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Electromagnetic flow meters

Electromagnetic flow meters measure the volume flow of conductive liquids in a closed pipe. They enable bidirectional flow measurement with high accuracy in a wide range of flow velocities (0.025 to 10 m/s). The minimum required conductivity of the measured medium is 5 μS/cm. The evaluation unit allows to display the measured values on the display and to change a large number of operating parameters of the meter using the keyboard. They are used in water, water industry, energy, food, chemical and petrochemical industries and other industries.

Main advantages of electromagnetic flow meters:

  • High measurement accuracy over a wide range of measured values

  • High reliability and stability with minimal maintenance requirements

  • Bidirectional measurement
  • No hydraulic losses in the pipeline

  • Compliant with sanitary standards

  • Possibility of remote transmission of measured data

  • ATEX / IECEx certificate (type FLONEX FXx11x)

Use of electromagnetic flow meters

Thanks to their advantages and versatility, electromagnetic flow meters are suitable for measurement in almost all industries, especially water, chemical, petrochemical, food (sanitarians) and energy industries. They are also applied to the measurement of liquids containing solid parts or non-homogeneous mixtures. For special measurement of liquids with abrasive particles, it is convenient to use an electromagnetic flow meter with a special stone lining. Electromagnetic flow meters meet demanding requirements on accuracy, reliability and long-term stability of measurements. They allow the measurement of the medium flow in both directions. The measurement of the medium flow takes place in a contactless manner, without mechanical moving parts and does not affect the hydrodynamic conditions in the pipeline in any way.

Measurement principle

The function of electromagnetic flowmeter is based on the Faraday induction law. The meter sensor consists of a non-magnetic electrically non-conductive tube and two inbuilt electrodes that pick up the induced voltage in a plane perpendicular to the direction of the magnetic power lines. The magnetic field is generated by electric current flowing through two coils wound on the tube. The flow of the conductive liquid through the tube gives rise to induced voltage U proportional to the magnetic induction B, flow velocity v and the length of the virtual conductor l:

u = B x l x v


  • u = induced voltage
  • B = magnetic induction
  • l =  distance between the measuring electrodes
  • v = flow velocity of the measured liquid
For the given sensor size, the values of magnetic induction and distance between electrodes are constant. Therefore, the voltage induced on the electrodes is proportional to the velocity of the liquid flowing through the sensor tube. The volume flow rate Q is then the product of the liquid flow velocity v and the tube cross-section S:  
Q = v × S

Displayed 7 items
  • FLONET FN20xx.1

    Flow measurement of conductive liquids in pipes from DN6 up to DN1200 (1/4" to 48"), in almost all branches of industry, especially in the water industry, in the chemical and food industry or in energy.

  • FLONET FH30xx

    Flow measurement of conductive liquids in pipes from DN15 up to DN1200 (3/4" to 48") in almost all industries and energy. It uses the RS485/MODBUS RTU communication line.

  • FLONET FN50xx.2

    The electromagnetic flow meter without display as a flow meter part of systems for measuring heat or cold of conductive liquids in pipes to DN800 (32"), or in other simple technological applications of liquid flow measurement.

  • FLONEX FXx11x

    Flow measurement of conductive liquids in the chemical and petrochemical industry in pipes from DN15 to DN300 (1/2" to 12"), with ATEX / IECEx certificate and RS485/MODBUS RTU protocol.

  • FLONET FS10xx

    Flow measurement of electrically conductive liquids, focusing on demanding applications with the measurement of aggressive liquids and liquids containing very abrasive parts (sand, gravel, ores, etc.) in pipes up to DN400 (16").

  • FLONET FR10xx

    Flow measurement of instantaneous flow rate of electrically conductive liquids in pipes from DN6 up to DN1200 (1/4" to 48") in water systems. Uses HART or Foundation FieldBus communication.

  • FLONET FF50xx

    Flow measurement of conductive liquids in pipes from DN10 up to DN100 (1/2" to 4") mainly in food industry. It uses the RS485/MODBUS RTU communication line.

Displayed 7 items