Mick, Alan, Patrick ....
The PIRs are normally sold with a control unit for
switching
lighting off (and on) in commercial buildings, but I can supply them
separately. The PIRs trigger a pre-set timer - when this 'times-out'
the
lighting is switched off. The PIRs are designed to be fitted in
offices
etc... placed over desk areas, and to trigger with slight movement.
The
detection pattern is basically made up of 3 concentric 'rings' - 14
concentrated zones in the centre, 24 zones from about 1m to 2m then 24
zones
>from
zones. They are simply a sensitive ceiling mounted PIR.
They are £29.50 + VAT each, but the pyro sensor
used
is expensive. They come with 2 core screened cable attached (approx..
1.0m) - the screen is used as the ground wire with the other 2 cores being
12V
and open collector output. I'm going to test them
with HomeVision's
Port B inputs. Since the inputs are connected to 5V via a 2.7 ohm
resistor the PIR 'output' should be able to pull this down to ground
I'm
going to test them over the weekend. Phil Harris is testing one with
HV
at the moment (?) so he might have the answer soon.
I intend to use mine to control heating and
lighting. I've wired for DS18S20s in each room and each radiator/UFH
has
a separate zone valve. My schedule will have different setback
temperatures depending on whether:
the whole house is vacant (ie. Comfort is set) -
16°C
whether the house is occupied (ie. Comfort is in Day mode)
- 20°C
and whether a particular room is occupied (ie. PIR
triggered in that room) - 22°C
I also intend to have lighting switch on to various
scenes depending on occupancy and time of day - eg. Bathroom lights after
12.30pm could switch on at 10% etc...
Although occupancy PIRs aren't meant to be used for
security
applications I've been thinking of using them in certain upstairs rooms
which
don't have and security sensors back. For example, if an occupancy
PIR
was repeatedly triggered over a certain time (ie. an intruder) then HV
could
tell Comfort. But I'd have to test it because the PIRs could be
triggered by a spider or fly.
Simon
Ecolume Lighting Ltd
Bradford
----- Original Message -----
Sent: 27 November 2001 20:34
Subject: RE: [ukha_d] PIR types - who knows the
difference
between lighting optimised PIRs and security optimised PIRs?
> Simon
>
> I would be
interested
in details on these as well if you don't mind sending
> me
them:)
>
> Ta
> Mick
>
>
>
>
> > -----Original Message-----
> > From: Simon Coates
[mailto:ecolume@xxxxxxx]
>
> Sent: 27 November 2001 20:15
> > To: ukha_d@xxxxxxx
> >
Subject: Re: [ukha_d] PIR types - who knows the difference between
>
> lighting optimised PIRs and security optimised PIRs?
>
>
>
>
> > Chris,
> >
> > I'm using separate PIR
detectors - ceiling mount occupancy PIRs and corner
> > mounted
security PIRs. The occupancy PIRs couldn't be used for
security
>
> because they are too sensitive and would trigger a false alarm.
Security
> > PIRs have pulse count etc... and circuitry to account
for things like
> > background heat, sunlight to minimise false
alarms. There are even quad
> > pyro detectors where all 4
pyros have to be triggered for the PIR
> > to switch.
> >
Basically alarm type PIRs aren't any good for occupancy detection
and
>
> vice-versa.
> >
> > Best thing to do is keep your
security system separate from your
> > HA sensors.
>
>
> > The occupancy PIRs I'm going to use in my house are
very
> > sensitive and will
> > trigger with slight
movement. Certain, larger rooms will require 2
> > detectors
to
cover the whole area. I'll send you some info on them.
>
>
> >
> > Simon
> >
> >
> >
----- Original Message -----
> > From: Chris Langridge <chrisl@xxxxxxx>
> > To:
<ukha_d@xxxxxxx>
>
> Sent: 27 November 2001 18:40
> > Subject: [ukha_d] PIR types
-
who knows the difference between lighting
> > optimised PIRs and
security optimised PIRs?
> >
> >
> > > I'm
doing
some research about PIR's. Have been talking to
> > Philips who do
a
> > > very nice range of flush mount devices. Then I
discovered
(as
> > usual) that
> > > there's a whole bunch of
stuff
I'm not clear about.
> > >
> > > According to
Philips
the PIRs built for lighting control are more
> > sensitive
>
> > than those used for security. The reason of course, is false
alarms,
and
> > the
> > > fact that people wathcing the telly
don't move as much as bandits.
> > >
> > > If this
deifference in sensitivity is the case, what are you
> > guys
using
to
> > > control lighting AND security?
> >
>
>
> > Also: The Philips 12 volt units have an inbuilt timer. They need
three
> > wires
> > > (live, neutral and switch). They
are normally open, and close when
> > movement
> > >
is
detected. Depending on how the timer has been set, the contact will
>
> stay
> > > closed for say 5-30 minutes. Now I thought most
PIR's purely provide a
> > > signal which the HA controller
will
use according to it's own
> > logic. I had
> > > never
thought that a contact would be closed for say ten
> > minutes and
then
> > > released. Have I missed something critical here? Can
Comfort or
> > HV handle
> > > this kind of input, and
what kind of processes are you guys using to
> > control
>
>
> lighting if using standard (is there such a thing!) PIRs.
> >
>
> > > Sorry if this is all very basic - I'm just getting
upto
speed
> > on 'sensors'
> > > and have not even
purchase
my HA interface yet.
> > >
> > > Thanks
>
>
>
> > > Chris
> > >
> > >
>
>
> For more information: http://www.automatedhome.co.uk
>
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> > >
> > >
> >
>
>
> >
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>
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