68
5 Maintenance
8. Press
OK
to confirm. The device is adjusted. The reading
shows the specified value (for example, 2.20 % vol. CH
4
).
9. Let go of the release button on the test set.
5.2.6
Carrying out an oxygen adjustment
As oxygen is a component of fresh air, the procedure for adjusting
oxygen is different from the procedure for all other gases.
5.2.6.1 Adjusting the zero point for oxygen
The zero point for oxygen must be adjusted using a gas which
contains no oxygen and does not damage the sensor.
The following resources are needed for adjusting the zero point
of oxygen:
●
Test gas
Information on test gases for adjustment can be found in sec-
●
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.
4. Select
Adjustment O2
menu item.
5. Select
Zero point
menu item.
Do not confirm with OK yet
.
6. Press and hold the release button on the test set. The test gas
is added.
Do not let go of the release button
.
7. Wait at least 1 minute. The displayed reading must be stable.
8. Press
OK
to confirm. The device is adjusted. The reading
shows zero (0.0 % vol.).
9. Let go of the release button on the test set.
