PIR Motion Sensors

Fundamental Element of an Alarm System. PIR (Passive Infrared) motion sensors are the most popular and fundamental devices for intruder detection in alarm systems. Their operation is based on detecting infrared radiation (heat) emitted by moving objects, such as humans. How Do PIR Detectors Work? A passive infrared sensor analyzes the ambient temperature in its field of view. When an object with a temperature higher than the background appears in the detection area j