46
5 Maintenance
5.2.3
Preparation
Carrying out an adjustment always takes some time. Leave your-
self plenty of time to prepare the necessary steps of the procedure.
Have all necessary tools available. Let the device run for several
minutes to ensure that the temperature is correct, for example.
5.2.4
Performing the adjustment
The zero point and sensitivity are adjusted following the same
procedure for all gas concentrations (see Section 5.2.4.1 on
page 46 / Section 5.2.4.2 on page 47
).
You can find detailed information on adjustment (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.
5.2.4.1 Adjusting the zero point
The zero point is adjusted following the same procedure for all
gas concentrations.
1. Make sure that only fresh air is being drawn in.
2. Open the
settings
(see
).
3. Select
Adjustment
from the menu.
4. Select the desired adjustment (e.g.
H2 PPM adjustment
).
5. Wait at least 1 minute. The displayed reading must be stable.
6. Select
Zero point
from the menu (select and confirm with
OK
).
This adjusts the zero point. The reading shows zero (0.0 %
vol. or 0.0 ppm).
