Is anyone aware of any low cost flow switch for potable water service that could be used to trip a low power (nominal 12VDC at < 0.5 amp) relay at about 5-10% of typical max residential flow rate (ie about 0.5 litres per minute or 0.1 usgpm) but not unduly restrict max flow. Purpose is to trip an alarm or shutdown in the event of lost water flow on small lab condenser when water pressure and flowrate fluctuates all over the place (20 to 60 psig). non hazardous location, could be plastic.
- posted
20 years ago