| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress the occurrence of erroneous detection due to foreign matters such as dust. <P>SOLUTION: In a body A of the smoke type fire sensor, entrance prevention walls 12 are disposed vertically above an inlet 54 of a sensor section 5. The structure can prevent foreign matters from entering into the inlet 54 and accumulating there, and thereby suppressing the occurrence of erroneous detection of a fire due to foreign matters such as dust. <P>COPYRIGHT: (C)2012,JPO&INPIT |
