Technical Data
MSA
ALTAIR 4X
GB
53
Response notes
(1) Some compounds may reduce the sensitivity of the combustible gas sensor
by poisoning orinhibiting the catalytic action or by polymerizing on the catalytic
surface.
(2) Multiply the displayed %LEL value by the conversion factor above to get the
true %LEL.
(3) These conversion factors should be used only if the combustible gas is known.
(4) All factors are based on the IEC 100% LEL levels
i.e. Methane 100% LEL = 4.4 Vol%,
Pentane 100% LEL = 1.1 Vol%
Propane 100% LEL = 1.7 Vol%
(5) These conversion factors are typical. Individual units may vary by ±25% from
these values.
n-Hexane
1.86
1.06
Hydrogen
0.98
0.56
Isobutane
1.63
0.93
Isopropyl Alcohol
1.55
0.88
Methane
1.00
0.57
Methanol
0.93
0.53
Methyl Ethyl Ketone
1.69
0.97
Nonane
4.48
2.56
Nonane with EX-H
sensor
3.03
1.73
Pentane
1.90
1.00
Propane
1.39
0.79
Toluene
1.14
0.93
Xylene
2.09
1.19
Isobutane
4.83
2.76
Xylene with EX-H
sensor
3.57
2.04
Combustible Gas
Methane Calibration
1.45 Vol % CH
4
Set
33% LEL
Pentane Simulant Calibration
1.45 Vol % CH
4
Set 58 %LEL
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