Can electromagnetic flow meters measure different types of liquid flows?

As a widely used flow measurement devices/instruments, electromagnetic flow meters are used to measure liquid flow due to their high accuracy, strong reliability and no moving parts. However, electromagnetic flow meters are not suitable for all types of liquids. Its working principle depends on the conductivity of the liquid, so different liquid types have a significant impact on the measurement effect. In this article today, our editor will analyze with you whether electromagnetic flow meters can measure different types of liquid flow, and analyze its scope of application and limiting factors.

Working Principle of Electromagnetic Flowmeter

The core principle of electromagnetic flowmeter is Faraday’s law of electromagnetic induction. When a conductive liquid passes through the pipe of the flowmeter, the electromagnetic flowmeter applies a constant magnetic field outside the pipe. The flow of the liquid cuts the magnetic lines of force and generates an induced voltage proportional to the flow rate. This voltage signal is converted into a flow value by the transducer. Since this principle is based on the conductivity of the liquid, the scope of application of the electromagnetic flowmeter is closely related to the conductivity of the liquid.

Applicable Liquid Types

Electromagnetic flowmeters are most suitable for conductive liquids such as water, sewage, acid and alkali solutions, and saline solutions, because these liquids can effectively interact with magnetic fields to generate induced voltages, thereby achieving high-precision measurements. What’s more, the minimum conductivity of conductive liquids required for accurate measurements is typically＞5μS/cm.

Electromagnetic flow meters cannot measure non-conductive liquids, such as oils and some organic solvents, as they do not provide the requisite electrical conductivity. In cases where measurement of such fluids is necessary, ultrasonic or turbine meters are recommended.

Conclusion

The primary considerations in using electromagnetic flow meters are the requirement for the liquid to be conductive and meet the conductivity minimum threshold. Therefore, electromagnetic flow meters are often the first choice for water flow measurement. Magnetic flowmeters play a pivotal role in water treatment facilities and municipal applications, ensuring effective processes, and maintaining quality across various applications.

Micro Sensor is committed to providing high-precision electromagnetic flowmeter and flow measurement solutions, serving water treatment, chemical, food and other industries, and helping efficient and accurate flow monitoring.


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