Platinum Metals Rev., 1989, 33, (4), 180
Monitoring Combustible Gases
A recent report from Case Western Reserve University, Cleveland, Ohio, describes an experimental study of miniature thick-film calorimetric sensors which show good sensing characteristics for carbon monoxide, hydrogen and hydrocarbon gases. (A. Chen, R. Luo, T.-C. Tan and C.-C. Liu, Sens. Actuators, 1989, 19, (3), 237–248).
A pair of identical platinum heater/resistance thermometer films are employed; one is coated with a platinum black or palladium oxidation catalyst while the other serves as a compensating element. Any resistance change due to heat released on catalysis can be related to the concentration of the combustible gas.