Galvanic Applied Sciences AccuChrome MA2963, Operation Manual

Page: 75 / 145

Revision 4 62 12/15/2018
The following example shows how the system determines if a peak is a valid peak:
The peak for iso-Butane is expected at 70.405sec. ± 5.000 sec. as defined by the component
table.
The
Skimming Peak Start and Skimming Peak End
parameters are 69.2 seconds and 71.8
seconds. This means that the apex of the peak is expected to occur between these two
times.
The
Skimming Peak Leading Edge Start
and
Skimming Peak Leading Edge Stop
parameters
are 3.6 and 1.3 seconds. This means that the start of the peak integration will occur between
70.405 seconds minus 3.6 seconds (66.804) and 70.405 seconds minus 1.3 seconds
(69.105). The start of the peak is defined as the minimum value of the detector signal
between these two points. The Skimming Peak Leading Edge Start and Skimming Peak
Leading Edge Stop times are defined relative to the retention time so that the peak
integration start time will move with the peak if the retention time of the peak shifts .
The
Skimming Peak Trailing Edge Start
and
Skimming Peak Trailing Edge Stop
parameters
are 1.3 and 5.5 seconds. This means that the end of the peak integration will occur between
70.405 seconds plus 1.3 seconds (71.705) and 70.405 seconds plus 5.5 seconds (75.905).
The end of the peak is defined as the minimum value of the detector signal between these
two points. The
Skimming Peak Trailing Edge Start
and
Skimming Peak Trailing Edge Stop
times are defined relative to the retention time so that the peak integration end time will move
with the peak if the retention time of the peak shifts.
Figure 5-5: Definition of a Peak
Savitsky Golay Window – This is a smoothing factor for the chromatogram and should not be
altered.
The following columns are to the right of the parameters for the fitting
approach.