Barber Colman SPDT Pneumatic Electric Relay (2 PSI Dif.)

The 2364-211 and 2342-220 Pneumatic Electric Relays are used in control systems requiring conversion of gradual air pressure changes to positive electrical switching actions. Typical applications are starting/stopping unit ventilators, fan coil motors, unit heaters, and air handling unit fans. These relays incorporate a nonmetallic diaphragm that is displaced by air pressure changes. The diaphragm in turn operates a single heave-duty SPDT switch in the 2364-211 and a DPDT switch in the 2364-220.