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Measuring principle of electromagnetic flowmeter

Author:vacorda    Source:vacorda.com    Date: 2016-12-30 15:58:57

Intelligent electromagnetic flowmeter is esearched and developed by our factory using the most advanced technology at home and abroad, and it’s converter core using high-speed central processing unit. With fast calculation speed , high precision and the reliable measuring performance.

electromagnetic flow meter

Intelligent electromagnetic flowmeter

Working principle of turbine flow meter measurement principle is based on the Faraday law of electromagnetic induction. Measurements of the flow meter tube is lined with insulating material of a non-magnetic alloy spool. Two clicks along the diameter through-wall fixing on the measuring tube. The electrode head is flush with the lining inner surface. Field coil by waves when pulsed excitation by both parties, will be measured perpendicular to the pipe axis direction produces a magnetic flux density of the magnetic field b. At this point, if you have some electrical conductivity of fluid flows through the measuring tube, cut magnetic lines of induction electromotive force E.  Electromotive force e is proportional to the magnetic flux density B, measure the inside diameter d and the product of the mean velocity v. Electromotive force e (traffic signal) checked out by electrodes and cables to the converter. Converter after the traffic signal will be amplified, to display fluid flow and energy output pulse, analog current signals for flow control and the flow adjustment.




E-for signal voltage between the electrodes (v)

B--magnetic flux density (t)

d--measuring tube diameter (m)

v--average flow velocity (m/s)

working principle of electromagnetic flow meter

When measuring the flow rate, the conductive liquid flows at a velocity V through a magnetic field perpendicular to the flow direction, The flow of the conductive liquid induces a voltage proportional to the average flow rate, the induced voltage signal detected through two or more electrode direct contact with the liquid, and sent to the converter by the cable and through intelligent processing, then show LCD display or converted to standard signal 4-20mA and 0-5kHz output.


Electromagnetic flowmeter is suitable for measuring the volume flow of conductive liquid and slurry in closed pipeline, such as clean water, sewage, various of acid and alkali solution, slurry, pulp and so on.

Guanghua Rd, Qingyang Dist, Chengdu, Sichuan Province, China