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Flow Switch | Type VH3 by Ross Brown Sales

Supplier: Ross Brown Sales

The Type VH3 Flow Switch: available now from Ross Brown Sales, from their flow switch product line.

Price Guide: POA

Possible areas of application

Our SIKA flow switches are used for monitoring volume flows. Depending on requirements, these are available for various nominal widths and set-point ranges.

Our modular approach allows product designs and options to be matched to a wide variety of applications. The broad temperature and pressure ranges, choice of materials and connection options ensure a very high level of versatility, which is why SIKA flow switches are used in so many areas:

  • Heating
  • Industrial cooling circuits
  • Water treatment
  • Potable water applications


The flow switch comprises a paddle system to whose end a permanent magnet is attached. Above this magnet is a reed contact, located outside the flow of fluid. A second magnet creates the force necessary to reset the switch back to the no flow position.

When the flow being monitored pushes against the paddle system, the paddle swings away. This changes the position of the magnet in relation to the reed contact and thus activates the contact.

As soon as the flow is interrupted, the paddle moves back to its starting position, thus activating the reed contact once again. The force necessary to push the magnet back is provided by the two magnets repelling each other. Using magnetic force instead of the usual leaf spring means that the switch is considerably more stable in the long term and much less sensitive to pressure peaks.

Technical features

  • Switching function
    • Contact closes at increasing flow
    • Contact opens at decreasing flow
    • Reversing possible
  • Pressure rating: PN 25
  • Medium temperature: -25...110 °C
  • Ambient temperature: -25...80 °C
  • Electrical connection: 1.5 m PVC jacket cable
  • Switching current: Max. 1 A
  • Switching voltage: Max. 230 VAC, 48 VDC
  • Rating: Max. 26 VA, 20 W
  • Degree of protection: EN 60529 IP65


  • Version for use in potentially explosive atmospheres

Further details and accessories can be found in the datasheet.

View product data sheet