Honeywell 705 Combustible Gas Sensor



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  • Range depends on control card
    • 0 to 20% or 100% LEL
  • Alarm trip points as low as 5% LEL
  • mV bridge output signal
  • Linearity better than ±5% fsd
  • Repeatability better than ±2% LEL
  • Poison resistant detectors
  • Fast speed of response
  • 5-year warranty
  • Certified for hazardous location operation
    • Class 1, Div 1, groups B, C and D

The Honeywell 705 Combustible Gas Sensor is an explosion proof assembly, fitted with poison-resistant combustible gas detection elements. Fully encapsulated, it is designed for use in hazardous locations. The Sensor is electro-catalytic and consists of 2 beads of refractory oxide, formed on a fine platinum wire coil. The active bead is coated with a catalyst material, while the reference bead is glass coated.

In the presence of gas, the catalyst coated bead promotes the oxidation of the gas, causing it to heat up and increase in electrical resistance. This change of resistance, relative to the reference bead, can be measured and is in direct proportion to the concentration of combustible gas.


Honeywell 705 Replacement Gas Sensors
Replacement combustible (LEL) gas sensor for the Honeywell 705


Please consider these optional accessories.

Honeywell Weatherproof Cap
Weatherproof cap for use with combustible detector, including remote gassing nozzle
Honeywell Flow Housing
Sample Flow Housing
Honeywell Stainless Steel Weather Protection
Stainless steel weather protection for Honeywell 705HT combustible sensors
Honeywell Weatherproof Cap
Weatherproof cap for use with toxic detector, including remote gassing nozzle
Honeywell Junction Box Assembly
UL/CSA aluminum 6 wire junction box assembly
Honeywell 705 Calibration Kit
Includes accessories needed to perform calibrations on the Honeywell 705 HT combustible gas sensor (does not include calibration gas)
Honeywell Calibration Gas
Combustible & toxic gases for Honeywell calibration kits