Problem with Visonic K9-80

[meir410@xxxxxxxxx]

Hello,

I purchased and installed the Visonic K9-80 based on recommendations
that I found in this forum. However, I am having problems with it in
that it appears to not go off when it should. I can often walk right
down the middle of the room right across it's field of view and it
will not go off. Other times it will. Once, I had a person and 2 dogs
walk in front of the detector and it didn't go off. I can not find any
pattern for when it detects me and when it does not. I believe the
coverage left to right is fine because when I'm higher up on the
stairs all the way to the side of the room it always picks me up. The
detector is mounted 8 feet off the ground (floor to bottom of
detector) in the corner of the room. The sensitivity is set to 2
(middle). I have the vertical adjustment set to 8 feet. The only thing
that comes to mind is that somehow the verticle adjustment is wrong
and it thinks that I am below 3 feet and is ignoring me. But I did
adjust the verticle adjustment as outlined in the manual. Any
suggestions or could this just be a dud?

Thanks!