"Dave Plowman" wrote in message
...
In article ,
Dave wrote:
that would be handy - I might change our 3 PIRs to these immune ones if
they arent too expensive

Some give you a choice of lenses - the idea being to avoid ground level
and therefore pets. Of course, cats can jump up on things. But if yours
are this type you might be able to buy the lenses only and experiment.
A pal who had several cats avoided PIRs altogether and relied on shock
sensors. But had loads of false alarms.

IMHO, if you can be bothered with the work, sensors on all the external
doors and windows are pretty reliable, unless you are 'attacked' by a pro
burglar.


The new Pet Immune PIR's don't miss any of the floor area David, and can
actually have a look down lens on the bottom. They work by ignoring the
heat signature of small mamals, that is why they are rated to the weight of
the animal. The rating gives you the immunity level to work by and if you
have a cat heavier than 35kg then it is obese and should be put on a diet.

We had one customer who asked for pet immune detectors so she could let her
cats, and I mean loads of them, roam around the back kitchen. Then a few
weeks later she complained because the neighbours dog she was looking after
set the alarm off. Well you should've seen the size of this rottwheiler
(spelling) it was bigger than the two engineers put together. When we tried
to explain that the detector was set to the weight of the animal she didn't
beleive us and thought it was the detector that recognised if it was dog or
cat running around on the floor.

Still laugh about it on an almost daily basis.


--
*No husband has ever been shot while doing the dishes *

Dave Plowman London SW 12
RIP Acorn


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