See MOTION SENSORS.
Passive infrared. A motion detector that senses body heat to detect motion.
Passive Infrared. A sensor that uses Infrared energy to detect motion within the premises by detecting a change in temperature within its pattern of coverage.
Passive Infrared. Widely used in devices to detect motion. A special lens on the front of the PIR divides the sensor into zones. A individuals body heat radiation is detected as it moves through the sensor zones in front of the PIR
Passive Infra Red movment detector.
Passive Infrared, basically it is a heat sensor, not a motion sensor.
a device that uses Infra Red energy to detect motion within the premise
abb. passive infra-red
Stands for Passive Infrared. This technology is used in motion sensors to detect movement. The devices are passive because, unlike a TV remote, they do not generate any infrared light - they only detect it. Infrared light can be generated by heat, so motion sensors with PIR can detect the heat produced by people and warm-blooded animals.