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MON20/20 Software for Gas Chromatographs User Manual
OCTOBER 2010 3-9000-745
B-13
where
B.4.3 Multi-level calibration
The properties of each gas component can be viewed using the
Component Data menu. Included with the component properties in the
Component Data Table are four coefficients labeled Multi-Level Calib 'a',
'b', 'c', and 'd', for each component. If these parameters are all set to zero,
then linear calibration is used. See Section B.3.1 for the Response Factor
calculations.
If any of these parameters have a value other than zero, then multi-level,
or polynomial calibration is used for that component.
The response factors are then calculated as:
where
The mole% value in the sample gas is then calculated as
GD
Gas Density in lb/1000 ft
3
.
RD Relative Density (relative to air).
76.4976
Density of air at 14.73 PSIA and 60 °F, in lb/1000 ft
3
.
P Peak size from average calibration runs.
Coefficients:
a,b,c, and d
Calculated offline and entered after multi-level calibration using several--
typically seven--calibration gases.
NOTE: If the coefficient values are correct, the response factor will be close
to 1.
ResponseFactor
aP
3
bP
2
cP d+++
CalibrationConcentration
----------------------------------------------------------------------
=
(mol %)
Mole % =
aP
3
bP
2
cP d+++
responsefactor
-----------------------------------------------