Electromagnetic flowmeter GF | Working principle of electromagnetic flowmeter

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What is the principle of electromagnetic flowmeter?

The electromagnetic flowmeter works based on Faradays law of electromagnetic induction, and its core principle is to calculate the flow rate by measuring the induced voltage generated by cutting magnetic lines in a conductive medium.. The specific process is as follows:

1. Magnetic field generation and induced voltage generation. The measuring tube is equipped with an excitation coil, which generates a constant magnetic field perpendicular to the pipeline axis (magnetic flux density B) after being energized. When a conductive medium (such as a liquid) flows through a pipeline, its direction of motion is perpendicular to the direction of the magnetic field, which is equivalent to the conductor cutting magnetic field lines. According to Faradays law of electromagnetic induction, an electromotive force E is induced in a conductive medium, which is proportional to the magnetic flux density B, the inner diameter profile d of the measuring tube, and the average fluid velocity v. The formula is: E=K × B × d × v, where K is the instrument constant determined by the electrode spacing and pipeline structure. Two electrodes are symmetrically installed on the inner wall of the measuring tube for signal detection and transmission to detect the induced electromotive force E. Due to the direct contact between the electrodes and the fluid, and the use of non-conductive lining materials (such as rubber and Teflon) in the measuring tube, electromagnetic isolation is achieved, avoiding corrosion of the electrodes by the fluid while ensuring signal accuracy. The detected voltage signal is transmitted to the converter through a cable. The signal processing and output

converter uses a microcontroller (MCU) and surface mount technology (SMT) to amplify, filter, and linearize weak voltage signals, converting them into digital or analog signals proportional to the flow rate. The output forms include instantaneous flow rate, cumulative slag lifting capacity, flow rate and other parameters. It supports 4-20mA current signal, pulse signal or RS485 communication, which is convenient for remote monitoring and automation control. 4. Structural advantages and applicability: There are no obstructive flow components (such as valves such as valves and blades) inside the measuring tube, so there is no additional pressure loss and no movable parts, and the service life is extremely long. The induced voltage is the average value of the pipeline cross-section, and the required straight pipe section is relatively short (usually 5 times the pipe diameter). By selecting corrosion-resistant electrodes (such as titanium and tantalum) and lining materials, strong acid, strong alkali, high viscosity liquids, and liquid-solid two-phase flows can be measured, which are widely used in fields such as chemical engineering, environmental protection, metallurgy, etc.

5. Bidirectional measurement and stability electromagnetic flow meters can distinguish between forward and reverse fluid flow, and achieve flow accumulation through a bidirectional measurement system. Its sensor only comes into contact with the measured liquid, and with high-quality materials and special processes, ensures long-term stability, small zero drift, and measurement accuracy is not affected by changes in fluid density, temperature, and pressure.

Electromagnetic flowmeter GF | Working principle of electromagnetic flowmeter

What is the principle of electromagnetic flowmeter?

2. Can GF electromagnetic flowmeter be used in sludge dewatering system?

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