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Posted by kim on 09/12/06 00:53
"Colin Wilson" <void@btinternet.com> wrote in message
news:MPG.1f6fe71c11e8004a9898fa@news.individual.net...
> > PS> Nige - Do you know anything about burglar alarms?? - Ours keeps
going
> > off while we're out!
>
> What are the symptoms ? - is it always a particular zone ?
>
> How is that zone monitored - passives, pressure pads, mag contacts ?
>
> If its a passive, is it pointing towards a window that may have a
> draught or strong varying sunlight hitting it ? (they're sometimes a
> little over-sensitive under these circumstances, and may be more suited
> to being placed facing away from a window if possible) - have you taken
> the cover off it to make sure it hasn't got a visiting spider ?
>
> Pressure pads deteriorate with age - the tinfoil starts to flake. No
> solution other than to replace it.
>
> Magnetic contacts are generally reliable, but its possible that the
> expansion and shrinkage of doors / frames might just be enough to cause
> it to trigger - particularly if rattled by wind...
>
> If you're getting it on a particular zone, the other thing to try might
> be to short out the passive etc to see if it still triggers - if so,
> you're looking at a wiring fault. If you have a tamper circuit on that
> zone, you might be able to extricate that from the panel (they're often
> wired in series across all zones) and utilise those pairs if the wiring
> is OK - shouldn't be too much of an issue as most circuits are now
> configured as always on, rather than always off and switching on under
> alarm conditions.
>
> It may even be a duff panel or knackered backup battery causing it* but
> i'd try to rule out the other circuits first :-}
>
> * we once had a problem caused by a faulty SCB module in the bellbox
Then again, it's just possible they're being burgled every time they go out
:o)
(kim)
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