Options 11
Operation Manual 187
Pressure sensors
All EPC control modules use pressure sensors. They must be
zeroed individually. There is no automatic zero for pressure
sensors.
Auto flow zero
A useful calibration option is Auto flow zero. When it is On,
after the end of a run the GC shuts down the flow of gases
to an inlet, waits for the flow to drop to zero, measures and
stores the flow sensor output, and turns the gas back on.
This takes about two seconds. The zero offset is used to
correct future flow measurements.
To activate this, select Calibration on the Options menu, then
choose either Front inlet or Back inlet, press [Enter], and turn
Auto flow zero on.
Auto zero septum purge
This is similar to Auto flow zero, but is for the septum purge
flow.
Zero conditions
Flow sensors are zeroed with the carrier gas connected and
flowing.
Pressure sensors are zeroed with the supply gas line
disconnected from the gas control module.
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