sewerin VARIOTEC 480 EX - Page 65

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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/
measuring
Test gas CH4 100 % vol. CH
4
Test gas C3H8 100 % vol. C
3
H
8
House/Spaces 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
(Rest: synthetic 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 specied
test gas concentration.