Excitation classification of electromagnetic flow meter

Abstract: The information on the excitation classification of electromagnetic flowmeters is provided by excellent flowmeter and flowmeter manufacturers. To generate a uniform and constant magnetic field, it is necessary to select a suitable excitation method. If divided by the way of excitation current, there are DC excitation, AC (power frequency or other frequency) excitation, low frequency rectangular wave excitation and dual frequency rectangular wave excitation. A. DC excitation. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the excitation classification of electromagnetic flowmeters. To generate a uniform and constant magnetic field, it is necessary to select a suitable excitation method. If divided by the way of excitation current, there are DC excitation, AC (power frequency or other frequency) excitation, low frequency rectangular wave excitation and dual frequency rectangular wave excitation. A. DC excitation The DC excitation method uses direct current or uses a permanent magnet to generate a constant uniform magnetic field. The biggest advantage of this DC excitation transmitter is that it is little affected by the interference of the AC electromagnetic field, so the influence of the self-inductance phenomenon in the liquid can be ignored. However, the use of a DC magnetic field is easy to polarize the electrolyte liquid passing through the measuring pipe, that is, the electrolyte is electrolyzed in the electric field to generate positive and negative ions. Negative electrodes are respectively surrounded by ions of opposite polarity, which seriously affects the normal operation of the instrument. Therefore, DC excitation is generally only used to measure non-electrolyte liquids, such as liquid metal flow (mercury at normal temperature and liquid steel, lithium, potassium at high temperature), etc. B. The electromagnetic flowmeters used in the AC excitation industry mostly use the power frequency (50Hz) power supply AC excitation method to generate an alternating magnetic field, which avoids the polarization interference on the surface of the DC excitation electrode. But using AC excitation will bring a series of electromagnetic interference problems (such as quadrature interference, in-phase interference, zero drift, etc.). AC excitation is now being replaced by low frequency square wave excitation. C, low frequency square wave excitation The low frequency square wave excitation waveform has two values ​​(positive-negative) and three values ​​(positive-zero-negative-zero), and its frequency is usually 1/2~1/32 of the power frequency. Low-frequency square wave excitation can avoid the orthogonal electromagnetic interference of the AC magnetic field, eliminate the power frequency interference caused by the distributed capacitance, suppress the eddy current caused by the AC magnetic field in the tube wall and inside the fluid, and eliminate the polarization phenomenon of the DC excitation The above is the whole content of this article. , You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Electromagnetic Flow Meter Excitation Classification Detailed Explanation'

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