On 22/11/2011 23:58, The Natural Philosopher wrote:
Me neither (yet - got some planned though). Got a feed to garden sockets
and pond, another to garage/workshop, and one for outside lights/PIRs (+
one low current socket). The garage has its own split load in it, and
that also has a feed to a shed.
There has been some discussion here before, based on half-lives, as to
whether the expiry date is absolute, or just a guideline for people
who don't test them. Mine are 20 years old and still detect my burning
the toast, so I suppose they're OK. They do beep when the battery is
low. This is exacerbated by lower temperatures, as when the heating
goes off at night. Was the "false alarm" just a slow series of low-
battery beeps or a full-blown screech?
The 10 year live is because you can't clean the ionisation chamber,
and sticky dirt will eventually short out the ionisation current flow,
causing the alarm to go off.
Don't even think about taking the ionisation chamber apart to clean
it (too risky given the radioactive source in it).
Just chuck it out and buy a new one.
[email address is not usable -- followup in the newsgroup]
On Fri, 11 Nov 2011 17:03:23 +0000, Frederick Williams wrote:
They contain a tiny (0.3 micro grams) amount of Americium 241
principally an alpha emitter. Alpha particles are big (a Helium-4
nucleus) and don't travel very far, even in air, before being
absorbed. A sheet of paper will stop them.
Having said that you don't want to ingest an alpha emitter and have
it lodge somewhere. It will damage tissue, in it's immediate
vicinity, over a period of time.
I've not heard of special collection or disposal facilities for smoke
detectors in the UK. But then I haven't been looking.
Well there seem to be two kinds, ones with radiation hazard stickers and
ones without,both seem to give false alarms at times. I think the former can
decay so they just don't work at all once the radiation reduces to the point
where nothing gets ionised.
Brian Gaff - email@example.com
Note:- In order to reduce spam, any email without 'Brian Gaff'
On Sat, 12 Nov 2011 13:35:29 -0000, The Natural Philosopher
Everything sets the pesky things of, which is why I removed them all.
Why would I want to be warned of a fire right next to me anyway? The only alarm
I have now is in my indoor aviary (well the detector is, the sounder is in the
house) so I know if the parrots are on fire.
In my case no, only two things set them off. Falsely. fat frying and
But they don't exist in the kitchen or bathroom, so that's a matter of
keeping the door closed.
I was deeply grateful they DID go off when a log rolled out of the
unattended fire into the hearth...
And, as fire officer in my business years ago, and as someone who has
watched his brother in law's house burn to the ground, fought by a
friends who happens to be the part time fire chief, there is no way I
am taking mine out, even if it did NOT invalidate my house insurance.
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