42/24-10 EN Rev. 9 Chapter 8: Gas Analyzer Calibration 8-C-11
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 measurements of
the O
2
in N
2
substitute gas component.
Associated Gas
Influence
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 substitute
gas, e.g. dried air
Test Gas for
Corrected Sample
Components
During calibration cross-sensitivity and/or carrier gas corrections by other meas-
urement components are switched off. Therefore, a corrected measurement com-
ponent should be calibrated only using a test gas consisting of the measurement
component and an inert gas like N
2
.
Calibration with
Substitute Gases
If test gases are not available for calibration, the Magnos27 analyzer module can
be factory-set for calibration with substitute gases (see the “Calibration Methods”
section, page 8-A-10).
Substitute gas calibration of the Magnos27 analyzer module is described using
the example of “Oxygen Measurement in Flue Gas”, on page 8-C-12.
Sequence of
Calibration
Zero point calibration must always precede end point calibration.
Wait Until End of
Warm-Up Phase
The Magnos27 analyzer module should only be calibrated after the warm-up
phase, i.e. approx. 2-4 hours after connecting the power supply.
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