Figure 10-1 UV module
10.2.8 Replacing the electrochemical oxygen sensor
WARNING
Danger of chemical burns
The O
2
S sensor contains acetic acid, which leads to burns on unprotected skin. When replacing
the sensor, its enclosure must not be damaged.
If contact with the acid occurs despite great care being taken, rinse the aected skin
immediately with plenty of water!
Also note that an exhausted or faulty O
2
sensor is hazardous waste and must be packed and
disposed of accordingly!
To replace the sensor, proceed as follows:
1. The U23 should be purged beforehand and the sample gas supply must then be turned o.
2. Unscrew the two screws of the front cover and remove the cover.
3. Unlock the plug of the sensor connection, and remove.
4. Unscrew the O
2
sensor out of its holder.
Service and maintenance
10.2 Maintenance work
ULTRAMAT 23
Equipment Manual, 04/2022, A5E37100388-012 173
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