19 years ago
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.