55
5 Maintenance
The following test gases can be used to check the indication ac-
curacy when supplying test gas:
Application
(group)
Test
Recommended test
gases
Inspection above
ground
Test gas 10 ppm
in 10 seconds
10 ppm CH
4
*)
Bar holes/
Gas measuring
Test gas CH4
100 % vol. CH
4
Test gas CO2
20 % vol. CO
2
Test gas C3H8
100 % vol. C
3
H
8
Structure/plants
Test gas CH4
1 % vol. CH
4
*)
Test gas CO
40 ppm CO
*)
Test gas C3H8
1 % vol. C
3
H
8
*)
Warning
Gas mixture
ExTox IR
Test gas C3H8
1 % vol. C
3
H
8
Test gas C4H10
1 % vol. C
4
H
10
Ethane analysis
Test gas 50/100
PPM C2H6
100 ppm C
2
H
6
in 1 %
vol. CH
4
(balance: syn-
thetic air)
*)
in synthetic air
If a test can be carried out either with a gas mixture or with an
individual gas, SEWERIN recommends you use the gas mixture.
If a gas mixture is used, but the device is equipped for other gas
types and gases which are not contained in the gas mixture,
these must be additionally tested with the relevant individual gas.
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.
