Re: Are PIR's always this sensitive?

[Crash Gordon® <webmaster@xxxxxxxxxxxxxxxxxxxxx>]

Cheap is very dear.

Inexpensive, battery powered, exterior, sunlight, heat, wind, moving =
trees, blowing leaves, dust, birds, cats - what more can you ask for?

There's a reason reliable exterior motion detectors are expensive - and =
even they will false occasionally.

Depending on your layout, maybe you can go to a small dual beam point to =
point detector where the visitor must pass through the dual beams.


"Beachcomber" <not_real@xxxxxxx> wrote in message =
news:4291f2c0.5021171@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
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> I installed an inexpensive, battery powered X10 PIR outside my front
> door, initially thinking that if I kept it out of direct sunlight, it
> would function reliably.
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> The problem was that it was super-sensitive and would trip as cars
> drove by on the street 100 ft away, and often for no reason at all.
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> So I relocated the unit to face down from the entry overhang.   The
> false alarms were reduced but not eliminated.   I would get a trip
> about once or twice a day at totally random times.  =20
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> Question - Is it typical for a single PIR unit to spontaneously trip
> like that?   Is that why they have dual PIR units?
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> What would be a reliable outoor model that could pre-anounce visitors
> without false tripping?  It does not have to be tied into the main
> alarm system.
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> Beachcomber
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>