Abstract
The article considers a method of flammable gases concentration measurement. Experimental unit of thermocatalytic sensor and microcontrollerwith 12-bit ADChas been constructed. Output signal(mV)dependency on different concentrations
 of flammable gases has been revealed. It is revealed that catalytic sensor sensitivity changes with temperature, and sensitivity change is unequal for different combustible gases. Thus, there is a possibility to bring results of measuring to % LEL by adding correcting coefficient Kp that characterizes reduction rate of sensing element sensitivity under temperature increase. Application of the method allowed to reduce measuring inaccuracy from 88% to 10% for hydrogen, and from 51% to 19% for hexane. The paper is related to flammable gases metrology.
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