| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas alarm which can cancel user's anxiety by telling a user whether or not there is an effect in ventilation after generating an alarm. SOLUTION: A period until gas concentration detected by a gas sensor starts to fall off after the gas concentration detected by the gas sensor becomes equal to or more than an alarm value is considered as a first alarm generation period T1, and a period after the first alarm generation period T1, and until the gas concentration detected by the gas sensor becomes equal to or less than the alarm value after the gas concentration detected by the gas sensor starts to fall off is considered as a second alarm generation period T2. A CPU continuously rings an alarm buzzer during the first alarm generation period T1, continuously lights an alarm lamp, intermittently rings the alarm buzzer during the second alarm generation period T2, and intermittently lights the alarm lamp. COPYRIGHT: (C)2011,JPO&INPIT
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