Siemens ULTRAMAT 23 Product Information page 19

Proceed as follows to remove the old sensor:
1. Flush the gas path for about 10 minutes with zero gas (AUTOCAL)
2. When sample gas is no longer present in the gas path, disconnect the analyzer from the power supply.
3. Open the unit by removing the four bolts on the cover.
4. Remove the connector from the H S sensor (arrow).
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5. Unscrew the H S sensor out of the holder.
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Figure 6 Position of the H S sensor in the analyzer (arrow)
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Supplement 1 for Operating Instructions C79000-G52xx-C216-03
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A5E02769382-03, 03/2012