Outlining electromagnetic flow meters


Process monitoring of conductive liquids in a flow system commonly requires an electromagnetic flow meter to measure the revenue collection, liquid transportation, and energy conservation of a closed flow system.

Carrying out flow measurements according to this principle requires components capable of generating a magnetic field within an insulated metering tube. An electromagnetic coil applies the field to the interior of the pipe and electrodes assess the voltage of the conductive fluid as it flows through the cross-section.

This article will explore the use of electromagnetic flow meters in more detail:


Basic operating principles of an electromagnetic flow meter

An electromagnetic flow meter operates on Faraday’s Law of Induction, a fundamental principle of electromagnetism. This posits that there is a proportional interaction between the induced signal voltage of a conductor and its velocity as it flows through a magnetic field in a perpendicular direction. Assessing the signal voltage of wastewater as it flows through an electromagnetic cross-section, for example, informs observation of its actual velocity as it travels through a pipeline.

An electromagnetic flow meter is equipped with a dielectric liner material such as hard rubber or ceramic carbide. This ensures that the magnetic field is localized with extreme precision to the inner diameter of the process tube. Electrodes within the component can then accurately acquire the voltage of the conductive media as it flows through the cross-section with negligible interference from conductive metal components.

The acquisition of this data is also unaffected by temperature, pressure, density, or viscosity of the conductive media. This allows the component to assess the solid and amorphous composition of a liquid or gas flow system, enabling the detection of various contaminants.


Electromagnetic Flow Meters from ABB

ABB is an industry-leading supplier of process-control equipment for an extensive range of industries. We provide over 60 electronic flow meters with distinct measurement methodologies, including mass flow, thermal mass, and variable area flow meters.

Our electromagnetic flow meters are divided into two distinct categories: process industry; and water treatment mag flow meters. This range includes:

  • ProcessMaster FEP630, a reliable electromagnetic flowmeter for process control in thermal applications including the chemical, industrial waste, and pulp and paper industries. Fluid temperature capacities range up to 180°C (356°F), and the component’s diagnostic capacities include conductivity measurement and gas bubble monitoring.
  • HygienicMaster FEH500, an enhanced electromagnetic flowmeter designed specifically for diagnostics of food and beverage, pharmaceutical, and biotechnical flow processes.
  • WaterMaster FEW530, an electromagnetic flowmeter for linear magnetics measuring in water and waste water applications. A maximum impulse error output of within 0.4% of the measured value is guaranteed following advanced calibration.
  • Aquamaster FEW400, a comprehensive solution for a range of electromagnetic flow measurements including rate, velocity, volume, and pressure with an accuracy up to +/- 0.2%.


If you would like any more information about our electromagnetic flow meters, contact us below.

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