Pet Immune Motion Detectors

By: Ari Erenthal, Published on Jan 09, 2017

Pet immune motion detectors allow arming an alarm even when pets are at home.

There are two types of pet immune motion detectors:

  • Pet tolerant motion detectors
  • Dual technology motion detectors

In this note, we examine how each types work, what the costs and options and the tradeoffs across the two.

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Comments (5)

Any tests planned for some motion detectors?

I have Honeywell pet tolerant PIRs at my house and 2 mid-to-large size cats. They're not very active though; occasionally they'll chase each other around the house, but not often. So far so good, haven't gotten any false alarms from the monitoring company.

Had a customer with a Doberman, a Dachshund and a cat that had the run of the home while the owners were away, and there was no way I would use any type if motion detector in that home. Instead, I installed recessed sensors on some interior doors in addition to the perimeter doors and windows.  Not much else could be done for interior detection and the homeowners are happy with this. Unless the pets can turn door knobs, there will be few false alarms.

I use/sell pet immune sensors.
You need to keep the animals away from the sensors. If they are able to go near the sensor they will cause a false alarm as the sensor will "think" they are a big object.

In outdoor environments the problem is even bigger as I had problems of insects landing on the sensor and no pet immunity avoids that.

The better the sensor less false alarm you'll get. So for outdoor we recommend dual tech sensors and sometime triple tech like the NVX80 of Paradox that is big, bulky and industrial but gets the job done.

The other thing to remember is that the vast majority of 'pet immune' sensors really just turn down the sensitivity of the sensor, especially those with only a single pyro. They also use other signal processing 'tricks' like signal duration rather than just amplitude, but at the end of the day the major change is the sensitivity.

There are a few exceptions that do things in a smarter way, something like the Takex 6612 which uses dual mirrors & the Crow Genius 10 which has 2 pyros & lens assemblies stacked on top of each other to give true 'layers' of detection.

UD2, I don't think that 'turning down the sensitivity' is an accurate characterization of how these PIRs work, at least, not anymore.

Most of the modern PIRs with which I am aware use movement profiles and crosshatched detection zones. The movement profiles in pet tolerant detectors allow for a specific number of vertical and horizontal zones to close without triggering an alarm. Those movement profiles are quite small and based on mass, not size. Outside of those movement profiles, however, you will find that the detectors are as hard to fool as a standard motion. For example, 

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