• Polaris


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Polaris® Electromagnetic Flow Meter

The electromagnetic flow meter consists of a sensor through which the measured liquid flows and an electronic unit where the low-level signal from the sensor is modified to a standardised form suitable for further processing in various industrial electronic devices. The output signal is proportional to the volumetric flow rate of the measured liquid.

The only factor limiting the application of electromagnetic flow meters is the requirement that the measured liquid shall be conductive and non-magnetic.

Operating Principle

The function of an electromagnetic flow meter is based on Faraday’s law of induction. The sensor consists of a non-magnetic and non-conductive tube with two embedded measuring electrodes. To create an alternating magnetic field, two coils are fitted onto the tube in parallel with the plane defined by the active parts of the measuring electrodes. If a conductive liquid flows across the magnetic field, a voltage will appear on the measuring electrodes proportional to the flow velocity and the conductor length.


  • Water based liquids and sludge flows


  • 4-20 mA, pulse and alarm outputs
  • Liquid conductivity down to 5 µS/cm
  • Forward and reverse flow indication
  • HART with PACTware


  • Integral or remote transmitter
  • Multiple liner and electrode materials
  • Flanged or wafer style sensors
  • Grounding rings

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