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5 Maintenance
5.2.4
Preparation
An adjustment always requires time. Leave yourself plenty of time
to prepare the necessary steps of the procedure.
●
Have all necessary tools available.
●
Let the device run for several minutes to guarantee that the
temperature is correct, for example.
5.2.5
Performing the adjustment
The zero point and sensitivity are adjusted following the same
procedure for all gases. The adjustment of
oxygen
is an
excep-
tion
. It is therefore described separately.
You can find detailed information on the adjustment
of various gases (for example, test gas concentration,
installation date of the sensor, date of last adjustment)
under
Information
.
The symbol appears after the corresponding
Adjust-
ment…
menu item has been selected.
5.2.5.1 Adjusting the zero point
For all gases except oxygen O
2
, the zero point is adjusted follow-
ing the same procedure.
Note:
When adjusting the zero point of carbon dioxide CO
2
, a carbon
dioxide filter
must
be used.
This applies to both the zero point adjustment for
Adjustment
CO2
in the menu and
Adjustment gas mixture warning
.
1. Make sure that only fresh air is being drawn in.
2. Open
Settings
.
3. Select
Adjustment
from the menu.
4. Select the desired adjustment (e.g.
Adjustment CH4
,
Adjust-
ment gas mixture warning
).
5. Wait at least 1 minute. The displayed reading must be stable.
