Automatic Pressure Balance
A pressure transmitter detects the pressure differential between the inlet chamber and the room;
a second pressure transmitter detects the pressure differential between the cooling chamber and
the room. The PLC, by operating on the exhaust fan, controls the pressure differential between
the inlet chamber and the room; by operating on the cooling chamber exhaust fan, controls the
pressure differential between the cooling chamber and the room. The differential pressure
between the cooling chamber and the inlet chamber is maintained within 2 Pa.