What is an electromagnetic flowmeter

Electromagnetic flowmeter is a kind of flowmeter designed by Faraday principle. It can measure conductive liquid with impurities. It not only has the characteristics of high precision, low maintenance cost and durability, but also can measure conductive liquid with impurities. , has brought convenience to the majority of users and various large enterprises. Next, let’s introduce in detail what is an electromagnetic flowmeter. What is an electromagnetic flowmeter: The measurement principle of an electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. The measuring tube of the flowmeter is a short tube of non-magnetic permeable alloy lined with insulating material. Two electrodes pass through the pipe wall along the pipe diameter and are fixed on the measuring pipe. Its electrode head is basically flush with the inner surface of the lining. When the excitation coil is excited by the double-wave pulse, it will generate a working magnetic field with a magnetic flux density B 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 will be induced by cutting the magnetic lines of force. The electromotive force E is proportional to the magnetic flux density B, which is the product of the inner diameter d of the measuring tube and the average flow velocity v. The electromotive force E (flow signal) is detected by the electrode 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. E=KBdv where: E---------------is the signal voltage (v) between the electrodes B------------------magnetic Flux density (T)d------------------Inner diameter of measuring tube (m)v------------------Average In the flow velocity (m/s) formula, k and d are constants. Since the exciting current is a constant current, B is also a constant. From E= 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 is linearly related to the volume Q. Therefore, as long as E is measured, the flow Q can be determined, which is the basic working principle of the electromagnetic flowmeter. It can be seen from E=KBdv that parameters such as temperature, density, pressure, conductivity of the measured flow medium, and the liquid-solid composition ratio of the liquid-solid two-phase fluid medium will not affect the measurement results. As for the flow state, as long as it conforms to the axisymmetric flow (such as laminar flow or turbulent flow), it will not affect the measurement results. Therefore, the electromagnetic flowmeter is a real volume flowmeter. For manufacturers and users, as long as they are actually calibrated with ordinary water, they can measure the volume flow of any other conductive fluid medium without any correction. This is an outstanding advantage of the electromagnetic flowmeter, which is not available in any other flowmeter. 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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