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Maintenance
Sensors
(cont.)
Check sensors
Flue gas temperature sensor
1.75
1.25
0.75
A
50
0
Temperature in °C
Fig. 70
Data point shown: Resistance of 1.1 k
A
perature of 25 °C
Further sensors
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
-30
-20
-10
Temperature in °C
Fig. 71
1. Pull out corresponding plug.
2. Check the sensor resistance at the plug.
Lambda probe
For measuring the residual oxygen content in the flue
gas.
Check Lambda probe
1. Check the Lambda probe for dirt and damage. See
page 77.
2. Check the connecting cable for damage.
128
150
100
at a tem-
Ω
0
10
20
30
40
200
250
50
3. Compare the result with the actual temperature (for
scanning, see chapter "Diagnosis").
In the case of severe deviation, check sensor
installation and replace the sensor if necessary.
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