Model FWS

Flow monitor

For monitoring the flow of liquid and gaseous media

Selected documents
Sales contact

WIKA Merna Tehnika d.o.o.

+381 11 2763 722


  • Continuous flow indication without power supply
  • Thirteen different versions and corrosion resistant materials make the products suitable for a broad range of applications
  • Machine building, chemical industry, pharmaceutical industry, medical engineering
  • Cooling systems and cooling circuits, transformers, central lubrication systems and recirculating oil lubrication systems
  • Research and development

Special features 

  • High switching accuracy and functional safety
  • Large switching range, low switch hysteresis
  • Continuous switch point setting by the operator
  • Viscosity compensated models available
  • Explosion-protected versions


The model FWS flow monitors are used for the display and monitoring of the flow of liquid and gaseous media, e.g. in cooling systems and cooling circuits of welding machinery, laser and piping systems, dosing systems, pumps, compressors, hydraulic systems, high-pressure plants and many more.

The flow monitors operate in accordance with the float-body measuring principle. A float body is guided within a cylindrical slotted nozzle or in a cylindrical measuring tube. A reed contact is mounted outside of the flow circuit.

The reed contact is cast into a continuously adjustable case (switch case) and thus is protected from external influences.

The flowing medium moves the float body in the direction of the flow. When the float body, with its integrated magnet, reaches the position of the reed switch, this closes. When the flow rate rises, the float body moves further in the direction of the flow, maximally until it reaches a stop. This stop prevents the float body from being driven beyond the switching range of the reed switch (bistable characteristic).

Flow monitor
  • Flow monitor
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