34
│ 3 Operation
In contrast to performing a zero point adjustment, the temporarily
set zero point is not saved.
Note:
If the zero point deviates repeatedly from the target values, ad-
just the device.
Fig. 25:
Set zero point
Target values for the zero point
Gas
Content in clean air
Target value on the device
CH
4
0 % LEL
0 % LEL
CO
2
0.04 % vol.
0.04 % vol.
O
2
20.9 % vol.
20.9 % vol.
CO
0 ppm
0 ppm
H
2
S
0.0 ppm
0.0 ppm
Requirements for setting the zero point
−
The device is switched on in clean air.
−
The device is drawing in clean air.
−
The sensors are warmed up.
The device is in measuring mode. The measurement values
deviate from the target values.
1. Press the Enter key.
2. Select
Set zero point
. A prompt will appear.
3.
Confirm the prompt. The zero point is set. The device returns
back to measuring mode. The measured values in clean air
correspond to the target values.
