INFICON Explorer Portable Gas Chromatograph - Manual (Page 163)

Explorer Operator Manual
161
If your chromatographic settings have not changed from the original assay, but
library compounds are not correctly identified or not identified at all, they may have
drifted out of the peak recognition window. You can update library information
based on a recent chromatogram that has been run using the original assay. See
Compound Library on page
109. Changes made to the current library are not made
to the reference library.
Column Selection
Each assay contains three columns. Each column has a library of compounds and
their associated chromatographic information. Refer to the assay notes to determine
which is the best column on which to run your compounds. If the compounds of
interest must be run on two columns, you must perform two runs to complete an
analysis and two runs to calibrate the instrument. See Column/Detector Selection
on page
105.
An ECD is available for Explorer that is configured for Assay 1. You must have the
ECD installed to access the ECD options. In the Instrument tab, select the PID, the
ECD or both.
You can set the PID to high sensitivity for low concentrations, or for compounds
that do not respond well to a PID. Select low sensitivity for high concentrations.
The PID sensitivity is equivalent to the detector gain. See Detector State on page
174
for details or setting the PID sensitivity. Refer to the assay notes for guidelines on
setting the gain.
To select the required column/detector combination:
1. Select the Assay tab.
2. Select the desired column/detector pair from the drop-down box.
The library for the selected column will be displayed in the library box.
Any changes you make to the method apply to the currently selected column only. If
you need to change the setting for another column, select the next column/detector
pair and make the necessary changes.