AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B 259
Magnos27: Notes for calibrating
Sample components
The Magnos27 analyzer module has at least one sample component with
one measurement range and one measurement range for flue gas meas-
urements of O
2
in N
2
substitute gas component with 1 range.
Associated gas effect
Because of the thermomagnetic measurement technique employed by the
Magnos27 analyzer module, associated gases have an effect on results.
For this reason the sample gas composition must be considered during
initial calibration at the factory.
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
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 Magnos27 analyzer module is described
using the example of "Oxygen measurement in flue gas" (see page 260).
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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