Vehicle Detectors are an extremely reliable means to detect vehicles and prevent the gate from closing on a vehicle. The system consist of two components, the vehicle detector and the buried loop. The vehicle detector is an electronic device that mounts in the operator. The vehicle detector provides a staple magnetic field to the buried loop and senses changes or fluctuations in the magnetic field when a vehicle is present.

Vehicle detectors can be configured to open gate, prevent a gate from closing, and reverse a gate during the close cycle to the open position. A vehicle detector should not be used to close a gate. Free Exit vehicle detectors' loops are installed on the secured side All a gate and will open the gate as well as reverse it during the close cycle. Vehicle detectors "To Hold" will prevent a gate from closing but will not open the gate. This configuration is installed on the the public side of the gate. Swing gate because of the sweeping action of the gate panels may have a "Shadow Loop" which is placed under the gate and only active when the gate is in the full open post ion.

The loop is a continuous length of wire imbedded in the driveway in a rectangular shape. The dimension of the loop is determined by the width of the driveway. The loop can be a manufactured preformed loop placed in the bed of the driveway prior to the concrete or asphalt being installed. It may be a preformed loop placed in existing asphalt or concrete that is saw cut to accept the loop. Or it may be a loop fabricated from a special wire with a specific size and number of turns calculated for a specific application. All loops are either saw cut into or installed prior to the driveway be poured. Loop sealant is available to match asphalt or concrete driveways.

The layout of loops is critical and requires experience. Loops should be placed in the driveway so a vehicle is never in the path of the gate without being over at least one loop. Since a vehicle detector can recognize metal it the loop cannot be placed to close to the gate. To increase area of coverage multiple loops can be wired in series or parallel to a single vehicle detector.

To avoid phantom operation loops should only be installed in driveways in good repair and never in gravel drives without consulting Tri-Cor. The driveway cannot have concrete or asphalt. The roadbed must not have depressions from vehicle wheels. The loop must be buried at least 1 1/2 inches below the top of the driveway. Loops can be installed in driveways that have rebar. But not over sewer lines or electrical wires.

Contact Tri-Cor for assistance for loop design.

Vehicle Detectors
		Vehicle detectors that are proprietary to specific manufactures of gate operators are listed under that specific gate operator manufacturer.
		Manufacture: Reno | Model: AEX | PDF Literature Part No: Vehicle detectors are wired to gate operators using a harness or 11 pin socket. A separate vehicle detector is required for a "Free Exit" or a "Hold Open" application.
		Tri-Cor Loop Wire Kit Part No: Tri-Cor Loop Wire Kit provides the special loop wire and commercial grade loop sealant for a single loop. The sealant is available in asphalt black or concrete gray.
		Manufacture: B&D | Model: Preformed Loops| PDF Literature Part No: Consult Tri-Cor 1.800.249.0674 for proper size Preformed loops provide the most sensitive and reliable loops for vehicle detectors. Preformed loops are available in various sizes to assure proper coverage of virtually any driveway. Select loop sealant below.
		Manufacture: TCI | Model: Asphalt Loop Sealant | PDF Literature Part No: Commercial grade loop sealant in convenient tube dispenser for asphalt driveways.
		Manufacture: TCI | Model: Concrete Loop Sealent | PDF Literature Part No: Commercial grade loop sealent in convenient tube dispenser for concrete driveways.
		6/8/07