Re: PIR Options

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

Hi All
             I
have used many different pir sensors over the years as  i
worked  on and off in the security industry . My personal first choice
is
Pulnix sensors and secondly and also IMO a great detector is the
Alarmcon
210 sensor and 220 these are now outdated i think the new ones are
called
310 + 320 etc but  i used lots of them in large commercial stores here
in
Melbourne . Also i was speaking via email to the President of Pulnix
America
( a Scot) and he said that they were developing a pir for the HA market
he
wouldnt elaborate but will let me know when its ready. If your interested
i
have a couple of pics on my site  and a link to pulnix sensors. I
also
purchase my cctv stuff from them. www.users.bigpond.com/armagh/

Frank Mc
----- Original Message -----
From: "psghome2002" <psghome@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Thursday, July 18, 2002 7:22 PM
Subject: Re: [ukha_d]PIR Options


> I trialled a few different PIR's for the same use (there's been a
> lot of discussion about this on here before). I wanted the
'perfect
> PIR' that had to meet the following criteria:
>
> 1) Quick triggering
> 2) Stable so as not to give false alarms when used as security PIR
> 3) Looks good
> 4) Ability to turn On/Off LED
> 5) Interchangeable Lens for wide/curtain mode detection.
>
> Point 1 is normally part dealt with by user selectable 'pulse
count'
> i.e. how many detection pattern 'beams' need to be broken to
trigger
> and the internal logic used by the detector (and how quick it is).
> Generally it is best to go for a sensor that allows a pulse count
of
> between 1 and 4, although most will start at 2 for stability (low
> false-alarm) reasons.
>
> I must say that I have still not found the ideal sensor - I have a
> combination of:
>
> Alarmcom IR120C - look really good, use great 'black mirror'
> technology (cutting down susceptibility to sunlight and other
> unwanted radiation) and are very stable but a little slow to
trigger
> + they are fairly cheap trade.
>
> Pyronix Magnum Ultra - (existing PIR's in my house) - OKish
looking,
> seem quite stable and have selectable 1/2/3 pulse count making it
a
> bit quicker to trigger when on 1.
>
> Optex RX-40QZ - Recommended by Comfort but I've not tried this yet
-
> only 2/4 pulse count and detection area doesn't look very dense.
>
> I think the detection area density is also important. This is the
> pattern of 'detection beams' that spread out from the sensor and
how
> closely they are spaced. The lower the density, the further you
will
> have to move to trigger the sensor (depending on pulse count).
This
> is especially important if you want to detect occupancy in, say,
the
> living room where you may sit on a sofa for longish periods of
time.
> A high-density pattern and propper alignment of the PIR will help
> here although you cannot guarantee that the sensor will pick up
> small movements.
>
> Someone mentioned a dual tech sensor on here a while ago.
Generally
> these are no good as their trigger time is pretty poor (long).
They
> use a combination of IR detection and microwaves. This particular
> sensor gave separate outputs for both sensors, allowing the
> (quicker) microwave technology to be used on it's own. The
microwave
> bit can be difficult as it will apparently sense through walls
> (although I've not tried one) - so siteing is important. Anyone
use
> these - I'd love to hear if it's successful.
>
> Paul.
>
> --- In ukha_d@y..., "Amar Nagi" <amar@a...> wrote:
> >
> > I have homeseer, ocelot and I want to set up sensors around
my
> flat to
> > indicate when a room is occupied. What are my options ? I get a
bit
> > confused
> > by the range of different sensors (Pir)
> >
> > Any recommend anything ? I don't really want to go for the RF
x10
> route
> >
> > Ps sorry I used the wrong subject line b4.
>
>
>
> For more information: http://www.automatedhome.co.uk
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