INFICON Explorer Portable Gas Chromatograph - Manual (Page 169)

Explorer Operator Manual
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3. Enter the desired Analysis Time and click OK to accept the change and close
the dialog box.
The change you have made applies to the currently selected column only. If
you need to change the setting for another column, select the next column and
change the analysis time.
4. Save the assay.
Backflush Time
The analysis time consists of the foreflush time and the backflush time. During
foreflush the sample is injected onto the column and is allowed to clear the
precolumn. When the compounds of interest have cleared the precolumn, backflush
begins. Set the backflush time so that all your compounds of interest clear the
precolumn. Perform a few runs to ensure that compounds of interest enter the
analytical column, but contaminant compounds are backflushed.
You can enter the backflush time as a function of the other method parameters. By
entering as a function, the backflush time will be updated accordingly when any of
the function parameters are changed. Enter the backflush time as a function of
analysis time (A), pump time (P), injection time (I) . For example backflush time =
(A+P)/3. If the analysis time or pump time are modified the backflush time is also
updated.
To set the backflush time:
1. Select the Assay tab.
2. In the Method box, click Config .
3. Click Inject .
The Injection dialog is displayed.