The physical principles of detecting combustible gases in air were analyzed
, and a method for determining combustible gases in air was proposed. The m
ethod is based on measuring the heat effects of chemical reactions using th
ermosensitive piezoelectric quartz crystal vibrators. Experimental results
are presented. Piezocatalytic transducers were developed for determining co
mbustible impurities in air with the detection limit of 10(-2) vol %.