40
6 Commissioning
6.4.2 Calibrating the O
2
Electrode
• Activate Maintenance mode.
NOTICE
Access level 1 or 2 required!
NOTICE
When calibrating the O
2
electrode in CO containing flue gas the O2 sensors’ Kelvin value
moves outside the permissible range (< 800 ... >1200 K). The warning WH004 or WH104 is
indicated CO temperature is too high/too low.
The calibration have to be repeated on another point of O
2
without CO in the flue gas.
The calibration can be performed by reference measurement using an external measuring de-
vice or by using test gas at a known O
2
concentration. For KS1D type 656R2000 a special test
gas adapter is required.
For the KS1D-HT (Type 656R2015), a hose connection for calibration gas through which the
test gas (40 ... 60 l/h) can be input is available.
A special test gas adapter is not required for this type.
Recommended test gas: 3 vol.% O
2
in N
2
.
NOTICE
When performing a reference measurement using an external measuring device, check if the
measuring device is measuring wet or dry. In the case of devices with an upstream measuring
gas cooler, it always concerns a dry measurement. This also applies to devices which remove
the moisture by means of a chemical substance. The KS1D probe measures wet. The differ-
ence between a wet to dry measurement is evident from the graphic in the appendix under
13.5 Wet/Dry Measurement Deviations, Conversion Table.
NOTICE
Calibration / checking with a reference measurement functions only
with O
2
values < 15 vol. % and > 1 vol. %.
In the Main Menu, select for probe cali-
bration.
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