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

The SIKA flow switches are suitable for monitoring volumetric flows and are available in various nominal sizes and switching point ranges, depending on the requirements. Due to the "modular principle", the product variants and options can be individually combined for a wide range of applications. The wide temperature and pressure ranges as well as the choice of materials and the various connection options offer a high degree of flexibility. Therefore, SIKA flow switches are used in many areas, 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.