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24
Gas
Chemical
Formula
LEL
(%)
LSE
(%)
Flash
point
(°C)
Vapor
density
Coefficient
-
Calibration gas
CH4 (methane)
Coefficient
-
Calibration gas
H2 (Hydrogen)
Coefficient
- Calibration gas
C4H10 (Butane)
Coefficient
- Calibration gas
C5H12
(Pentane)
Hexane
C6H14
1,20
7,40
-23
3,0
2,10
1,70
1,15
1,00
Hydrogen
H2
4,00 75,60
-
0,069
1,00
Isobutane
C4H10
1,50 8,40
-83
2,0
1,50
1,20
0,80
0,75
Isobutene
C4H8
1,60 10,00
<-10
1,9
2,20
1,80
1,20
1,05
Isopropanol
C3H8O
2,15 13,50
11,7
2,1
1,60
1,30
0,85
0,80
Kerosene
(JP4)
C10 -
C16
0,70 5,00
> 50
> 4
5,00
4,00
2,65
2,40
Methyl
Methacrylate
C5H8O2
2,10 12,50
2
3,5
2,25
1,80
1,20
1,10
Methane
CH4
5,00 15,00
-188
0,55
1,00
Methanol
CH3OH
5,50 44,00
11
1,1
1,40
1,15
0,75
0,70
Naphta
melange
(Mixture)
0,90 5,90
> 44
> 4
3,50
2,80
1,85
1,70
Nonane
C9H20
0,70
5,60
31
4,4
4,40
3,55
2,35
2,10
Octane
C8H18
1,00
6,00
12
3,9
2,70
2,20
1,45
1,30
Ethylene
Oxyde
C2H4O
2,60
100
-20
1,5
2,10
1,70
1,15
1,00
Propylene
oxide
C3H6O
1,90 37,00
70
2,0
2,35
1,90
1,25
1,15
Pentane
C5H12
1,40
8,00
-49
2,5
1,00
Propane
C3H8
2,00
9,5
-104
1,6
1,55
1,25
0,85
0,75
Propylene
C3H6
2,00 11,70 -107,8
1,5
1,65
1,35
0,90
0,80
Styrene
C8H8
1,1
8,00
31
3,6
6,30
5,05
3,35
3,00
Gasoline lead
free
/
1,10 ~6,0
21
3 à 4
1,80
1,45
0,95
0,90
Toluene
C7H8
1,20
7
5
3,1
4,00
3,20
2,15
1,90
Turpentine
Oil
-
0,8
6,0
35
4,7
3,50
2,80
1,85
1,70
Triethyl
amine
C6H15N
1,20
8
-15
3,5
2,05
1,65
1,10
1,00
White Spirit
melange
(Mixture)
1,10 6,50
>30
> 4
3,50
2,80
1,85
1,70
Xylene
C8H10
1,00
7,60
25
3,7
4,00
3,20
2,15
1,90
Sensors with a grey background: gases recommended for calibrating the detector (VQ1)
Example (second row of table): calibration of an Acetone detector using 1% butane (by volume) as
the calibrating gas.
Value to be displayed:
1% (butane injected) x 100 x 0.90 (Butane/Acetone coefficient) = 60% LEL
1.5% (butane LEL)
N.B.:
-
LELs vary depending on the source. Those values shown here are taken from European
Standard EN 50054
-
Coefficients are accurate to
15%