Maintaining the PCM 14
Maintaining Your GC 269
Calibrating the PCM Interface
The interface's flow module contains a pressure sensor that
must be zeroed after it is installed on the GC. Calibration
ensures an accurate interface pressure display.
Do not connect the carrier gas to the flow module until you have
zeroed the interface's pressure sensor. For more information on
zeroing the pressure sensor, refer to the Advanced User Guide.
Use the Software Keyboard to complete the following steps.
1 If the gas supply is connected to the GC, turn off the supply
at the source, then disconnect the supply line from the PCM
inlet fitting.
2 Turn on the GC and wait 15 minutes to allow it to reach
thermal equilibrium.
3 When the GC has reached thermal equilibrium, press
[Options], scroll to Calibration and press [Enter].
4 Scroll to the module to be zeroed and press [Enter].
5 Scroll to a zero line and press [Info]. The GC will remind you
of the conditions necessary for zeroing that specific sensor.
Flow sensors. Verify that the gas is connected and flowing
(turned on).
6 Press [On/Yes] to zero or [Clear] to cancel.
7 Turn off the GC.
8 Plumb the carrier gas to the flow module.
9 Turn on the GC.
If you were calibrating the flow sensor after replacing the PCM,
check for leaks.
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