6 Commissioning / Shutdown
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6.4.1 Offset calibration of both sensors on ambient air
The first commissioning / first calibration must be carried out in environment
temperatures of -20...+40°C with air (offset calibration).
If this should not be ensured in the inserted condition, the first caliration of the probe
must be carried out in developed condition and may be inserted thereafter.
A first calibration uring too high flue gas temperatures is leading to storing wrong
datas of the probe, which can be affected the accuracy and the durability of the probe.
Uring offset calibration in ambient air the
• O
2
sensor will be calibrated to 21%
• U-COe voltage will be calibrated to “0”
NOTE:
Offset calibration on ambient air only works with O2 values > 18%.
Menu function
When you press the [cal] menu key, “Start calibration” appears in the display. After
you have activated calibration select:
Offset calibration on ambient air
• Uring calibration LED 5 is flashing slowly
• Length of calibration time max. 5 minutes
Possible warning / faults
Offset voltage outside the limits
Probe voltage U-O
2
< -20mV
• Trigger of the warning:
- Probe voltage U-O
2
in ambient air is outside the range of -20…+20mV
• Resolution:
- Probe is not in ambient air
- Reverse polarity swap probe connection terminals 33-34
- Change the probe / sensor
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