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 CAPILLARY LENGTH FEET3 MAX OPERATING PRESSURE (PSI)250 psig (1723 kPa) MAXIMUM OVERPRESSURE PSIG (KPA)325 (2241) PSIG (KPA) RANGE20 in. HG Vacuum to 100 (-68 to 690) DIFFERENTIAL PSI (KPA)2.2 ±1.5 (15.2 ±10.3) SWITCH ACTIONSPST TIME DELAY60 sec. PRESSURE CONNECTOR1/4 in. Male Flare Fitting LIMITED WARRANTY YEARS1