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Electromagnetic Flow Meter

Functional principle of electromagnetic flowmeter

LCD Display
Medium with conductive rate
No moving parts for low maintenance & long life

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Functional principle of electromagnetic flowmeter

    The electromagnetic flowmeter is composed of a sensor and a converter. It is a velocity meter for measuring the volume flow of conductive media. Its principle is based on Faraday’s law of electromagnetic induction, which is mainly used to measure the volume flow of conductive liquids such as water, sewage, wastewater, paper pulp, mud, etc. This flowmeter is widely used in industrial water, urban sewage treatment systems, environmental protection and other industries. 


1. Measuring principle:

Inside the electromagnetic flowmeter there is an electromagnetic coil that generates a magnetic field, and an electrode for capturing electromotive force (voltage). According to Faraday's law of induction, a conductive liquid flowing in a magnetic field generates an electromotive force (voltage), which is proportional to the inner diameter of the pipe, the strength of the magnetic field, and the average flow velocity. In other words, the flow rate of liquid flowing in a magnetic field is converted into electricity. (E is proportional to V×B×D)

2. Features:


・Not affected by the temperature, pressure, density or viscosity of the liquid

・Can detect liquids containing contaminants (solids, bubbles)

・No pressure loss

・No moving parts (improve reliability)


・Cannot detect non-conductive gases and liquids

・Need a short straight pipe

3. Matters needing attention

Since the electromagnetic flowmeter is based on Faraday's law of electromagnetic induction, it can only detect the flow of conductive liquids. Whether the liquid conducts electricity depends on the conductivity. The conductivity of conductive liquids that can be detected by general electromagnetic flowmeters

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Why can water conduct electricity?

Water (H2O) itself is a stable molecule and cannot conduct electricity. The secret of water conductivity lies in the presence of impurities in the water. In addition to H2O (water molecules), water also contains Ca2+ (calcium ions) and Mg2+ (magnesium ions) plasmas. Because these ions conduct electricity in the water, tap water, groundwater, and other ion-rich water all have conductive properties. Pay special attention to the fact that pure water only contains H2O without any impurities, so it cannot conduct electricity.


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