Alarm Motion
2010
My Security system has a recurring false alarm from the wired motion detectors. What might be causing it?
Have Outdoor PIR ones now installed, should I replace them with microwaves?
If you refer to a PIR lamp as a security system outside your house than there is not much you can do. They do not respond on insects, but a bird or bat will trigger them easily. Do not change them with microwave detectors as they are a lot more sensitive and will give alarm at any moving object (leafs on tree, spider etc).
What you could do is limit the sight of the sensor by covering the lens with duct-tape allowing you to specify the required area.
If it would have been a PIR sensor for an alarm system inside your home and the false alarm happened from one day onto another I would measure the NC (normally closed wire = alarm output in sensor) and the tamper wire (should be normally closed)
Good luck, I hope this helped you in the right direction.
Sebastiaan
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