INFICON Explorer Portable Gas Chromatograph - Manual (Page 165)

Explorer Operator Manual
163
9. Review the data in the library information box. Compounds present in the
calibration gas must be selected for calibration. Compounds not present in the
calibration gas must be removed.
NOTE: All compounds contained in the library must be contained in the calibration gas.
10. Ensure you have entered the correct calibration concentration.
This is the concentration of the compound in your calibration gas.
11. Select whether you want the concentration averaged over multiple calibration
runs.
See Calibration Averaging on page
114 for details.
12. Enter an Alarm level.
13. Enter the Window percent.
The Window Percent is the deviation in retention time for which Explorer will
compensate. For example, if the window is set at 5%, a compound with a
retention time of 100 seconds will still be identified if it elutes between 95 and
105 seconds.
14. Select how you want the peak identified: as the Largest peak in the window or
as the Closest retention time in the library.
If there are interference compounds, that appear at the same retention time, but
are not as responsive to the PID or are present in very low concentrations, then
select Largest peak in the window. If the interference compound is close in
detector response, but has a different retention time, then select closest
retention time.
15. Select the desired Curve Fit option.
See Calibration Curve on page 115 for details.
16. If possible run the compound at more than one concentration. Use Store to
store up to five concentration values for a compound. Best response results will
be obtained this way.
See Multiple Point Calibration Curve on page
165 for details.