Gas
1
Expected IR LEL response at 20% LEL target gas
Methane 20% LEL
Propane 28% LEL to 56% LEL
Butane 28% LEL to 56% LEL
Pentane 31% LEL to 62% LEL
Hexane 20% LEL to 48% LEL
Methanol
2
40%LEL to 80% LEL
Ethanol
2
21% LEL to 42% LEL
Hydrogen No response
Acetylene No response
1
For any gases not listed, please contact Honeywell to find the best solution for your application.
2
Please use caution when using the BW Flex Series around Methanol and Ethanol. The BW Flex
Series CO sensor may become inhibited by prolonged exposure to concentrations of Methanol
and Ethanol thus causing the unit to alarm. This condition can last up to 12 hours before the CO
sensor recovers to normal levels.
Filtered and Unfiltered Catalytic Bead Combustible (LEL)
Sensor Information
Honeywell BW Flex multi-gas detectors are offered with both filtered and unfiltered combustible
gas (LEL) sensors. The filtered LEL sensor provides enhanced resistance to airborne sensor
poisons such as volatile silicone vapors and high hydrogen sulfide gas concentrations. Due to
some molecules' physical size, the filtered LEL sensor is not typically suitable for the detection
of some compounds, including complex hydrocarbons, alcohols, ketones, and esters. The
filtered LEL sensor is suitable for detecting less complex molecules, including C1 to C6
hydrocarbons, hydrogen, and acetylene.
For applications requiring the detection of more complex compounds, select a detector with an
unfiltered LEL sensor.
Consult the following chart for assistance in selecting a suitable combustible sensor.
BW Flex Series 50 User Manual
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