AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B 255
Magnos28: Notes for calibrating
Sample components
The Magnos28 analyzer module has at least one sample component normally
with 4 measuring ranges.
Test gases
Zero calibration: Oxygen-free process gas or substitute gas
Span calibration: Process gas with a known oxygen concentration or sub-
stitute gas, e.g. dried air
Highly suppressed measuring ranges (≥95 to 100 vol.% of O
2
) should only be
calibrated with test gases with O
2
concentration in the selected measure-
ment range.
Test gas for corrected sample components
During calibration possible electronic cross-sensitivity and/or carrier gas
corrections by other measurement components are switched off. Therefore,
corrected measurement components should be calibrated only using a test
gas consisting of the measurement component and an inert gas like Nitro-
gen.
Calibration with substitute gas
If test gases are not available for calibration, the analyzer module can be
factory-set for calibration with a substitute gas (see also section "Calibra-
tion methods" (see page 223)). This setting is documented in the analyzer
data sheet.
Substitute gas calibration of the Magnos28 analyzer module is described
using the example of "Purity measurement of CO
2
" (see page 258).
Single-point calibration
Single-point calibration of the Magnos28 analyzer module is described in the
"Magnos28: Single-point calibration" section (see page 256).
Suppressed measuring ranges
If suppressed measurement ranges with a suppression ratio of ≥ 1:5 are set
in the Magnos28 analyzer module, the pressure sensor has been specially
adjusted at the factory. Therefore, only a common calibration should be
carried out (not a single or substitute gas calibration) in this case.
Sequence of calibration
Zero-point calibration must always precede end-point calibration.
Wait until the warm-up phase has ended
The analyzer module should only be calibrated after the warm-up phase (see
page 135).
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