INFICON Explorer Portable Gas Chromatograph - Manual (Page 195)

Explorer Operator Manual
193
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 your compounds of interest are not
backflushed. Details of how to determine the backflush time are provided in the user
notes specific to your assay.
To change the backflush time:
1. Press Enter Menu, SETUP, CONFIG, COLUMN.
2. Select the column for which you want to alter the backflush time. Disable the
other columns.
3. Press Exit to close the box. Press Enter Menu to close the menu.
4. Press Enter Menu, SETUP, CONFIG, METHOD, TIMING, and BCKFLSH.
5. Use the arrow keys to enter the new backflush time. Press Enter Menu.
6. If you need to change the backflush time for the other two columns, repeat this
procedure for each column.
7. When you have changed the backflush time for each column, enable all the
columns required for your method.
Pump Time
The pump time is the duration the pump draws sample through the sample in port to
flush and fill the sample loop. You must increase the pump time if you are using a
long probe or an extended probe. Set the pump time to between 20 and 45 seconds.
The pump time for the probe is set automatically when you select the probe to be
used:
1. Press Enter Menu and then press SETUP, MODE, INJECT.