In the water treatment industry, accurate flow measurement at every stage—from raw water intake and chemical dosing to sludge transport—directly affects treatment performance, operating costs, and regulatory compliance. As the “eyes” of process control, flow meters are critical to system optimization. Among the various technologies available, the flow meter electromagnetic solution has become the industry standard.
What is a Magnetic Water Flow Meter？
An electromagnetic flow meter consists of two parts: a sensor and a converter. The sensor comprises a measuring tube, electrodes, an excitation coil, an iron core, and a housing. The converter amplifies, processes, and calculates the flow signal, displaying instantaneous flow and cumulative flow, and outputting pulse and analog current signals for fluid flow measurement and control. The EM02 series electromagnetic flowmeter uses an intelligent converter, which not only has measurement and display functions but also supports remote data transmission, wireless remote control, and alarm functions.
Electromagnetic Flow Meter Working Principle
According to Faraday’s principle of electromagnetic induction, a pair of detection electrodes is 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 the value is proportional to the flow rate. Its value is
E=KBVD
In the formula:
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;(Measuring the inner diameter of the tube).
The sensor uses the induced potential E as a flow signal, which is transmitted to the converter. After amplification, transformation, filtering, and a series of digital processing, the instantaneous and cumulative flow rates are displayed on a back-lit dot matrix LCD. The converter has 4-20mA output, alarm output, and frequency output, and is equipped with communication interfaces such as RS-485, and supports HART and MODBUS protocols.
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Flow Meter Electromagnetic Application in Wastewater
A wastewater treatment plant in South Korea, with a total treatment capacity of 160,000 m³/d, has widely adopted electromagnetic flow meters across critical process stages—including influent metering, reclaimed water reuse, sludge treatment (e.g., thickening tanks, pre- and post-dewatering), as well as the influent and effluent measurement of all biochemical units, aeration tanks, and sedimentation tanks. Installed and calibrated in 2021, the magnetic water flow meters have been operating stably up to now.
Wondering Whether This Electromagnetic Flow Meter is the Right Solution for your Application?
Our engineers will recommend the most suitable model based on your specs and budget.
Types of Electromagnetic Flow Meters
A diverse range of Flow Meter Electromagnetic is available, with each model engineered to suit distinct applications, operating environments, and fluid media. Feel free to contact us for tailored product guidance and support.
Boasting high-precision measurement, superior operational stability, and time-tested engineering reliability, electromagnetic water flow meters have become the preferred solution for flow measurement in wastewater treatment and various other industries. Even under harsh operating conditions, these devices deliver consistent and reliable performance with minimal maintenance costs.
Our team of seasoned application engineers is on hand to provide customized electromagnetic flow meter solutions tailored to your specific requirements. Please feel free to contact us anytime if needed.
