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CONC
n
=
Area
n
ARF
n
or
CONC
n
=
Ht
n
HRF
n
where
ARF
n
Area response factor for component “n” in area per mole percent.
Area
n
Area associated with component “n” in unknown sample.
CONC
n
Concentration of component “n” in mole percent.
Ht
n
Peak height associated with component “n” mole percent in unknown sample.
HRF
n
Peak height response factor for component “n”.
Component concentrations may be input through analog inputs 1 to 4 or may be fixed. If a
fixed value is used, the calibration for that component is the mole percent that will be used
for all analyses.
1.6.3 Concentration calculation in mole percentage (with
normalization)
The normalized concentration calculation is:
CONCN
n
=
CONC
n
∑
i=1
k
CONC
i
× 100
where
CONCN
n
Normalized concentration of component “n” in percent of total gas concentration.
CONC
i
Non-normalized concentration of component “n” in mole percent for each “k”
component.
CONC
n
Non-normalized concentration of component “n” in mole percent.
k Number of components to be included in the normalization.
Note
The average concentration of each component will also be calculated when data averaging is
requested.
1.7 Glossary
Auto Zero Automatic zeroing of the TCD preamplifier can be configured to take
place at any time during the analysis if the component is not eluting or
the baseline is steady.The FID will auto zero at each new analysis run
Introduction
12