42/24-10 EN Rev. 9 Chapter 1: Preparing the Installation 1-5
Test Gases for Calibration
Analyzer Module Zero Calibration Span Calibration
Caldos25,
Caldos27
Test gas or sample-
component-free process gas
or substitute gas
Test gas or process gas having a known sample
gas concentration or substitute gas
Magnos206 Oxygen-free process gas or
substitute gas
Process gas with a known oxygen concentration
or a substitute gas
with suppressed
measurement range
Measurement ranges ≥95 to 100 Vol.-% O
2
:
Test gas with O
2
concentration in the selected
measurement range.
with single point
calibration
Test gas with any concentration of O
2
within one
of the measurement ranges or ambient air.
Same moisture content as in the process gas.
In order to avoid accumulations of explosive
gas mixtures, do not use air as a test gas for
single-point calibration when measuring
flammable gases!
Magnos27 Oxygen-free process gas or
substitute gas
Process gas with a known oxygen concentration
or a substitute gas
Uras26,
Li ma s11
Nitrogen or air
If the ambient air contains
sample gas components,
these must be removed with a
suitable absorber.
Calibration cells (optional)
Span calibration without calibration cells: Test gas
for each detector or measurement component.
Span gas concentration 70 to 80 % of the end
value of the largest measurement range.
For suppressed ranges: Span gas concentration
within the suppressed range, if possible equal to
the end value.
only for Uras26 Water vapor must be
absorbed using a cooler.
Automatic and externally controlled calibration:
Test gas mixture for all detectors since all are
calibrated simultaneously.
only for Limas11 Observe the notes in the “Analyzer Data Sheet”
when preparing the test gas mixtures.
All analyzer modules During calibration of a multi-component analyzer,
possible cross-sensitivity and/or carrier gas
corrections by internal or external 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 N
2
.
Oxygen Sensor Zero is not calibrated since it
is fundamentally stable.
Ambient (non-process) air with a constant oxygen
content (20.96 Vol.-%) or synthetic air.
For simultaneous calibration with analyzer
modules observe the notes on page 8-C-15.
Test Gas Dew Point The test gas dew point must be nearly identical to the sample gas dew point.
Generally observe the “Notes for Calibrating the Analyzer Modules” in Chapter 8,
Section C.
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