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

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

And me

Alancc
----- Original Message -----
From: Mick Furlong <dorsai@xxxxxxx>
To: <ukha_d@xxxxxxx>
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@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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