GX-6000 Operator’s Manual Measuring Mode, Normal Operation • 32
Table 5: LEL Hydrocarbon Conversions
• The GX-6000 provides the catalytic combustible sensor with some
protection against exposure to high levels of combustible gas which can
damage the sensor. It does this by turning off the combustible sensor
power temporarily when it determines that an over scale (more than 100
%LEL) concentration of combustible gas is present that may damage the
sensor. Nevertheless, concentrations of combustible gas of more than 100
%LEL can still affect the zero level or calibration of the combustible
sensor if the concentration is high enough.
CAUTION: Do not expose the catalytic combustible sensor to high
concentrations of combustible gas such as that from a butane
lighter. Exposure to high concentrations of combustible gas may
adversely affect the performance of the sensor.
CAUTION: Any rapid increase in the combustible gas reading on the
catalytic combustible channel followed by a declining or erratic
reading may indicate a gas concentration above the LEL which
may be hazardous.
• Some gases such as silicone vapors, chlorinated hydrocarbons, and
sulphur compounds can contaminate the detection elements inside the
combustible sensor damaging the sensor and result in reduced response to
combustible gas. Make every effort to avoid these gases.
Gas
LEL Conversion
Factor (CH
4
Cal.)
Gas
LEL Conversion
Factor (CH
4
Cal.)
Acetone 1.79 Iso Butane 1.47
Acetylene 1.92 MEK 2.27
Benzene 2.00 Methane 1.00
Ethane 1.09 Methanol 1.92
Ethanol 2.50 Pentane 1.56
Ethylene 1.06 Propane 1.35
Heptane 2.50 Propylene 1.32
Hexane 2.08 Toluene 3.13
Hydrogen 1.25 Xylene 4.27
IPA 2.78
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