German-based Kobold Instrumentation manufactures a polysulfone paddle to monitor flow for nominal pipe sizes greater than NW 32. Applications include the monitoring of cooling circuits, dry running protection for pumps, prevention of low water levels, monitoring pipe fractures and the monitoring of lubricant circuits.
Fluid flow, regardless of direction, deflects the paddle and via an eccentric moves a magnet holder fitted to a permanent magnet. The magnet actuates a reed switch embedded in the switching tube.
The paddle switch is available with N/O contact or N/C contact. The inlet and outlet pipe section should be approximately three times the nominal size of the piping. The flow monitor can be fitted in a standard T piece or reducing pipe. Ideally the flow monitor should be fitted in horizontal piping. The Kobold PPS features:
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