What Is a Pet Immune Motion Sensor?

A pet-immune motion sensor is a motion detecting sensor that is designed to detect humans walking upright, while ignoring small animals that are walking close to the ground. Mounting height and positioning is extremely important for a pet immune motion detecting sensor to work correctly.

Honeywell 5800pir res wireless pet immune motion detector close up

The purpose of a pet immune motion sensor is to allow small animals or pets to move around a building freely without causing a false alarm. At the same time, the motion sensor will still detect humans moving throughout the same area. In other words, the motion sensor will still alert the system to an intruder who breaks into the building. You are basically getting the best of both worlds. Your dog or cat can move around and play while you are gone, but your system will still go into an alarm if someone breaks-in and walks past your motion sensor.

Of course, this isn't that simple. A motion sensor isn't smart enough to determine whether the movement is caused by your pet or by a dangerous criminal. To solve this issue, a pet immune motion sensor will have two (2) separate detection patterns. There will be a lower pattern that will look close to the ground where a small animal would move. There will also be an upper pattern that looks where a human would be walking upright. A pet-immune motion sensor will only activate if both detection patterns are triggered.

This can be seen in the following picture:


Most pet immune motion sensor will offer pet immunity for small animals up to a certain weight. If a pet immune motion sensor says that it provides pet immunity of "up to 40 pounds", then that means a small animal weighing more than 40 pounds will probably activate the sensor. But remember that these listed weights are just estimates. The real consideration is whether or not the small animal will get within the sensor's field of view.

It is important to understand that pet-immune motion sensors are not perfect. If a pet manages to get up in the upper detection area, it will still trigger the motion sensor. For example, if you have your motion sensor facing a couch, and your pet climbs on top of it, they might still activate the sensor. You must choose the location of your pet immune motion sensor very carefully. You should also mount it from a proper height. Mounting it too low may allow your pet to get within its detection area. The standard mounting height for a pet immune motion detector is between 7.5 feet and 8 feet high. Finally, you should use the lowest detection sensitivity possible for a pet immune motion sensor.

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