What is the principle of detecting flammable gases?
Combustible gases (methane, LPG, propane, hydrogen, acetylene) can be detected according to the principle of catalytic combustion.
Catalytic combustion sensors are high-temperature sensors. The detection element of the catalytic element is formed by wrapping alumina and adhesive on the platinum wire coil (φ0.025~φ0.05) to form a spherical shape, and the current is passed through the platinum wire to keep the detection element constant. High temperature (300~400°C).
At this time, if it comes into contact with combustible gas such as methane gas, methane will burn on the catalyst layer, and the essence of combustion is the reaction between methane adsorbed on the surface of the element and adsorbed oxygen ions.
Note: There should be enough oxygen in the detection environment. In an oxygen-free environment, this detection method cannot detect any flammable gases.
