MSA Orion Manual De Operaciones página 75

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