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Principle and product characteristics of electromagnetic water meter

by:Sure     2021-08-24
The working principle of electromagnetic water meters is based on Faraday's law of electromagnetic induction. The measuring tube of the flowmeter is a short non-magnetic alloy tube lined with insulating material. Two electrodes are fixed on the measuring tube through the tube wall along the tube diameter direction. The electrode tip is basically flush with the inner surface of the lining. When the excitation coil is excited by a two-way square 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 will be induced by cutting the magnetic field lines. The electromotive force E is proportional to the product of the magnetic flux density B, the inner diameter of the measuring tube d 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 pulses, analog current and other signals for flow control and adjustment. In Figure 1-1, when the conductive fluid flows through an insulating tube with an inner diameter of D (m) equipped with a pair of measuring electrodes at an average flow velocity V (m/s), and the tube is at a uniform magnetic induction intensity of B(T) in the magnetic field. Then, an electromotive force (E) perpendicular to the direction of the magnetic field and the flow direction will be induced on a pair of electrodes. According to the law of electromagnetic induction, it can be written as (1) formula: circuit working principle diagram 1. Shell 2. Lining 3. Excitation coil 4. Converter 5. Grounding screw 6. Electrode Huahai Measurement and Control of the water meter electromagnetic flowmeter product features 1 .The instrument structure is simple and reliable, without moving parts, and has a long working life. 2. There is no blocking and flow blocking parts, and there is no pressure loss and fluid blockage. 3. No mechanical inertia, fast response, good stability, can be applied to automatic detection and adjustment program control system. 4. The measurement accuracy is not affected by the type of the measured medium and its temperature, viscosity, pressure and other physical parameters. 5. Separately designed seals at the connection between the sensor and the meter can prevent external moisture from entering the meter and sensor from the connection. 6. Both the excitation wire and the electrode wire adopt high-quality single-core shielded wires, which can reduce interference, improve signal cleanliness, and improve measurement accuracy. 7. Wide measuring flow range. For more product details, please click the official website of Huahai Measurement and Control: www.ehuahai.com Service Hotline: 400-828-5048
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