Siemens ULTRAMAT 23, Manual, Page: 172 / 244

Service and maintenance
10.2 Maintenance work
ULTRAMAT 23
172
Manual, 3/2016, A5E37100388-003
10.2.8 Replacing the hydrogen sulfide sensor
DANGER
Danger of poisoning
The replacement of the sensor module represents interference in the gas path. The sample
gas circulating therein may contain toxic components that lead to death in certain
concentrations.
To ensure that the sample gas path is free of toxic material when replacing the sensor
module, the gas path must be flushed with ambient air or nitrogen for a period of about 10
minutes before performing the task.
WARNING
Danger of electric shock
The device will be open when the sensor is being replaced. This means present dangerous
contact voltage will be present, which can lead to electric shock.
For this reason, the sensor module may only be replaced when power is off.
WARNING
Danger of chemical burns
The H
2
S sensor contains sulfuric acid, which leads to burns on unprotected skin.
Therefore do not use any tools when replacing the sensor module which could damage the
sensor due to sharp edges or squeezing.
If contact with the acid occurs nevertheless, rinse the affected skin immediately with plenty
of water!
NOTICE
Improper disposal
The exhausted or faulty H
2
sensor is hazardous waste and must be packed and disposed
of accordingly!
The exhausted H
2
S sensor is electronic waste with the code number 160215, that is, a
"dangerous component removed from used devices". It must therefore be disposed of
correctly and in an environmentally-friendly manner by a local waste disposal company.
Environmental damage may occur if this stipulation is not followed. The polluter is also
threatened with criminal action!