Re: PIR Options

["psghome2002" <psghome@xxxxxxx>]

The new PIR sounds interesting - I would imagine it's being designed 
to address the 'occupancy sensing' issue???

--- In ukha_d@y..., "Frank Mc Alinden" <armagh@b...>
wrote:
> 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 210 sensor and 220 these are now outdated i think the new ones are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@h...>
> To: <ukha_d@y...>
> 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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> >

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