3 Operation
│
11
3.2.2
Zero point
The zero point only has to be set manually if the displayed fresh
air measurement is not zero after the end of the warm-up period.
Gas Content in fresh air Correct zero point on device
O
2
20.9 % vol.
20.9 % vol.
CO
2
0.04 % vol.
0 % vol.
CH
4
0 % vol.
0 ppm or 0.0 % vol.
H
2
S
0 ppm
0 ppm
CO
0 ppm
0 ppm
The manual zero point setting is not saved. The zero point can
be corrected by adjustment as often as zero point deviations oc-
cur (section 5.2
).
Requirements for correct setting of the zero point
●
Device has been 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 automati-
cally adjusted. The device returns again to measuring mode.
In the
Interspace
application, you can also access the
Set zero
point
function using the corresponding symbol.
