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The built in PIR has a 120º detection angle with a range of up to 4 metres. As the unit is ceiling mounted it is ideally designed to be placed in a ceiling tile near an entrance way to detect customers or other visitors entering a room or area.

 

It works by measuring the Infra Red (IR) light radiating from an object such as a human being in its field of view and detecting the subsequent radiant heat emitted. Please see our TIP 789 here for more information on how to get the most from your Passive Infra Red (PIR) detector installation.