Type VH305 Flow switch for direct installation Metal version with PVC sheathed cable DN 50...150 Switching range ON 1.9...25.0 m3/h Switching range OFF 1.8...24.9 m3/h

SIKA flow switches are suitable for monitoring volumetric flow rates and are available in various nominal diameters and switching point ranges, depending on requirements. Thanks to the “modular design,” product variants and options can be individually configured for a wide variety of applications. The wide temperature and pressure ranges, along with the selection of materials and various connection options, offer a high degree of flexibility. As a result, SIKA flow switches are used in many fields, including heating technology, industrial cooling circuits, water treatment, and drinking water applications.

The flow switch consists of a paddle system with a permanent magnet at the upper end. A reed contact is mounted above this magnet outside the flow. A second magnet generates a restoring force for the paddle. When the flow to be monitored hits the paddle system, it is deflected and changes the position of the magnet to the reed contact, actuating it. As soon as the flow is interrupted, the paddle moves back to its initial position and actuates the reed contact again. The restoring force required for this is generated by the two repulsing magnets. Utilizing the magnetic force instead of a conventional leaf spring results in significantly better long-term stability and greater insensitivity to pressure peaks.