246 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Response factors for additional sample components
If a measuring component is added with a response factor which was not
factory-set, we recommend determining this as follows:
factor Response
omponentC
ComponentPropane
PropaneComponent
ionconcentrat gas Testdisplay value Measured
ionconcentrat gas Testdisplay value Measured
×
×
=
The following information should therefore be noted in particular:
• The zero point should not differ essentially from the calibrated zero
point, in particular when measuring with small concentrations. Other-
wise the display must be offset against the deviation from the calibra-
tion of the zero point with the measured value display.
• The response factors of a gas in nitrogen and in synthetic air may differ
considerably from each other.
• The measurements should always be performed with a sample compo-
nent and a measuring range, e.g. TOC in ppm C1. When calculating the
test gas concentration, the number of C-atoms must be considered.
• Test gas cylinders with high accuracy should be (1 % and better) used.
Other relevant variables
The following variables must be stored in the software of the gas analyzer
for each measuring component: molar mass, number of C-atoms, response
factor and strip factor. These variables are stored for the standard sample
components; they must be entered when adding a user component.
Molar mass
M
C
= 12.011 g/mol
M
H
= 1.008 g/mol
Molar volumes
V
m
= 22.414 for 0 °C and 1013 hPa
V
m
= 24.05 for 20 °C and 1013 hPa
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