Re: A scope for installing PIR?

["R.H.Campbell" <rh.campbell@xxxxxxxxxxxxx>]

Sir, there is no such device to my knowledge. Far more likely this is simply
a poorly worded statement that is trying to tell you go around the room and
make note of obstructions that would prevent the device from fully "seeing"
the room or area you are trying to cover.

Ideally, locate the motion on an interior wall that is also looking inwards
and away from heating vents, and streaming sunlight coming in from windows.
Follow the manufacturers recommendations to the letter, and it might also be
wise to set the device to the least sensitive setting, assuming your device
will allow for. You generally don't want motions set too sensitively, since
the poor ones anyway, can false alarm due to certain environmental
situations.

Think of a motion like a glass of water, full completely, with the meniscus
in a positive mode. If you literally breathe on the motion, it will spill
water (ie: alarm). With the better motions,or motions set to a less
sensitive setting, think of them as that same glass of water, but with the
meniscus in a negative mode. They will handle a little nudge without
spilling water (ie: tripping the alarm). However, any real presence of a
warm body is like smashing the glass with a hammer....

R.H.Campbell
Home Security Metal Products
Ottawa, Ontario, Canada
www.homemetal.com

"John O" <johno@#no^spam&heathkit.com> wrote in message
news:xQw6e.429$bc2.313@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>I need some help from you pros. I'm staring at an assessment question that
>says something like this: "when installing a motion sensor in an odd-shaped
>room, scope the perimeter and eliminate obstructions."
>
> I'm assuming there is a device that I would look through that gives me
> some idea of what the PIR would see. But I can't sniff out anything on the
> web to clarify this. I've given this a good try, and far too much time,
> but I can't find a link to such a device. Does anyone know where I'd find
> one?
>
> -John O
>