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

["Mick Furlong" <dorsai@xxxxxxx>]

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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