WIKA Flowswitch

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Flowswitch - For wet sprinkler systems Model FSFD, with adjustable time delay


  • Adjustable time delay mechanism to avoid false alarms during water surges
  • Tamper-proof cover prevents unauthorised access to the switch point setting
  • IP56/NEMA 4 ingress protection enables the instrument to be used indoors and outdoors
  • Two sets of microswitches activate the control panel and the local audible warnings
  • Two cable duct openings enable easy connections to terminal blocks

The model FSFD was developed to detect the water flow in wet sprinkler systems once the sprinkler has been triggered. The flow switch is fitted with a pneumatic time delay mechanism that can be set from 0 ... 70 seconds via an adjustment dial to avoid false alarms during water surges.

The tamper-proof screws on the cover prevent unauthorised access to the switch point setting. The robust design, with IP56/NEMA4 ingress protection, is suitable for indoor and outdoor applications. For error-free installation, the direction of flow is indicated on the case and on the saddle.

The model FSFD has two cable duct openings for two sets of SPDT switches (form C) in a fused terminal block, which provides a direct electrical connection to control panels and local audible warnings.

Since the flow switch is designed for pipe sizes from 2 ... 8" in various pipe schedules, it provides a complete solution for construction projects. The model FSFD has been designed for improved sensitivity and repeatability of the switch point and has UL and FM certifications

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Detection of the flow in wet sprinkler systems once the sprinkler has been triggered


Flow switch - For industrial heat exchangers Model FSM-6100


  • Switch point repeatability of ±0.5 % for reliable switching
  • High-quality bellows and microswitch for a service life of > 500,000 cycles
  • Rigid paddles from stainless steel to withstand pressure surges and high medium temperatures
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The model FSM-6100 electromechanical flow switch is designed for the detection of interrupted flow (“no flow”) of water and other non-corrosive liquids in industrial coolers, heaters or other industrial pipelines.

The flow switch signal is used for operational controls that prevent system failure, e.g. due to ice formation in the absence of cooling water flow. The cost-effective flow switch is enclosed by a plastic case. The ingress protection of IP30 protects it from unwanted ingress of foreign bodies.

The model FSM-6100 is equipped with UL-listed microswitches and protective bellows to ensure high durability with continuous operation and a long service life. The range of flow ranges, with pipe sizes from 25 ... 150 mm [1 ... 6 in], enables use for flow measurement in a variety of applications with non-critical media.

  • Heating, cooling, air-conditioning and water treatment plants
  • Pumps and dosing systems
  • Operational controls to prevent system failures in the absence of supply of water or liquid