electromagnetic flow sensor

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1. A detailed introduction to the working principle of electromagnetic flow meters is not difficult to understand. Electromagnetic flow meters (EMF) are a new type of flow measurement instrument that rapidly developed with the development of electronic technology in the 1950s and 1960s. Below is an introduction to the principle and characteristics of electromagnetic flow meters for your reference.

First, the working principle of electromagnetic flowmeter. Electromagnetic flowmeter is a flowmeter that measures flow according to Faradays law of electromagnetic induction.

. The advantages of electromagnetic flowmeter are minimal pressure loss and a wide range of measurable flow rates. The ratio of maximum flow rate to minimum flow rate is generally above 20:1, suitable for a wide range of industrial pipe diameters, up to 3m. The output signal is linear with the measured flow rate, with high accuracy. It can measure the fluid flow rate of acid, alkali, salt solutions, water, sewage, corrosive liquids, as well as mud, slurry, pulp, etc. with conductivity ≥ 5 μ s/cm. But it cannot measure the flow of gas, steam, and purified water. When a conductor cuts magnetic field lines in a magnetic field, an induced potential is generated in the conductor, and the magnitude of the induced potential is proportional to the effective length of the conductor in the magnetic field and the speed at which the conductor moves perpendicular to the direction of the magnetic field. Similarly, when a conductive fluid flows vertically in a magnetic field and cuts magnetic induction lines, it will also generate induced potentials on the electrodes on both sides of the pipeline. The direction of the induced potential is determined by the right-hand rule, and the magnitude of the induced potential is determined by the following equation: Ex=BDv ------------------------- Equation (1), where Ex - induced potential, V; B - magnetic induction intensity, T D - inner diameter of the pipeline, m v - average flow velocity of the liquid, m/s. However, the volumetric flow rate qv is equal to the product of the flow velocity v of the fluid and the cross-sectional area of the pipeline (π D ²)/4. Substituting equation (1) into this equation, Qv=(π D/4B) * Ex ---------------- Equation (2) shows that when the pipeline diameter D is fixed and the magnetic induction intensity B remains constant, the measured volumetric flow rate is linearly related to the induced. If an electrode is inserted on each side of the pipeline, an induced potential Ex can be introduced, and the magnitude of this potential can be measured to obtain the volumetric flow rate. According to Faradays principle of electromagnetic induction, a pair of detection electrodes are installed on the tube wall perpendicular to the axis of the measuring tube and the magnetic field lines. When the conductive liquid moves along the axis of the measuring tube, it cuts the magnetic field lines and generates an induced potential. This induced potential is detected by the two detection electrodes, and its value is proportional to the flow rate. Its value is E=B · V · D · K, where E - induced potential; K - Coefficient related to magnetic field distribution and axial length; B-Magnetic induction intensity; V-average flow velocity of conductive liquid; D-electrode spacing; The sensor (measuring the inner diameter of the tube) uses the induced potential E as the flow signal, which is transmitted to the converter. After s

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