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21 • Measuring Mode, Alarms GX-2003 Operator’s Manual

The table below lists the conversion factors for several hydrocarbon

gases for the % LEL combustible sensor if it is calibrated to

methane. Conversion factors are not available for the % volume TC

sensor. To use this table, multiply the display reading on the CH

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 CH

channel, you actually have 10%

LEL x 1.35 = 13.5% LEL pentane present.

Measuring Mode, Alarms

This section covers alarm indications in Measuring Mode. It also tells

you how to reset the GX-2003 after an alarm has occurred and how to

respond to an alarm condition.

NOTE: False alarms may be caused by radio frequency (RF) or

electromagnetic (EMI) interference. Keep the GX-2003 away

from RF and EMI sources such as radio transmitters or large

motors.

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

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RKI Instruments GX-2003 Betreibershandbuch Seite 28