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The response factor calculation, using the external standard, is:
ARF
n
=
Area
n
Cal
n
or
HRF
n
=
Ht
n
Cal
n
where
ARF
n
area response factor for component “n” in area per mole percent
Area
n
area associated with component “n” in calibration gas
Cal
n
amount of component “n” in mole percent in calibration gas
Ht
n
peak height associated with component “n” mole percent in calibration gas
HRF
n
peak height response factor for component “n”
Calculated response factors are stored by the controller assembly for use in the
concentration calculations, and are printed out in the configuration and calibration
reports.
Average response factor is calculated as follows:
RFAV G
n
=
∑
i=1
k
RF
i
k
where
RFAVG
n
area or height average response factor for component “n”
RF
i
area or height average response factor for component “n” from the calibration run
k number of calibration runs used to calculate the response factors
The percent deviation of new RF averages from old RF average is calculated in the following
manner:
deviation =
RF
new
− RF
old
RF
old
× 100
where the absolute value of percent deviation has been previously entered by the
operator.
1.6.2 Concentration calculation - mole percentage (without
normalization)
Once response factors have been determined by the controller assembly or entered by the
operator, component concentrations are determined for each analysis by using the
following equations:
Introduction
1
Introduction
11