Some detectors are designed to use analysis to “see” the body dimensions of people and differentiate from backgrounds and...
Infrared energy is measured in microns, with the human body producing energy in the region of 7-14...
When the person to background contrast smaller – the output pulses from the PIR element will become smaller. Most PIR detectors will suffer a decrease in the coverage pattern as a result. Some detectors compensates at ambient temperatures below body temperature....
When background or ambient temperature approaches that of a human being (approximately 88F), the lack of contrast can make detection...
Introduced to reduce false alarms Second Threshold set based on research on walk tests Signals processed at slower rate between 1st & 2nd thresholds Signals processed at normal rate above 2nd...