Tue Dec 12, 2017
Passive Infrared (PIR) senses occupants by sensing the difference between the heat emitted by moving objects and background, determining occupancy. PIR is great for areas in need of strict sensor coverage such as between warehouse aisles but requires a direct line of sight to operate.
Ultrasonic sensors use sound to measure changes in the environment by the difference in time between sensor pings and the speed in which the sound returns. Ultrasonic does not require a direct line of sight and can detect minor movements such as hand gestures. However, they cannot have their angles adjusted and often have trouble operating in large rooms or locations with high vibration.
Combining the best of both PIR and Ultrasonic technologies, sensors such as the VDMDC50V, and the low-voltage VDMDC50L, virtually eliminate false ons/offs and cover up to a 1600 square foot of PIR and 1000 square feet of Ultrasonic. Both feature 5 seconds to 30-minute time delays and 3-minute walk-through triggers after 30 seconds of no activity.
For wall mounted applications, the VCDOSW-WH also uses the best of both technologies. This wall switch covers up to 1200 square feet in PIR coverage and 400 square feet in Ultrasonic coverage. Featuring a 15 second to 30-minute time delay adjustment, the occupancy sensor can still function as a traditional switch with the manual or automatic on/off switch.
To learn more about Dual-Technology Occupancy Sensors from RPP, click the button below or visit your local City Electric Supply.