HFS 2500 for Water / Water-based Media


The HYDAC Flow Switch in the series HFS 2500 is based on the variable area float principle. The test medium deflects a spring-loaded float in the direction of flow, depending on the flow rate. A reed contact is fitted to the outside of the instrument and is, therefore, separate from the flow circuit. When the magnet inside the float reaches the pre-set position, the reed contact will switch.

To protect it from external influences, the switch is encapsulated in a casing designed to allow steplessly variable adjustment.

The instruments in the HFS 2500 series are available in two versions, with 5% accuracy and with 10% accuracy.

Areas of application are to monitor flow rate in fluids (water / water-based) in the following areas, amongst others:

  • Cooling systems and circuits
  • Hydraulic systems
  • Pumps
  • Welding machines and laser systems
  • Medical technology
  • Pharmaceutical industry
  • Chemical industry
  • Research & development


  • Water / water-based media


  • Accuracy ≤ ± 5 % or ≤ ± 10 % FS
  • Any mounting position
  • High level of function reliability
  • High level of switching accuracy
  • Stepless switch point setting by user
  • High-pressure resistance
  • Threaded connection
  • ATEX version also available for potentially explosive atmospheres


Contact us for more information on this product

HYDAC Australia

HYDAC New Zealand

AUSTRALIA 1300 449 322

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