Pressure Control Modules - Agilent Technologies 7890 Series Advanced Operation Manual

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Flow and Pressure Modules

Pressure Control Modules

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The PCM is a general purpose module with two independent
control channels, designated 1 and 2. The general name of a
PCM module is PCM #, where the # (actually, a letter)
identifies the PCM (there can be up to 3 installed).
The two channels are not identical. Channel 1 is a simple
forward- pressure regulated channel that maintains constant
flow through a fixed restrictor.
Channel 2 may be used either as a forward- pressure
regulator or as a back- pressure regulator, simply by
reversing the input and output connections. The back
Advanced Operation Manual