Try searching by key words, order- or product code or serial number e.g. “CM442” or “Technical information”
Enter at least 2 characters to start the search.

The electromagnetic flow measuring principle

For measuring conductive fluids, even with entrained solids

Video Multiple industries 03.12.2024

Faraday’s law of induction states that a metal rod moving in a magnetic field induces electrical voltage. This dynamo principle also governs the way electromagnetic flowmeters work.

As soon as the electrically charged particles in a fluid cross the artificial magnetic field generated by two field coils, an electric voltage is induced. This voltage, tapped by two measuring electrodes, is directly proportional to the velocity of flow and thus to the flow volume. The magnetic field is generated by a pulsed direct current with alternating polarity. This ensures a stable zero point and makes the flow measurement insensitive to multiphase or inhomogeneous liquids, as well as low conductivity.

Watch the video to learn how the electromagnetic flow measuring principle works and read more about it here!

Advantages of electromagnetic flowmeters at a glance

  • The measuring principle is virtually independent of pressure, density, temperature and viscosity
  • Even fluids with entrained solids can be metered, e.g., ore slurry or cellulose pulp
  • Wide range of nominal diameters: DN 2 to 3000 (1/12 to 120")
  • Free pipe cross-section: CIP/SIP cleanable, piggable
  • No moving parts
  • Minimum outlay for maintenance and upkeep
  • No pressure losses
  • Very high turndown up to 1000:1
  • High degree of measuring reproducibility and long-term stability

Our electromagnetic flowmeters

Events & Training