RKI Instruments GX-2001 Manual - Manual (Page 19)

Model GX-2001 Operator’s Manual Operation • 14
Combustible Gas Detection
There are two issues that must be considered when checking for
combustible gas.
• The combustible sensor will respond to any combustible gas. The
standard calibration for the GX-2001 combustible channel is to
methane (CH4). If the instrument is to be used to monitor for a different
combustible gas, such as hexane or propane, it should be calibrated to
that gas.
The table below lists the conversion factors for several hydrocarbon
gasses if the GX-2001 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 pentane and the display reads 10% LEL
on the combustible channel, you actually have 10% LEL x 1.35 = 13.5%
LEL pentane present.
Table 3: LEL Hydrocarbon Conversions
Gas
LEL Conversion
Factor (Methane
Calibration)
Gas
LEL Conversion
Factor (Methane
Calibration)
Acetone 1.92 Iso Butane 1.56
Acetylene 2.00 MEK 1.92
Benzene 2.00 Methane 1.00
Ethane 1.25 Methanol 1.65
Ethanol 1.75 Pentane 1.35
Ethylene 1.20 Propane 1.52
Heptane 1.92 Propylene 1.33
Hexane 1.65 Toluene 2.00
Hydrogen 1.00 Xylene 0.93
IPA 2.50