Vehicle Ground Loop Detection Circuit

If the inductive loop is placed correctly it will detect vehicle open gate and keep it open until the vehicle clears the gate.

Vehicle ground loop detection circuit.

Best performance is obtained by shortening the leads as much as possible and providing the lowest impedance to ground. In other words the relay circuit output will be closed opened the entire time that a vehicle is present over the loop and does not switch again until the vehicle drives away. The common either the bolt green wire or center clip connection must be connected to earth ground. Find loop vehicle loop detector equipment here.

Most loop detectors have built in diagnostics which can identify problems in the detection system. How to make a vehicle ground loop detection sensor circuit duration. Good practice dictates multiple loops and detectors in this situation. The wire loops embedded in the ground act as the inductive mechanism for a high frequency oscillating circuit.

The presence of a car lowers the inductance of the loop embedded in the road which then alters the operating frequency of the circuit. The electronics unit applies alternating current electrical energy onto the wire loops at frequencies between 10 khz to 200 khz. Vehicle detection loops called inductive loop traffic detectors can detect vehicles passing or arriving at a certain point for instance approaching a traffic light or in motorway traffic. Loop vehicle detector.

If the resistance is less than 50 megohms the loop is shorted to ground and must be replaced. Leads to each loop. When a vehicle with metal parts approaches or stops within the wire loop the frequency of the oscillating circuit changes. If the resistance is less than 50 megaohms the loop is shorted to ground.

An insulated electrically conducting loop is installed in the pavement. This loop detector is responsive highly sensitive and utilises sophisticated software algorithms which adapt to prevent false triggering. One 140d130s250sg2n0 140d130s250sw3n0 is used on each loop detector circuit to be protected. In either case the loop or the extension cable must be replaced.

This project an induction loop vehicle detector from 1983 is really a large metal detector buried in the ground. Here s a step by step video on how to loop detector as open.