Presence and absence detection explained The choice between presence and absence detection for different spaces can make a big difference in user-friendliness and the amount of energy saved. PIRs and microwave detectors compared
PIR detectors PIR (Passive Infrared) presence detectors detect body heat and movement and are ideally suited where a defined detection pattern is required.
Microwave detectors Microwave presence detectors are sensitive to movement and are ideal for large spaces and areas that have an awkward shape or where fine motion detection is required. Ideal for Toilets as they see through cubicle doors.
Note Microwave will see through Thin walls
