motion detectors wear out?

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  #1  
Old 06-16-06, 05:10 AM
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motion detectors wear out?

We have a 20 year old hardwired system in the home.
I replaced the main guts with the GE Concord (good stuff) and reused all the sensors. THe hallway sensor (Napco name on it) appears to still work but not very well. It detects someone most of the time but not always. Do these sensors wear out over time?
I tried cleaning the plastic cover with some glass cleaner with no improvement. We have a 27 lb sheltie that roams the house and we need to take that into account. The hallway is rather short into another walk area, maybe 15 feet total.

Mr Bill
 
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Old 06-16-06, 03:39 PM
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Yes, electronic devices are not immune to the laws of thermodynamics (entropy always increases). If nothing else, the relay that actually trips the alarm input _will_ eventually fail (the teeny spring that does the work has only so many cycles in it).

There are a large number of motion detectors that are designed to be "pet immune" if properly mounted and aimed. Stick with the major brands like Sentrol, Optex, Visonic, Bosch, and the like.

Also, the zone type for a motion detector zone can be set so that the device bypasses automatically if you arm in "stay" mode.
 
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Old 06-16-06, 04:08 PM
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Another thing you probably already know is that some sensors rely on lateral movement to detect motion. Movement directly to or away from the sensor may not trip it. Properly aimed motion detectors are a must.
 
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Old 06-17-06, 03:34 AM
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I did not know about the lateral movement issue.
I know very little about sensors, other than there are more than 1 kind.

Thanks for the candid replies .

Mr Bill
 
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Old 07-04-06, 09:12 AM
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Installed an Optex RX-40PI sensor today.
Much more sensitive than the old one.
Big improvement.

Mr Bill
 
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