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Molecular
Gas
formula
C
Octane
8
Ethylene oxide
C
2
(epoxyethane)
Propylene oxide
C
3
(epoxypropane)
C
Pentane
5
C
Propane
3
C
Propylene
3
Styrene (vinyl
C
8
benzene)
Premium unleaded
gasoline (95)
C
Toluene
7
Turpentine oil
Triethylamine
C
6
mixture
White spirit
C
Xylene
8
Items in gray: recommended gas for calibrating the detector.
Table 3: calibration coefficients for standard catalytic sensors (VQ1)
Example
Calibration of an "acetone" detector using a calibration gas with 1% butane
Value to be displayed:
1% (injected butane)
x 100 x 0.90 (butane/acetone coefficient) = 60% LEL
1.5% (butane LEL)
Note:
■
LELs vary according to the source.
■
Coefficients are accurate to ± 15%.
LEL
UEL
(% v/v)
(% v/v)
H
1.00
6.00
18
H
O
2.60
100
4
H
O
1.90
37.00
6
H
1.40
8.00
12
H
2.00
9.5
8
H
2.00
11.70
6
H
1.1
8.00
8
-
1.10
~6.0
H
1.20
7
8
-
0.8
6.0
H
N
1.20
8
15
1.10
6.50
H
1.00
7.60
10
CH4
H2
C4H10
coef.
coef.
coef.
2.70
1.45
2.10
1.70
1.15
2.35
1.90
1.25
2.10
1.15
1.55
0.85
1.65
0.90
6.30
3.35
1.80
0.95
4.00
2.15
3.50
1.85
2.05
1.10
3.50
1.85
4.00
2.15
10 – Accessories
C5H12
coef.
1.30
1.00
1.15
1.00
0.75
0.80
3.00
0.90
1.90
1.70
1.00
1.70
1.90
82
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