Ambient condition alarm for connecting to a light fitting

G - Physics – 08 – B

Patent

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Details

G08B 21/12 (2006.01) F21V 33/00 (2006.01) G08B 17/10 (2006.01) G08B 29/12 (2006.01)

Patent

CA 2313190

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.

L'invention porte sur une alarme permettant de détecter des radiations et/ou des matières polluantes telles que la fumée, le monoxyde de carbone ou analogue. L'alarme est agencée de façon à s'interconnecter entre un dispositif d'éclairage et une source lumineuse telle qu'une ampoule. L'alarme peut être activée par le dispositif d'éclairage lorsque ce dernier est parcouru par le courant, ainsi que par une batterie lorsque le dispositif d'éclairage n'est plus parcouru par le courant. L'alarme comporte un organe de commande réagissant à la mise sous tension et à la mise hors tension du dispositif d'éclairage un nombre de fois prédéterminé, sur une durée prédéterminée, de façon à envoyer à l'alarme un signal de remise à zéro qui permet de remettre à zéro l'alarme en cas de déclenchement accidentel.

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