate this thin layer, it can Change the electromotive force deviation of the electromagnetic flowmeter, and then cause the zero point misalignment. Therefore, we often see some sewage treatment plants, in order to improve their measurement accuracy, often clean the electrodes inserted into the electromagnetic flowmeter. For now, electromagnetic flowmeters still play a leading role in the fluid metering, energy-saving testing and other industries. With the improvement of electronic chip technology and computer computing efficiency, they are gradually being replaced by ultrasonic flowmeters.
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