Instruction manual

Combustible Gas Sensor Specifications
Table 4-2. COMBUSTIBLE GAS - Typical Performance Specifications
RANGE
0 to 100% LEL or
0 to 5% CH
4
RESOLUTION
1% LEL or
0.1% CH
4
REPRODUCIBILITY
3% LEL to 50% LEL reading
5% LEL to full scale or
0.2% CH
4
to 2.5% Methane
0.3% CH
4
to full scale
RESPONSE TIME
90% of final reading in 30 seconds (normal temperature range)*
*See TABLE 4-1, NOTE 1.
Table 4-3. COMBUSTIBLE GAS - Cross Reference Factors for FiveStar
General-Purpose Calibration Using Calibration Cylinder (P/N 478191),
(P/N 478192), (P/N 804769), or (P/N 804770) Set to 58% LEL
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
COMBUSTIBLE GAS
MULTIPLY %LEL
READING BY
Methyl Ethyl Ketone
1.1
Methyl Tertiary Butyl Ether
1.0
Mineral Spirits
1.1
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. These 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 a
Portable Alarm. Individual units
may vary by
+ 25% from these values.
Instruction Manual Chapter 4, Performance Specifications
FiveStar Alarm 4-3