16 Maintaining EPC Modules
Calibrating the PCM Interface
Maintaining Your GC 261
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.
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).
Pressure sensors. Disconnect the gas supply line at the back of the GC. Turning it off is
not adequate; the valve may leak.
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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