14
3 Operation
3.2.2
Zero point
The zero point can be set manually under
Zero point
in the menu.
This is only necessary if the measurements displayed are different
to the values for fresh air after the end of the warm-up period.
Gas
Content in fresh air Correct zero point on device
CH
4
0 % vol.
0.0 % vol.
CO
0 ppm
0 ppm
CO
2
0.04 % vol.
0.04 % vol.
H
2
S
0 ppm
0 ppm
NH
3
0 ppm
0 ppm
O
2
20.9 % vol.
20.9 % vol.
The manual zero point setting is not saved. The zero point can be
corrected by adjustment as often as zero point deviations occur.
Requirements for correct setting of the zero point
●
Device was switched on with fresh air.
●
Device continues to draw in fresh air.
Setting zero point (manual zero point setting)
1. Press
Menu
.
2. Select
Zero point
from the menu. The values are automatically
adjusted. The device returns to measuring mode.
3.2.3
Warning ExTox
You can access the overview of detectable gases and correspond-
ing alarm thresholds under
Warning ExTox
in the menu (Fig. 4
).
The device automatically returns to measuring mode (Fig. 5
).
3.2.4
Settings
You can change the device settings and access information
about the device under
Settings
in the menu (see
).
