User guide

Configuration 2
Advanced User Guide 47
PCM A/PCM B/PCM C
See “Unconfigured:” on page 26 and “Ignore Ready =” on
page 25.
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 configure a PCM
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].
This completes configuration for Channel 1. The rest of the
entries refer to Channel 2.
3 Scroll to Aux gas type, press [Mode/Type], make a selection
and press [Enter].