RE: automated lights - and gas leaks...

["Bricknell, Tony" <tony.bricknell@xxxxxxx>]

>Relays are sealed, so I'd say the risk was still significantly less.
>Barring the case of an arcing relay with a cracked casing, of course.
;)

Don't be too sure ... many relays are sealed, but several higher power
per
case-size (high power, small size) relays are vented as the switching
arc
produces gasses that would otherwise de-rate the relay contacts.

CPC do a mains powered Natural Gas detector (2003 catalogue, p1688 SR01068
@
35.28).  They also do a range of Carbon Monoxide alarms.  With
the battery
operated versions you could fit their "9V to 12V Conversion PCB"
SR00543 @
9.94 (page 1686) which gives a switched relay output in an alarm condition
-
this could be taken to a Comfort input.

HTH
Tony

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