Oldham OLCT 20 - Page 27

8 – Technical Specifications
23
Gas
Molecular
formula
LEL
(% v/v)
UEL
(% v/v)
CH4
coef.
H2
coef.
C4H10
coef.
C5H12
coef.
Styrene (vinyl
benzene)
C
8
H
8
1.1
8.00
6.30
3.35
3.00
Premium unleaded
gasoline (95)
-
1.10
~6.0
1.80
0.95
0.90
Toluene
C
7
H
8
1.20
7
4.00
2.15
1.90
Turpentine oil
-
0.8
6.0
3.50
1.85
1.70
Triethylamine
C
6
H
15
N
1.20
8
2.05
1.10
1.00
White spirit
mixture
1.10
6.50
3.50
1.85
1.70
Xylene
C
8
H
10
1.00
7.60
4.00
2.15
1.90
Items in gray: recommended gas for calibrating the detector.
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%.