The P28 series provides dependable lube oil protection on pressure of lubricated refrigeration compressors by sensing low lube oil pressure. A built-in time delay switch, accurately compensated for ambient temperature, allows for pressure pick up on start and avoids nuisance shutdowns on pressure drops of short duration during the running cycle.Features: direct-reading scale indicationadjustable set pointtrip-free manual resetreplacement timing relays availabledust-protected switch Product Specifications BRANDJohnson Controls PSIG (KPA) RANGE8 to 70 (55 to 483) HEATER CIRCUIT VAC120/240 TIME DELAY90 sec. PRESSURE CONNECTOR1/4 in. Female NPT TYPEManual Reset LIMITED WARRANTY YEARS1