Re: Re: Occupancy detection

["Simon Coates" <ecolume@xxxxxxx>]

Replied offlist

----- Original Message -----
From: Stephen <yahoo@stephenorme.freeserve.co.uk>
To: <ukha_d@yahoogroups.com>
Sent: 25 January 2004 22:04
Subject: Re: [ukha_d] Re: Occupancy detection


> On Sun, 25 Jan 2004 18:16:07 -0000, you wrote:
>
> >A 'traditional' PIR is the type used for security purposes and is
designed
> >to minimise false alarms - ie. by having pulse counting etc...
> >An occupancy sensor is much more sensitive as it is designed to
detect
> >slight movements of a person in a room.  For example, sitting at a
desk
or
> >sat on a sofa watching TV etc...
>
> Thanks, I am familiar with traditional PIRS; I just hadn't heard of
> the occupancy type before.
>
> >The occupancy detectors I've supplied to people on the group in
the past
are
> >recessed ceiling mounted detectors.  They require a 12V DC supply
1mA
(not
> >including load) and have an open collector output rated at 40V max
25mA -
> >and can be directly connected to HomeVision, Comfort etc.. The
coverage
is
> >360 degrees and the detection pattern is 3 concentric 'rings' - 14
> >concentrated zones in the centre, 24 zones from about 1m to 2m
then 24
zones
> >from 2m to 3m radius (when mounted at normal ceiling heights).
>
> The 360 degree range sound ideal. The ubiquitous 12v supply! 1mA not
> including load. If it is open collector, surely there is no load?
>
> >However I have some of the original PIRs if you are interested.
>
> Sorry to hear about your bad luck. How many of these do you have left,
> and what is your asking price? I would like to try one and if
> successful, which I am sure they will be, take more off your hands.
>
> Thanks.
>
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