AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B 249
Limas11 IR, Limas21 UV, Limas21 HW: Notes for calibrating
Calibration
Calibration can be performed in range 1 and range 2 for each sample com-
ponent. It is always a common calibration and thus affects both measuring
ranges.
Calibration cells
The use of calibration cells allows the analyzer module to be calibrated
without using test gas containers.
A maximum of 5 calibration cells can be installed. Each calibration cell is
filled with a test gas matched to the sample components and measurement
ranges.
Test gases for zero calibration
A zero gas is required for zero calibration in any case.
In addition to nitrogen, ambient air can be used for zero calibration. If the
ambient air contains sample gas components, these must be removed with
a suitable absorber.
Test gases for end-point calibration without calibration cells
A test gas is required for each sample component for span calibration with-
out calibration cells. Observe the notes in the "Analyzer Data Sheet" when
preparing the test gas mixtures. The concentration of the span gas should
be 70 to 80 % of the end value of the measurement range.
Test gases for span calibration of suppressed ranges
For suppressed ranges, the span gas concentration must be within the sup-
pressed range. If possible it should be equal to the end value of the sup-
pressed measuring range (and thus the end value of the larger measurement
range).
Test gases for automatic calibration
In principle a test gas for each sample component is required for the inter-
nally or externally controlled automatic calibration.
A test gas mixture containing each sample component in the appropriate
concentration may be used only when all sample components have no mutu-
al cross-sensitivity and/or carrier gas influences.
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