| 摘要 |
PROBLEM TO BE SOLVED: To provide an alarm unit capable of reducing affect applied to a detection performance for detecting gas, due to contamination of an oil content.SOLUTION: An alarm unit 1 comprises a nonwoven fabric 10 on a front face of a gas sensor 20, and a position exposed from a vent hole 6a of a plate 6 forming the front face part of the alarm unit is covered with a protection part 11a of a cover member 11. |
