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.
Two SPDT switches which switch simultaneously.