PIR - triggers alarm without cause

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May 25, 2010
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Anyone able to explain why a PIR would trigger for no reason?  Few times now in the last month or so the PIR in my listening space (completely isolated from rest of house and only a single entrance, which is never used/disturbed unless going to listen to music) would trigger the alarm and on inspection there's nothing going on, no insects, cobwebs etc. in the area.  PIR is dust free and staring back towards the entrance to the room.

Toss it for a replacement?

 

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