What is an electromagnetic flowmeter? The electromagnetic flowmeter is a kind of flowmeter designed by the Faraday principle. It can measure conductive liquid with impurities. It not only has the characteristics of good accuracy, low maintenance cost, and durability, but it can also measure conductive liquid with impurities. It has brought convenience to the majority of users and various large enterprises. Next, let us introduce in detail what is an electromagnetic flowmeter.
What is an electromagnetic flowmeter:
The measurement principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. The measuring tube of the flowmeter is a non-magnetic alloy short tube lined with insulating material. The two electrodes pass through the pipe wall and are fixed on the measuring pipe along the pipe diameter direction. Its electrode tip is substantially flush with the inner surface of the liner. When the excitation coil is excited by a double-wave pulse, a working magnetic field with a magnetic flux density B in a direction perpendicular to the axis of the measuring tube will be generated. At this time, if a fluid with a certain conductivity flows through the measuring tube. 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 tube and the average velocity v is measured. The EMF (flow signal) is detected by the electrodes and sent to the converter via a cable. After the converter amplifies the flow signal, it can display the fluid flow, and can output pulses, analog current and other signals for flow control and adjustment.
E = KBdv
In the formula: E --------------- is the signal voltage between electrodes (v)
B ----------------- magnetic flux density (T)
d ------------------ Inner diameter of measuring tube (m)
v ------------------ average velocity (m / s)
In the formula, k and d are constant. Since the excitation current is constant, B is also constant. From E = KBdv, we can know that the volume flow rate Q is proportional to the signal voltage E-, that is, the flow rate-induced signal voltage E and the volume Q are Linear relationship. Therefore, as long as E is measured, the flow rate Q can be determined, which is the basic working principle of the electromagnetic flowmeter.
It can be known from E = KBdv that parameters such as temperature, density, pressure, electrical conductivity, and liquid-solid composition ratio of liquid-solid two-phase fluid medium will not affect measurement results. As for the flow state, as long as it conforms to axisymmetric flow (such as laminar or turbulent flow), it will not affect the measurement results. Therefore, the electromagnetic flowmeter is a medium volume flowmeter. For manufacturers and users, the volume flow rate of any conductive fluid medium can be measured after actual calibration with ordinary water without any correction. This is a prominent advantage of electromagnetic flow meters, which is not available in any flow meter. There are no moving and blocking parts in the measuring tube, so there is almost no pressure loss and high reliability.
What is an electromagnetic flowmeter The above is a detailed introduction to electromagnetic flowmeters. If you have any questions, please contact our technical engineers or log on to our website to learn more about flowmeters.
