|GTO LoopDT1 Loop Detector - Loop DT 1 Vehicle Loop Detector. GTO PRO LOOP-DT1 Loop Detector Sensor. The compact GTO/PRO® designed single channel loop detector is ideal for any type of loop system. It can replace your other loop detectors and will work on any brand of gate operator. The detector’s low power consumption also makes this system perfect for solar applications. Ideal for: Hands free exit and entry applications, Vehicle detection applications, Replacement for existing loop detectors.