76
7 Appendix
7.2.4
Setting ranges for gas types
LEL values are specified as per
The setting for AL1 must not exceed the setting for AL2.
Gas type
AL1
AL2
All C
x
H
y
in
% LEL
Threshold
10 % LEL
50 % LEL
CH
4
Threshold
0.45 % vol.
2.20 % vol.
Setting range
0.20 – 2.60 % vol.
0.25 – 2.65 % vol.
Increment
0.05 % vol.
0.05 % vol.
C
3
H
8
Threshold
0.17 % vol.
0.86 % vol.
Setting range
0.08 – 1.00 % vol.
0.10 – 1.02 % vol.
Increment
0.02 % vol.
0.02 % vol.
C
4
H
10
Threshold
0.14 % vol.
0.7 % vol.
Setting range
0.08 – 0.82 % vol.
0.10 – 0.84 % vol.
Increment
0.02 % vol.
0.02 % vol.
CO
2
Threshold
0.5 % vol.
1.0
% vol.
Setting range
0.1 – 4.99 % vol.
0.11 – 5.0 % vol.
Increment
0.01 % vol.
0.01 % vol.
O
2
Threshold
18.0 % vol.
23.0
% vol.
Setting range
0.5 – 20.5 % vol.
21.2 – 25.0 % vol.
Increment
0.1 % vol.
0.1 % vol.
H
2
S
Threshold
5 ppm
20 ppm
Setting range
5 – 99 ppm
6 – 100 ppm
Increment
1 ppm
1 ppm
CO
Threshold
30 ppm
60 ppm
Setting range
5 – 499 ppm
6 – 500 ppm
Increment
1 ppm
1 ppm
Factory settings in
bold
