An electromagnetic flowmeter is an inductive instrument that measures the volumetric flow of a conductive medium in a pipe according to Faraday's law of electromagnetic induction. Structurally, the electromagnetic flowmeter consists of a sensor that directly contacts the pipeline medium and an upper signal converter. Now it has been widely used in chemical industry, environmental protection, metallurgy, medicine, papermaking, water supply and drainage and other industrial technology and management departments.
The main advantages of electromagnetic flowmeter
(1) The output of the electromagnetic flowmeter is only proportional to the average flow velocity of the measured medium, but is independent of the flow state (laminar flow or turbulent flow) under symmetrical distribution. Therefore, the range of the electromagnetic flowmeter is very wide, with a range ratio of up to 20:1, and some even reach a 100:1 turndown ratio.
(2) The scope of industrial electromagnetic flowmeters is very wide, from a few millimeters to several meters, and there are real-time flow calibration devices with caliber up to 3m in China, laying the foundation for the application and development of electromagnetic flowmeters.
(3) The sensor structure of the electromagnetic flowmeter is simple, there are no moving parts inside the measuring tube, and there are no throttling parts that impede the flow of the fluid. Therefore, when the fluid passes through the flow meter, it does not cause any additional pressure loss, and is one of the lowest energy consumption flow meters in the flow meter.
(4) The electromagnetic flowmeter has no mechanical inertia and is sensitive to reaction. It can measure instantaneous pulsating flow, and can also measure flow in both positive and negative directions.
(5) Measure the flow of dirty media, corrosive media and suspended liquid-solid two-phase flow. This is due to the unobstructed flow components inside the instrument measuring tube. The measuring tube lining and electrodes are in contact with the measured fluid. The material can be selected according to the nature of the measured fluid. For example, with polytrifluoroethylene or PTFE as the inner lining, it can measure various corrosive media such as acids, alkalis, and salts; wear-resistant rubber as the inner lining is particularly suitable for measuring wear with solid particles. Larger slurry, cement slurry, etc. Liquid-solid two-phase flow, and various suspended liquids with fiber liquids and pulps.
(6) Electromagnetic flowmeter is a kind of volume flow measuring instrument. In the measurement process, it is not affected by the measured temperature, viscosity, density of the medium (in a certain range). Therefore, after the electromagnetic flow meter is calibrated by water, it can be used to measure the flow of other conductive liquids.
The main shortage of electromagnetic flowmeter
(1) It cannot be used to measure gases, steam, and liquids containing large amounts of gas.
(2) Cannot be used to measure liquid media with very low conductivity. Such as the petroleum products or organic solvents and other media, electromagnetic flowmeters are still powerless.
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