| 摘要 |
An optical smoke and like particle detector housing in which light from a lamp is protected along one axis and scattered by particles along a second axis to a photocell has a particle simulating device for testing the operativeness of the cell and its associated alarm circuit. The particle simulating device comprises a thin wire mounted on a bell crank manually operated outside the detector housing to swing the wire through the detection zone at the intersection of the lamp and photocell axes so as to scatter light from the lamp to the cell in the same way and amount as particles in the zone. |
