5 Maintenance
│
37
5.2.2
Test gases for the adjustment
The following test gases can be used for adjustment:
Gas
Suitable test gases for
Zero point
Sensitivity
CH
4
●
Fresh air
●
Gas mixture
●
100 % vol. CH
4
●
1.00 % vol. CH
4
CO
2
●
Fresh air
●
Gas mixture
●
100 % vol. CO
2
CO
●
Fresh air
●
40 ppm CO
O
2
●
Gas mixture
●
100 % vol. N
2
●
100 % vol. CH
4
●
Fresh air
H
2
S
●
Fresh air
●
Gas mixture
●
180 ppm H
2
S
If more than one test gas can be used to adjust a gas, it does
not have to be adjusted with all test gases. However, adjusting
with more than one test gas increases the measurement quality.
Fresh air contains 20.9 % vol. O
2
and is therefore used with oxy-
gen to adjust the sensitivity.
Carbon monoxide can only be adjusted with an individual gas.
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.
