How Combustible Gas Detecting Instruments Detect Gas

How combustible (percent LEL) gas detecting instruments detect gas

Catalytic "Hot Bead" Combustible Sensor

• Detects combustible gas by catalytic oxidation
• When exposed to gas oxidation reaction causes bead to heat
• Requires oxygen to detect gas!

Simplified Balanced Wheatstone Bridge

Combustible sensors detect gas by catalytic combustion