CARBON MONOXIDE GAS DETECTING DEVICE AND CARBON MONOXIDE GAS DETECTING METHOD UTILIZING ITS DEVICE

摘要

PURPOSE: To enable highly accurate detection of CO by providing a catalytic layer, changing CO gas into methane or methanol, and detecting CO gas concentration indirectly from its concentration. ;CONSTITUTION: It is detected by electrode leads 8 and 9 that the resistant values of metallic oxide semi-conductors 6 and 7 heated to 300 to 450°C varies by adsorption of gas on the surface of them. For example, when SiO₂ or Al₂O₃ as acid carrier is used, hydrocarbon such as methane, etc., is generated through the cutting of carbon-oxygen bond of adsorped CO. Then the concentration of the CO gas is converted into CH₄ concentration by an output conversion from an output to the product CH₄ in a CO gas detecting device with a catalytic layer in which methane is generated, and converted into CO concentration by multiplying CH₄ concentration by a conversion factor K₄ in a concentration conversion circuit. Thus CO can be detected indirectly by the detection of CH₄.;COPYRIGHT: (C)1994,JPO&Japio