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Re: PIR Options



Actually Paul my thoughts were maybe it has daul contacts ,one for ha
control and one for alarm control . Summer time is a good test for a  pir .
Go into a room when the ambient temp is around 30 or more degrees C most
cheap ones you can walk up and just about kiss them before they will detect
you . I  think the dual tech sensor would be more sluggish as it would
require both pir + microwave to trip before alarming .

Frank Mc
----- Original Message -----
From: "psghome2002" <psghome@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Thursday, July 18, 2002 9:00 PM
Subject: Re: [ukha_d]PIR Options


> 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 210 sensor and 220 these are now outdated i think the new ones are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
> > > Post message: ukha_d@xxxxxxx > > > Subscribe:  ukha_d-subscribe@xxxxxxx > > > Unsubscribe:  ukha_d-unsubscribe@xxxxxxx > > > List owner:  ukha_d-owner@xxxxxxx > > >
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> > >
> > >
>
>
>
> For more information: http://www.automatedhome.co.uk
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>
>


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