| 摘要 |
<p>An alarm for detecting radiation and/or pollutants such as smoke, carbon monoxide or the like. The alarm is arranged to interconnect between a light fitting and a light source such as a bulb. The alarm may be powered by the light fitting when the light fitting is energised and may be powered by a battery when the light fitting is de-energised. The alarm has control means responsive to the energising and de-energising of the light fitting a preset number of times over a preset time period to apply a reset signal to the alarm thereby to reset the alarm in the event of accidental triggering thereof.</p> |
