Alicat P Series Pressure Gauge - Manual (Page 30)

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PC3 AND PCR3 SERIES PRESSURE CONTROLLERS:
The PC3 and PCR3 Series pressure controller is designed to change the
flow to allow the control of pressure at some point away from the body of
the controller.
This is most helpful when it is necessary to mount pneumatic components
such as valves, fittings or flow meters that introduce significant pressure
drop between pressure controller body and the point where pressure
control is necessary.
To accomplish this, the PC3 has an external sensing port to which the pressure
at the location where pressure is to be controlled is piped back to the pressure
sensor in the controller.
P1
P3
P3 P3 P3
P3
P3 P2
Nozzle Under Test
Flow Meter (Pressure Drop) PC3 Series Pressure Controller PC3-Series Pressure Controller Flow Meter (Pressure Drop)
Nozzle Under Test
P1 P2
P3 P3
P3
Typical PC3 Application