GX-3R Pro Operator’s Manual Chapter 3: Operation • 32
Manual Conversion
You can manually calculate a converted target gas reading using table below if the instrument’s
calibrated target gas is methane. The table below lists the conversion factors for several
hydrocarbon gases if the GX-3R Pro is calibrated to methane.
To use this table, multiply the display reading on the combustible gas channel by the factor in the
appropriate row to obtain the actual gas concentration. For example, if you are detecting ethylene
and the display reads 10% LEL for the combustible gas channel, you actually have 10% LEL x
0.83 = 8.3% LEL ethylene present.
Table 5: LEL Hydrocarbon Conversion Factors
Gas
LEL Conversion Factor
(from CH
4
Cal.)
Gas
LEL Conversion Factor
(from CH
4
Cal.)
Acetone 2.22 IPA 1.64
Acetylene 1.43 Isobutane 1.10
Benzene 2.50 MEK 2.63
Butadiene 1.52 Methane 1.00
Cyclopentane 1.45 Methanol 1.82
DME 1.16 MIBK 4.00
Ethane 0.94 MMA 3.33
Ethanol 1.96 Nonane 9.09
Ethyl Acetate 2.86 Propane 1.12
Ethylene 0.83 Propylene 0.97
Heptane 3.13 THF 2.33
Hexane 1.89 Toluene 4.55
Hydrogen 0.95 Xylene 7.69
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