Loop detectors are used in conjunction with vehicle detection loops to detect vehicular traffic traveling or stopping overhead in a roadway these are commonly used to trigger traffic lights and you have undoubtedly traveled over thousands of them without even realizing it.
Vehicle detection loop detector wiring diagram.
The proper installation and material is critical.
Inductance loops are available as direct burial or cut in.
A buried coil of wire loop in the roadway vehicle detector electronic module.
It is shipped with a underwriters laboratories approved class 2 plug in the wall 12 vdc power adapter.
Be sure that other loop wire is floating not connected.
The wire gauge is not critical to proper operation of the loop detector.
The marsh loop vehicle detector can be powered by either a 9 20vdc or 9 16vac.
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The wire should maintain its integrity under the pavement stress.
Use a multi meter to measure the resistance from one loop wire to ground stick long nail in dirt if operator does not have ground.
Since asphalt is more flexible than concrete it is recommended that a heavier gauge wire be used for loop installations in asphalt.
This video just want to show our traffic vehicle detector function and the loop inductive can be identification if you want to use it for traffic control app.
To check leakage disconnect loop from detector.
The incorrect type of wire will also leak to ground.
In general direct burial loops are placed below the surface prior to application of asphalt or concrete while cut in loops are installed within a slot sawed into.
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However the power can be supplied by any external device and connected via the screw terminals provided inside the enclosure.
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Vehicle loops and loop detectors are used to detect the presence of a vehicle to open a gate or as a safety device to prevent the gate from closing on a vehicle in its path.
Basics of vehicle detection loops.
An insulated electrically conducting loop is installed in the pavement.
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 wire insulation and sealant.
Vehicle detection if no response should be an increased sensitivity to stall so repeated several times until the car seized stability for normal work.
