38
│ 5 Maintenance
5.2.3
Special features of adjustment with gas mixture
If you are using a SEWERIN gas mixture as the test gas, the fol-
lowing gases can be adjusted in a single step via
Adjustment
gas mixture measuring
:
●
Methane CH
4
●
Carbon dioxide CO
2
●
Oxygen O
2
●
Hydrogen sulphide H
2
S
SEWERIN recommends the test gas
Bio IR
as the gas mixture.
It contains 60 % vol. CH
4
, 40 % vol. CO
2
and 180 ppm H
2
S.
Note:
Use of test gases not provided by SEWERIN can cause interfer-
ence.
The concentration of the test gas used must match the specified
test gas concentration.
Zero point
For a gas mixture, the zero point is adjusted under
Fresh air
in
the menu. The following parameters are adjusted in a single step:
●
Zero points of CH
4
, CO
2
and H
2
S
●
Sensitivity of O
2
(20.9 % vol.)
Sensitivity
The sensitivity
is adjusted under
Gas mixture
in the menu. The
following parameters are adjusted in a single step:
●
Sensitivities of CH
4
, CO
2
and H
2
S
●
Zero point of O
2
