COMBUSTIBLE GAS
MULTIPLY
%LEL
READING BY
Acetone 1.1
Acetylene 0.7
Acrylonitrile
1
0.8
Benzene 1.1
Butane 1.0
1,3 Butadiene 0.9
n-Butanol 1.8
Carbon Disulfide
1
2.2
Cyclohexane 1.1
2,2 Dimethylbutane 1.2
2,3 Dimethylpentane 1.2
Ethane 0.7
Ethyl Acetate 1.2
Ethyl Alcohol 0.8
Ethylene 0.7
Formaldehyde
2
0.5
Gasoline (unleaded) 1.3
Heptane 1.1
Hydrogen 0.6
n-Hexane 1.3
Isobutane 0.9
Isobutyl Acetate 1.5
Isopropyl Alcohol 1.1
Methane 0.5
Methanol 0.6
Methyl Isobutyl ketone 1.1
Methylcyclohexane 1.1
Methyl Ethyl Ketone 1.1
Methyl Tertiary Butyl Ether 1.0
Mineral Spirits 1.1
COMBUSTIBLE GAS
MULTIPLY
%LEL
READING BY
iso-Octane 1.1
n-Pentane 1.0
Propane 0.8
Propylene 0.8
Styrene
2
1.9
Tetrahydrofuran 0.9
Toluene 1.1
Vinyl Acetate 0.9
VM&P Naptha 1.6
0-Xylene 1.2
RESPONSE NOTES:
1. The compounds may reduce the
sensitivity of the combustible gas
sensor by poisoning or inhibiting the
catalytic action.
2. hese compounds may reduce the
sensitivity of the combustible gas
sensor by polymerizing on the catalytic
surface.
3. For an instrument calibrated on
Pentane, multiply the displayed %LEL
value by the conversion factor above
to get the true %LEL.
4. These conversion factors should be
used only if the combustible gas is
known.
5. These conversion factors are typical
for an Orion Multigas Detector.
Individual units may vary by
+ 25%
from these values.
Table 7-3. COMBUSTIBLE GAS - Typical Performance Specifications
RANGE
0 to 100% LEL
RESOLUTION
1% LEL
REPRODUCIBILITY
3% LEL to 50% LEL reading
5% LEL to full scale or
RESPONSE TIME
90% of final reading in 30 seconds (normal temperature
range)*
*See TABLE 7-2, NOTE 1.
Table 7-4. COMBUSTIBLE GAS - Cross Reference Factors for Orion
General-Purpose Calibration Using Calibration Cylinder (P/N 478191),
(P/N 478192), (P/N 804769), or (P/N 804770) Set to 58% LEL
Operating Manual Chapter 7, Performance Specifications
7-3
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