64
5 Maintenance
Note:
Use of test gases not provided by SEWERIN can cause inter-
ference.
The concentration of the test gas used must match the specified
test gas concentration.
5.2.3
Special features of adjustment with gas mixture
If a SEWERIN gas mixture is used as a test gas, several gases
can be adjusted
in a single step
.
SEWERIN recommends a gas mixture comprising the test gas
ExTox IR
(2.2 % vol. CH
4
, 2.0 % vol. CO
2
, 40 ppm CO and 40 ppm
H
2
S in N
2
).
Gases which can be adjusted simultaneously with a
SEWERIN gas mixture
Test gas:
ExTox IR
Menu item:
Adjustment
gas mixture warning
Test gas: 60 % vol. CH
4
, 20 %
vol. CO
2
in N
2
Menu item:
Adjustment
gas mixture gas measuring
●
Methane CH
4
●
Carbon dioxide CO
2
●
Oxygen O
2
●
Hydrogen sulphide H
2
S
●
Carbon monoxide CO
●
Methane CH
4
●
Carbon dioxide CO
2
●
Oxygen O
2
Zero point
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
, H
2
S and CO
●
Sensitivity of O
2
