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HFS 2500 for Water / Water-based Media


The HYDAC Flow Switch in the series HFS 2500 is based on the variable area float principle. Indeed, 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. So, when the magnet inside the float reaches the pre-set position, the reed contacts will switch.

What’s more, to protect it from external influences, a casing, designed to allow steplessly variable adjustments, encapsulates the switch.

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

In addition, the 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
  • Also research & development


  • Water / water-based media


  • An accuracy ≤ ± 5 % or ≤ ± 10 % FS
  • Any mounting position
  • A high level of function reliability
  • A high level of switching accuracy
  • Stepless switch point set by the user
  • A high-pressure resistance
  • Also, threaded connection
  • ATEX version also available for potentially explosive atmospheres


921777HFS 2535-1W-01,0-0014-6-B-1-000
921775HFS 2531-1S-00,2-04,0-6-B-0-A00
921781HFS 2536-1S-04,0-0020-7-B-0-000
921743HFS 2536-1S-08,0-0030-7-B-0-000
921836HFS 2536-1W-04,0-0020-7-B-0-000
921837HFS 2556-1W-015-0045-7-B-0-000
921838HFS 2556-1W-0030-0090-7-B-0-000
921719HFS 2556-1W-0010-0030-7-B-0-000
921675HFS 2535-1S-01,0-0014-6-B-1-000
Contact us for more information on this product

HYDAC Australia

HYDAC New Zealand

AUSTRALIA 1300 449 322

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