High Sensitivity Vehicle Loop Detector with ASB Function for Trucks Trailers and High Chassis Vehicles

The high sensitivity vehicle loop detector is designed for reliable vehicle detection in applications involving trucks, trailers, buses, semi-trailers, and other high chassis vehicles. By working with an inductive loop installed beneath the road surface, the detector identifies changes in loop inductance caused by metal vehicle bodies and provides stable relay signals for connected control equipment. It is suitable for locations where conventional vehicle detection may become less stable because of high ground clearance, uneven chassis structures, or varying vehicle sizes.

A key feature is the Automatic Sensitivity Boost, or ASB, function. Once a vehicle is initially detected, ASB automatically increases detection sensitivity to help maintain continuous vehicle presence recognition. This is particularly useful when long trucks or trailers pass over the induction loop, as the metal distribution underneath these vehicles may vary significantly from the front to the rear. Maintaining stable detection helps reduce the risk of signal loss while the vehicle is still occupying or crossing the loop area.

The detector also provides 16 selectable sensitivity levels, allowing installers to adjust detection performance according to loop dimensions, installation depth, electromagnetic conditions, and target vehicle types. Its wide 15–2000 μH inductance range supports different loop sizes, shapes, and numbers of turns, providing flexibility for various installation environments. Four selectable operating frequencies can be configured when multiple loops are installed nearby, helping reduce electromagnetic crosstalk between adjacent detection zones.

Flexible relay functions support vehicle presence monitoring, entry pulse, and exit pulse applications. Permanent presence mode can continuously maintain the output while a vehicle remains above the loop, making it suitable for applications where trucks may stop or move slowly for extended periods. Adjustable relay release delays also support smoother coordination with barriers, gates, cameras, and other control systems.

This high sensitivity vehicle loop detector is well suited for truck entrances, logistics parks, warehouses, industrial facilities, weighbridge systems, toll lanes, parking barriers, loading areas, and access control points serving mixed vehicle types. Its adjustable sensitivity, ASB function, wide inductance compatibility, and configurable relay control provide a practical solution for dependable detection of both standard vehicles and challenging high chassis vehicles.