http://www.bircheramerica.com/industrial-door/sensing-edges.htm

Safety edges

Loop Detectors Loop Detector Systems are used for indicating the presence or passage of vehicles. A system consists of an inductive loop and a detector module such as the LD series from Bircher Reglomat. Applications include traffic signal control, access control in car parks and vehicle counting.

A Canadian Overhead Door Company Servicing all Ontario Canada

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Accurate Overhead Limited