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5 Maintenance
4. Select the desired adjustment (e.g. Adjustment CH4, Adjust-
ment gas mixture).
5. Wait at least 1 minute. The displayed reading must be stable.
Note:
For Adjustment gas mixture, all values must be stable. The time
required for this can vary depending on the specic gas.
6. From the menu select the method you wish to use to adjust
the zero point.
− e.g. for Adjustment CH4: Zero point
− e.g. for Adjustment gas mixture: Fresh air
7. Press OK to conrm.
This adjusts the zero point. The reading shows zero (0.00 %
vol. / 0 ppm). (Except for Adjustment gas mixture menu item:
the value for oxygen O
2
is 20.9 % vol.)
5.2.5.2 Adjusting the sensitivity
For all gases except oxygen O
2
, the sensitivity is adjusted follow-
ing the same procedure.
The following resources are needed for adjusting the sensitivity:
● Test gas
Information on test gases for adjustment can be found in Sec-
tion 5.2.2.
● Test set for the supply of test gas (e.g. SPE VOL)
Note:
Details of how to use the test set can be found in the accompa-
nying operating instructions.
1. Connect the device to the test set.
2. Open Settings.
3. Select Adjustment menu item.
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