| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress degradation of detection accuracy in gas to be detected by guaranteeing air permeability through surrounding atmosphere of an alarm device. <P>SOLUTION: An alarm device comprises: a case body 10 constituting a housing; a vent hole which penetrates the inside and outside of the case body 10 and where surrounding atmosphere of the case body 10 is flowed into a sensor chamber. The vent holes 13a are separately formed on more than two surfaces 10b-10e which constitute the case body 10. <P>COPYRIGHT: (C)2013,JPO&INPIT |
