| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an alarm device which reports an alarm more quickly corresponding to surrounding conditions while preventing a false report of the alarm.SOLUTION: An alarm device includes a gas sensor which detects detection object gas, and an alarm section which alerts based on concentration of the detected gas. The alarm device reports a first stage alarm when a first predetermined time has elapsed since gas concentration became a first stage set point or higher, and reports a second stage alarm when a second predetermined time has elapsed since the gas concentration became the first stage set point or more and the gas concentration is a second stage set point or higher.</p> |
