Pet immune motion detectors are required to be installed in house where pet is living. The pet immunity motion detector can identify moving of pet and human. So, it can avoid false alarm caused by pet movement.
Security systems manufacturers are adopting new digital technology to make pet immune motion detectors.
Generally, there are 2 ways of pet immunity technology. One way is changing design of Fresnel lens. The fresnel lens will refract or reflect Pyroelectric infrared signal to PIR. It will divide the detection area into a number of bright and dark regions. Changing the area division way can reduce the false alarm caused by small pet. But the effective is minimal.
Another way to reduce false alarm caused by pet is MCU processing. The MCU will collect the detected infrared signal. Then it compares that with sample signal of human movement. It analyzes the signal cycle, volumn, polarity. If the detected frequency range is 6-12Hz, the system judges an activity as a pet activity and does not generate an alarm. If the detected frequency range is 0-5Hz, the system generates an alarm.
There are maximum 15kgs, 20kgs, 35kgs pet immune motion detectors. Home owners should select the corresponding one to fit the pet weight.
Correctly installing the motion detector is important to reduce false alarm. There are installation note for pet immune motion detectors. It is required to install the detector according to the manual.
There are 4 notes when install the motion detectors.
1. Installing height
Install the motion sensor at required installing height. Otherwise, the detection distance may be shorten. The pet immunity effectiveness will be decreased.
2. Installing angle
3. Installing place
PIR motion detector should be avoid installing at some places where interference may be generated.
4. Installing direction
It is best to keep potential intrusion direction and detection area of PIR as 90 degree.
Digital technology is developing. So, in the future, the motion detector will be more intelligent and easy to use.

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