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Can I block a PIR motion sensor’s view?

Yes. PIR is essentially line-of-Sight. In some cases it can see through glass. They can even sense the motion of hot air from HVAC vents. However bookshelves, walls, plants and similar inanimate objects will obstruct the “vision” of such devices. We have ultrasonic systems available for some of the applications where obstructed view is inevitable. Please refer to the link below for a look at our line of occupancy sensing systems.

http://www.cooperindustries.com/content/public/en/lighting/controls/brands/greengate/occupancy_sensors.html