The in-ground loop system is essentially a giant metal detector which senses the presence of vehicles in the path of an automatic gate, preventing it from closing.
The loop detector is the electronic component that controls the loop system. DoorKing offers two loop
detectors (a single channel and two channel) that plug directly into the control board of the Doorking gate operator, eliminating the
wire harness and wiring connections other than the loop lead-in wires. These detector boards have a
terminal strip where the loop lead-in wire connects.