Electromagnetic flow meter scale excitation classification fine solution

Abstract: the electromagnetic flow meter scale excitation classification of thin solution information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. To produce a uniform constant magnetic field, it needs to choose a suitable way of excitation. If divided according to the field current mode, dc field, ac ( Power frequency and other frequency) Excitation, low-frequency rectangular wave excitation and dual-band rectangular wave excitation. 一个。 Dc excitation. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electromagnetic flowmeter scale excitation classification of fine article details. To produce a uniform constant magnetic field, it needs to choose a suitable way of excitation. If divided according to the field current mode, dc field, ac ( Power frequency and other frequency) Excitation, low-frequency rectangular wave excitation and dual-band rectangular wave excitation. 一个。 Dc excitation dc excitation method with direct current (dc) or by * magnet produces a constant homogeneous magnetic field. The dc excitation zui big advantage of the transmitter is affected by the ac electromagnetic interference is very small, so can ignore the influence of self-induction phenomenon of liquid. But using dc magnetic field is easy to make by measuring the electrolyte fluid of the pipe is polarized, the electrolyte by electrolysis in the electric field, produce positive and negative ions, in under the action of electric field force, ran to the anode, anion cation ran to the negative pole, this will lead to positive and negative electrodes were surrounded by ions of opposite polarity, seriously affect the normal work of the instrument. So, dc excitation only commonly used for measuring the liquid electrolyte, such as liquid metal flow ( Under the room temperature of mercury and the high temperature of liquid steel, lithium, potassium) And so on. B。 Ac excitation on the industrial use of electromagnetic flowmeter, mostly by power frequency ( 50Hz） Ac excitation power supply way to produce alternating magnetic field, to avoid the dc excitation on the surface of the electrode polarization interference. But the use of ac excitation will bring a series of electromagnetic interference problem ( For example orthogonal interference, in-phase interference, zero drift, etc. ) 。 Ac excitation is now replaced by low frequency square wave excitation. C, low frequency square wave excitation frequency square wave excitation waveform has two values ( Is - Negative) And three values ( Is - Zero - Negative - Zero) Two, the frequency of power frequency usually 1/2 ~ 1/32. Low frequency square wave excitation can avoid orthogonal electromagnetic interference of ac magnetic field, power frequency interference caused by distributed capacitance, inhibition of ac magnetic field within the tube wall and fluid caused by eddy current, eliminate dc excitation polarization phenomenon above is all there is in this article, you are welcome to inquire me factory flowmeter selection, quotation, etc.

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