Re: Re: PIR types - who knows the difference between lighting optimised PIRs and security optimised PIRs?

["Alancc" <alan.cc@xxxxxxx>]

Can't find the RS one but Craplins have a 4.5v to 13.5v one, its just under
a tenner but would connect directly to HV.

Alancc
----- Original Message -----
From: <patrickl@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, November 27, 2001 9:18 PM
Subject: [ukha_d] Re: PIR types - who knows the difference between lighting
optimised PIRs and security optimised PIRs?


> If you want to do occupancy detection with HV or Comfort, you can
> actually buy just the sensor bit on it's own from Radio Spares or
> similar. They cost about 4 quid, and are very compact - about the
> diameter of a large button. Without the fresnel lens normally
> supplied as part of a fully built sensor, they are hyper-sensitive to
> movement. The only minor downside is the requirement for a 5V supply.
>
> Patrick
>
> --- In ukha_d@y..., "Alancc" <alan.cc@n...> wrote:
> > And me
> >
> > Alancc
> > ----- Original Message -----
> > From: Mick Furlong <dorsai@d...>
> > To: <ukha_d@y...>
> > Sent: Tuesday, November 27, 2001 8:34 PM
> > 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@y...
> > > > 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@i...>
> > > > To: <ukha_d@y...>
> > > > 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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