172 Operation Manual
10 Configuration
PCM A/PCM B/PCM C
See “Unconfigured:” on page 143 and “Ignore Ready =” on
page 142.
A pressure control module (PCM) provides two channels of
gas control.
Channel 1 is a simple forward- pressure regulator that
maintains a constant pressure at its output. With a fixed
downstream restrictor, it provides constant flow.
Channel 2 is more versatile. With the normal flow direction
(in at the threaded connector, out via the coiled tubing), it is
similar to channel 1. However with the flow direction
reversed (some extra fittings will be needed), it becomes a
back- pressure regulator that maintains a constant pressure
at its inlet.
Thus channel 2 (reversed) behaves as a controlled leak. If
the inlet pressure drops below setpoint, the regulator closes
down. If inlet pressure rises above setpoint, the regulator
bleeds off gas until the pressure returns to setpoint.
To assign a GC communication source to a PCM
1 Unlock the GC configuration, press [Options], select
Keyboard & Display and press [Enter]. Scroll down to Hard
Configuration Lock and press [Off/No].
2 Press [Config][Aux EPC #], scroll to a PCMx and press
[Enter].
3 With Unconfigured selected, press [Mode/Type], select Install
EPCx and press [Enter].
4 When prompted by the GC, turn the power off then on
again.
To configure the other parameters on this PCM, see To
configure a PCM.
To con fi gu re a P CM
1 Press [Config][Aux EPC #], scroll to the PCMx and press
[Enter].
2 Scroll to Gas type, press [Mode/Type], make a selection and
press [Enter].
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