Properties of sensors made of Pt/TiO2 catalysts have been tested. Thos
e sensors are being applied in systems limiting the fuel engines exhau
st gases toxicity. Variation of electrical resistance of the sensor in
presence of gas mixture (CO + O-2 + He) has been determined at the wi
de range of temperature - from 473 to 823 K. Relation between the sens
ors' efficiency and their catalytic activity in the reaction of CO oxi
dation has been determined.