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MON20/20 Software for Gas Chromatographs User Manual
OCTOBER 2010 3-9000-745
B-3
The zero reference line will, in general, be non-horizontal, and thus
compensates for any linear drift in the system from the time the peak
sequence starts until it ends.
In a single peak situation, peak area is the area of the component peak
between the curve and the zero reference line. The peak height is the
distance from the zero reference line to the maximum point on the
component curve. The value and location of the maximum point is
determined from quadratic interpolation through the three highest points
at the peak of the discrete valued curve stored in the controller assembly.
For fused peak sequences, this interpolation technique is used both for
peaks, as well as, valleys (minimum points). In the latter case, lines are
dropped from the interpolated valley points to the zero reference line to
partition the fused peak areas into individual peaks.
The use of quadratic interpolation improves both area and height
calculation accuracy and eliminates the effects of variations in the
integration factor on these calculations.
For calibration, the controller assembly may average several analyses of
the calibration stream.
B.3 Analysis computations
There are two basic analysis algorithms included in the GC:
• Area Analysis – calculates area under component peak
• Peak Height Analysis – measures height of component peak