"Mark" wrote in message
...
On Wed, 20 Nov 2013 14:13:41 +0000, MM wrote:

On Tue, 19 Nov 2013 14:28:40 -0800 (PST), wrote:

Hello,

I presently have two mains interlinked smoke alarms with battery back up.
Unfortunately one is faulty and keeps sounding. I have tried cleaning it
with a hoover but no luck. I am interested in whether all mains
interlinked smoke alarms with batteries are the same. Basically, if I
bought another two interlinked alarms that were a different make could I
simply replace the current two by copying the connections?

In my house, when this started happening with one of the alarms, I
could only silence all three by replacing the batteries in all three.
Then, finally, the chirping ceased.



Mine chirp every 30s when the battery is low. Typically this happens
in the middle of the night. When it happened last time I had no spare
batteries and discovered that, even when the battery was removed, the
chirping continued.

Mark

The chirping often happens in the middle of the night as that is when the
temperature of the house drops, that temperatrure drop also drops the
voltage on the battery and the alarm starts to chirp (it detects the low
voltage on the battery).

It goes without saying that removing the battery removes all voltage from
the battery and so the alarm sees the voltage as low regardless of
temperatu-)

Cheers
--
Adam


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