INFICON Explorer Portable Gas Chromatograph - Manual (Page 297)

Explorer Operator Manual
295
Creating a Custom Method
Generally, you will not need to run all 40 compounds in the Assay 1 library, you
will only be interested in a few compounds specific to your application. You can use
the information provided in this document to select your compounds and then the
chromatography for your compounds.
There are two ways of creating a custom method. You can modify the library of an
existing method or you can optimize the chromatography of an existing method, by
changing the method parameters.
General Information
Modifying the library of an existing method is a matter of adding or deleting a
compound, performing a calibration and storing the compounds in a custom
application file.
Changing the method parameters enables you to create a customized method
optimized for your application. However, you must first perform a few analyses to
determine the new method’s analysis and backflush times.
NOTE: Do not inject heavy compounds onto Column C. They may be retained for extended
periods of time, and may contaminate your column.
1. Set the Column A backflush time to 1500 seconds, and the analysis time to
3200 seconds, then analyze your target compounds on Column A.
Column A is the precolumn for all other columns, so the retention times of the
target compounds on Column A are used to determine the backflush timing for
all columns.
2. The backflush time for a run on Column B or C is the retention time, from
Column A, of the last peak you wish to analyze plus 0 to 50 seconds.
The backflush time for Column A is equal to the retention time of the last peak
of interest plus 50 to 200 seconds, typically.