Service and maintenance
10.2 Maintenance work
ULTRAMAT 23
Manual, 3/2016, A5E37100388-003
171
Replacing the electrochemical oxygen sensor
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 affected 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. Unscrew the two screws of the front cover and remove the cover.
2. Unlock the plug of the sensor connection, and remove.
3. Unscrew the O
2
sensor out of its holder.
4. Remove the gasket of the O
2
sensor.
The exhausted O
2
sensor must be disposed of as electronic waste with the code number
160215 "Dangerous component removed from used equipment". It must therefore be
disposed of correctly and in an environmentally-friendly manner by a local waste disposal
company.
5. Insert the new gasket.
6. Screw in the new O
2
sensor and tighten hand-tight.
7. Reconnect the plug.
8. Enter the date of installation of the new sensor in the menu item "O
2
cal. after install" as
described in section Calibration: O2 measuring range: Sensor inst. date (Page 114).
9. Calibrate the zero point of the new sensor as described in section Calibration: O2
measuring range: Calibrating the O2 zero point (Page 115).
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