The P32 Series Differential Pressure Switch is used to detect differential pressure or low positive gauge pressure by using only the high pressure connection and leaving the low pressure connector open. It can also detect vacuum by using only the low pressure connection and leaving the high pressure connector open to ambient pressure. The P32 Series is factory set at the bottom of its operating range with the diaphragm in a vertical plane. The setting will change if mounted in other positions. The P32AF has a close differential, and the P32AC has a standard differential. FEATURES Easy-to-read set point scale Versatile mounting options Durable construction Set point switching repeatability APPLICATIONS Air proving with electric duct heaters, humidifiers, etc. Maximum air flow controller for variable volume systems Reheat duct-powered systems Clogged filter detection Detection of icing of air conditioning coils and initiation of defrost cycle SPECIFICATIONS Ambient temp range -40F(-40C) min, 165F (75C) max Pressure connection High pressure: metal 1/8" FNPT inside x 1/2" NPSM outside. Low pressure: molded 1/8" FNPT Contacts SPDT Pressure range P32AC-1 0.15-12" W.C. (37.4-2990 Pa) P32AC-2, AF-1, AF-2 0.05-5" W.C. (37.4-2990 Pa) Max overpressure 1 psig (6.895 kPa) Mounting Direct or with mounting bracket supplied Shipping weight 1.0 lb (0.45kg) P32AF Electrical ratings 1/4 HP @120 VAC Full Load amp 5.8 Locked Rotor amp 34.8 Non-Inductive amp 10.0 @208 VAC Full Load amp 3.3 Locked Rotor amp 20.1 Non-Inductive amp 10.0 @240 VAC Full Load amp 2.9 Locked Rotor amp 17.4 Non-Inductive amp 10.0 @277 VAC Non-Inductive amp 10.0 Pilot Duty 125 VA at 24 VAC 360 VA at 120-277 VAC P32AC Electrical ratings 1/2 HP @120 VAC Full Load amp 9.8 Locked Rotor amp 58.8 Non-Inductive amp 10.0 @208 VAC Full Load amp 5.6 Locked Rotor amp 33.9 Non-Inductive amp 10.0 @240 VAC Full Load amp 4.9 Locked Rotor amp 29.4 Non-Inductive amp 10.0 @277 VAC Non-Inductive amp 10.0 Pilot Duty 125 VA at 24 VAC 360 VA at 120-277 VAC