| 摘要 |
PURPOSE:To prevent the malfunctioning of a device due to gas other than the detected gas, by a method wherein a main gas detecting element and an auxiliary gas detecting element, which are different in gas detecting property, are employed, and when an output from a gas detecting element is applied, an alarming system is brought into a state to be free from operation. CONSTITUTION:A main gas detecting element 1a is heated to a high temperature by a heater 2a so that it can have a high gas detecting sensitivity to detecting gas, such as butane, hydrogen, methane. An auxiliary gas detecting element 1b is heated to a low temperature by a heater 2b so that it can have a high detecting sensitivity to the gas other than the detecting gas, for example, water vapor, alcohol vapor, and have a low gas detecting sensitivity to detecting gas. If leakage of gas, such as butane or methane, occurs, the main gas detecting element 1a is decreased in the resistance but the resistance of the auxiliary gas detecting element 1b does not change, which enables an electronic buzzer B to function. In case water vapor or alcohol vapor is produced, the main and auxiliary detecting elements 1a and 1b are decreased in the resistance, and thereby the electronic buzzer B does not operate. |
