The working principle of the instrument electromagnetic flowmeter
to measure mud The measurement principle is based on Faraday's law of electromagnetic induction. The measuring tube of the flowmeter is a short tube of non-magnetic conductive alloy lined with insulating material. Two electrodes are fixed on the measuring tube through the tube wall along the diameter of the tube. Its electrode tip is substantially flush with the inner surface of the liner. When the excitation coil is excited by the double-wave pulse, a working magnetic field with a magnetic flux density of B will be generated in the direction perpendicular to the axis of the measuring tube. At this time, if a fluid with a certain conductivity flows through the measuring tube. The electromotive force E is induced by the cutting magnetic field lines. The electromotive force E is proportional to the magnetic flux density B, and the product of the inner diameter d of the measuring tube and the average flow velocity v is measured. The electromotive force E (flow signal) is detected by the electrodes and sent to the converter through the cable. After the converter amplifies the flow signal, it can display the fluid flow, and can output pulse, analog current and other signals for flow control and regulation. Eu003dKBdv where: E---------------is the signal voltage between electrodes (v) B-------magnetic Flux density (T) d------------------measuring tube inner diameter (m) v------------------average Flow velocity (m/s) In the formula, k, d are constants. Since the excitation current is constant, B is also a constant. From Eu003d KBdv, it can be known that the volume flow Q is proportional to the signal voltage E-, that is, the signal induced by the flow velocity The voltage E has a linear relationship with the volume Q. Therefore, the flow rate Q can be determined as long as E is measured, which is the basic working principle of the electromagnetic flowmeter. It can be known from Eu003dKBdv that the parameters such as temperature, density, pressure, electrical conductivity, and liquid-solid composition ratio of the liquid-solid two-phase fluid medium to be measured will not affect the measurement results. As for the flow state, as long as it conforms to axisymmetric flow (such as laminar flow or turbulent flow), it will not affect the measurement results. Therefore, the electromagnetic flowmeter is a volume flowmeter. For manufacturers and users, the volume flow of any other conductive fluid medium can be measured without any correction as long as it is actually calibrated with ordinary water. This is an outstanding advantage of electromagnetic flowmeters, which is not found in any other flowmeters. There are no moving and blocking parts in the measuring tube, so there is almost no pressure loss and high reliability.
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