INFICON Explorer Portable Gas Chromatograph - Manual (Page 205)

Explorer Operator Manual
203
3. Press Exit to close the box. Press Enter Menu to close the menu.
4. Press Enter Menu, SETUP, CONFIG, METHOD, METH, and HEIGHT.
5. Use the arrow keys to enter the new value and press Enter Menu.
6. Press Enter Menu, DISPLAY, GC, GRAPH, REINT.
The signal will be re-integrated using the new integration settings.
7. Press DISPLAY, GC, PEAK to see if the unwanted peaks have been removed.
8. If you need to change the settings for the other two columns, repeat this
procedure for each column.
9. When you have changed the settings for each column, enable all the columns
required for your method.
Automatic Integration
The choice of initial up/down slope and filter can require some expertise.
Explorer automates this procedure as the up/down slope, Minimum height, and
Filter options are set automatically if automatic integration is enabled.
These parameters are calculated on the basis of signal noise sampling during the first
five seconds of an analysis. During the first five seconds of an analysis, the signal is
sampled by the integrator at a frequency of approximately 20 Hz. The integrator
uses linear regression to determine the best line through these sample points. The
sample scatter is then used to determine the minimum height. The slope of each
group of five sample points is then calculated. The scatter of the slopes is used to
determine the up and down slope sensitivities.
If you have made changes to the integration settings and cannot obtain the desired
integration, then try using the automatic integration features.
1. Press Enter Menu, SETUP, CONFIG, COLUMN.
2. Select the column for which you want to alter the integration settings. Disable
the other columns.