| 摘要 |
Provided is a smoke alarm device (10) comprising a motion detection module (14) for generating a motion detection signal on detecting human motion within a detection zone, a primary sensing module (16) arranged to generate an alarm signal where the primary sensing module senses a hazardous condition, at least one secondary sensing module (18) arranged to generate an alarm signal where the secondary sensing module senses a hazardous condition, and a controller (20) arranged to activate an audible alarm module (22) on receiving any of said alarm signals. The controller has a timer and is arranged to be in a hush state for a preset time period upon receiving said motion detection signal. In said hush state, the controller is arranged to activate the audible alarm module upon receiving alarm signals from both the primary and the at least one secondary sensing modules, or from either the primary or any one of said at least one secondary sensing module. |
