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Appendix B
Relative Combustible Response
The Innova is normally calibrated with methane gas, but responds to a variety
of hydrocarbons (refer to Table B-2).
Table B-2
Relative Response of New Innova Series LEL/ppm
Hydrocarbon Indicator to Various Gases and Vapors
GAS or VAPOR
LEL RANGE
PPM RANGE
% LEL
VOL
CONVERSION FACTOR:
CONVERSION FACTOR:
VS. HEXANE
VS.
METHANE
VS. HEXANE
VS.
METHANE
Acetone
2.5
0.73
1.7
1.6
0.48
Acetylene
2.5
0.63
1.5
1.2
0.34
Benzene*
1.2
1.0
2.3
1.0
0.30
Butadiene, 1, 3-
2.0
0.52
1.21
0.98
0.29
Carbon Monoxide
12.5
0.39
0.9
5.9
1.8
Chloroform*
NONE
-
-
9.8
3.0
Dimethyl
Formamide*
2.2
1.4
3.3
2.7
0.81
Ethyl Acetate*
2.0
0.9
2.1
1.6
0.48
Ethyl Alcohol
3.3
0.70
1.6
2.1
0.64
Heptane
1.05
1.00
2.3
0.99
0.30
Hexane
1.1
1.00
2.3
1.0
0.30
Hydrogen
4.0
0.33
0.7
1.3
0.39
Methane
5.0
0.43
1.0
3.3
1.0
Methyl Chloroform
7.5
0.68
1.6
4.9
1.5
Methyl Ethyl Ketone
1.4
1.09
2.5
1.7
0.52
Pentane
1.5
0.71
1.7
1.0
0.30
Propane
2.1
0.56
1.3
1.3
0.39
Propyl Acetate*
1.7
0.77
1.8
1.4
0.42
Propyl Alcohol, iso-
2.0
0.89
2.1
1.9
0.58
Propyl Alcohol, n-
2.2
0.81
1.9
1.9
0.58
Styrene Monomer
0.9
4.2
9.7
2.7
0.82
Toluene
1.1
1.2
2.9
1.2
0.36
Trichloroethylene
8.0
1.0
2.4
6.8
2.1
Xylenes, isomer mix
.9-1.1
3.0
7.0
1.7
0.52
*
These response factors are estimates, based on factors for 6 volt Thermo Fisher Scientific sensor adjusted for characteristics of Innova
sensor.
Please note that response varies from one sensor to another and the relative response of a sensor can change with the age of the sensor. These data
should be used for estimation purposes only.
Assuming an instrument calibrated directly for hexane or methane, but used to observe a different gas, the equivalent response in % LEL (or ppm)
for that gas is secured by multiplying the observed% LEL (or ppm) reading by the LEL (or ppm) scale conversion factor.
