If an object is moving in the sensor’s field, the returning microwave will be at a different frequency, higher or lower than the original signal transmitted. Microwave sensors are most effective in detecting objects moving toward the sensor rather than across its field of vision.

Microwave sensors are especially effective in harsh environments where heat sources cycle on and off, and where PIR technology might be prone to false alarms from heating vents, for example. The sensors are also commonly installed in large storage spaces like warehouses where the air flow is difficult to control. An advantage of microwave sensors are in its ability to penetrate walls which means these security sensors can be placed behind objects.

A drawback to using microwave sensors in a home security setting is their strong sensitivity, which makes them hard to set or adjust effectively, and makes them vulnerable to interference from other electrical devices such as lighting and radios.

Even with this drawback, some manufacturers have come out with sensors that are immune to elements most commonly found at home such as the 797520 Microwave motion sensors. With its built-in sensitivity to ANY size pets, it’s immune to false alarms caused by pets wandering around your home. Some units are even able to continuously adjust to room environment such as the 797573 60 X 70 Sq. Ft. Motion Sensor. It comes with adaptive technology and with this; it has improved microwave sensor’s reliability and reduce false alarms.

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