User Manual MON20/20 Software for Gas Chromatographs
3-9000-745 OCTOBER 2010
B-14
where
B.4.4 Indirect calibration
Component gases that are not found in the calibration gas, but may be
found in t he sample g as, can be as signed a re lative res ponse fact or that is
a fixed multiple of a reference component that is found in the calibration
gas.
The Relative Response Factors and Reference Component Values are
included in the Component Data Table. See Appendix A for more
information.
If the Reference Component is None, then normal (direct) calibration is
used.
If the Reference Component is defined, (e.g. Propane) then the mole%
value for the indirect component (e.g. neoC5), is calculated as:
where
PPeak size measured in sample gas.
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.
PPeak size
RRF Relative Response Factor
mole% (neoC5) = mole% (Propane)
PneoC5()
P Propane()
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RRFneoC5()