INFICON Explorer Portable Gas Chromatograph - Manual (Page 79)

Using Explorer
6. Press BKFLSH and enter the backflush time.
In TVOC operation the backflush time is only used for syringe injections.
Backflushing and can reduce peak tailing due to the injection port.
Backflushing of the injection port begins at the backflush time.
The sample will clear the column in approximately 30 seconds, The exact time
will depend on the pressure and resulting column flow rate. You must then
backflush the column to ensure any sample residue is removed from the
chromatographic system. Set the back flush time to equal the retention time of
the unretained sample.
7. Press Enter Menu to confirm the entry.
8. Press ANLZ and enter the analysis time.
An analysis time of 60 seconds can be used for most applications. If you are
using syringe injection, set the analysis time so that it includes the sample
transit time (retention time) and the backflush time. If the sample clears the
column in 30 seconds, then the backflush time has also been set to 30 seconds
and the resulting analysis time will be 60 seconds (30+30).
9. Press Enter Menu to confirm the entry.
10. Press Exit and then PRESS and enter a pressure setting.
Set the pressure to the same value used in your GC method to reduce the time
between runs.
If necessary you can operate the TVOC at 14 psi. This will increase sensitivity
and reduce the TVOC analysis time allowing faster TVOC cycling. If the
TVOC and GC methods contain different pressure settings,
Explorer must
stabilize for 20-30 minutes between runs. You may lose any time gained by
increasing the TVOC pressure.
11. Press Enter Menu to confirm the entry.
12. Press Exit then press SENSE and enter the desired detector sensitivity.
13. Press Enter Menu to confirm the entry and then press Exit.
NOTE: The column temperature will be set by the GC method for last active column.
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