42/24-10 EN Rev. 9 Chapter 8: Gas Analyzer Calibration 8-C-15
Oxygen Sensor: Notes for Calibrating
Test Gases The oxygen sensor zero is not calibrated since it is fundamentally stable.
Ambient (non-process) air with a constant oxygen content (e.g. 20.96 Vol.-%) is
required for span calibration. Synthetic air can also be used.
Test Gases for
Simultaneous
Calibration of the
Oxygen Sensor and
Analyzer Module
The oxygen sensor and associated analyzer module are calibrated simultaneously
during automatic and externally controlled calibration.
Therefore when the oxygen sensor is to be calibrated with the following analyzer
modules
• Magnos206 with single-point calibration
• Limas11 with calibration unit
• Uras26 with calibration units
the zero gas should contain the required concentration of oxygen.
In all other cases the span gas should contain the required concentration of
oxygen.
External Control
Arrangement
The design of the external control of calibration should take into consideration
that the oxygen sensor’s span value is stable only after a waiting period of
≥ 40 seconds.
Wait Until End of
Warm-Up Phase
The oxygen sensor is always calibrated at the same time as the associated
analyzer module. Therefore, calibration should begin only after this module’s warm-
up phase.
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