A motion sensor is one of the most useful parts of an alarm system, and one of the most common causes of false alarms in homes with pets. The fix is not to skip motion detection. It is to understand how pet-immune sensors work, choose one rated for your animals and place it carefully. This guide explains how. How pet-immune motion sensors work Most motion sensors are passive infrared (PIR) detectors that react to body heat moving across their field of view. Alarm Grid explains that a pet-immune sensor only "looks" at the zones where a person would walk upright, not at the area close to the floor where a pet moves. Some models are dual technology, combining PIR with a microwave sensor so that both must see the movement pattern before the alarm triggers. Manufacturers rate these sensors by animal weight, but weight is only a guideline for choosing a model. Published limits vary a lot: one ELK wireless sensor is listed up to 40 pounds, Ritter describes pets under 80 pounds, ...
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