Re: NOW: PIRs WAS: Stair Mats

["Frank Mc Alinden" <armagh@xxxxxxx>]

Hi Ken + Mark
                       
The best way of detecting someone with a pir is to
position it so that they walk across the sensor and not into it . I use
Pulnix Sensors ceiling mount and very good..Some have pulse count links
on
them so you can set it up to alarm after say 2 counts or 4.....If using
for
occupancy as  only then a 2 pulse count  is better...There are
two types of
lenses ( im aware of) Freznel and mirror......the mirror is supposed to
be
better than the freznel......Another good detector is one made in Italy
i
believe by a company i think called Alarmcom.................

HTH

Frank



----- Original Message -----
From: "Kenneth Watt" <kwatt@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, October 15, 2002 9:09 PM
Subject: RE: [ukha_d] NOW: PIRs WAS: Stair Mats


> > OK - what do you find the most reliable in the way of PIRs,
then?
>
> The ones I got from Simon at Ecolume are superb for occupancy
detection
> (which reminds me to talk to him actually) they are the ceiling
mounted
> ones very, very good PIRs.
>
> The "pet immune" ones are virtually useless for occupancy,
but if you
> have pets then there are not a lot of options there.
>
> The "mini-PIR" is okay, but not the best for occupancy.
>
> I got some cheapo ones from B&Q [you should try that shop! :D]
that work
> very well indeed, but usual B&Q no-name stuff.
>
> I also got some from a local supplier which were made by Honeywell
and
> these are excellent for occupancy as well. These are also like
normal
> PIRs but seem to be more sensitive than the others, whilst retaining
the
> "normal" PIR mounting and, more importantly, wiring.
>
> The one huge caveat with PIRs in general is positioning IME, if they
are
> not positioned correctly then they won't work. By that the I include
the
> direction they are aimed in, the height and what kind of room/area
they
> are in, often in larger rooms and especially hallways more than one
is
> needed to give reliable coverage. Obviously if positioning is an
issue
> then the more sensitive you can get the PIR the better.
>
> HTH
>
> K.
>
>
>
>
> http://www.automatedhome.co.uk
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