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.
Vehicle detection loop detector wiring diagram.
3 wiring diagram pin designation 1 live 230v ac 50 60 hz 2 neutral 3 pulse relay normally open contact 4 pulse relay common contact 5 presence normally open contact 6 presence relay common contact.
In general loop vehicle detectors from all manufacturers work under the same principle and will all work reliably if the installation is done.
Loop wire insulation and sealant.
To check leakage disconnect loop from detector.
The incorrect type of wire will also leak to ground.
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An insulated electrically conducting loop is installed in the pavement.
A buried coil of wire loop in the roadway vehicle detector electronic module.
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.
The marsh loop vehicle detector can be powered by either a 9 20vdc or 9 16vac.
However the power can be supplied by any external device and connected via the screw terminals provided inside the enclosure.
Basics of vehicle detection loops.
It is shipped with a underwriters laboratories approved class 2 plug in the wall 12 vdc power adapter.
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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.
Inductance loops are available as direct burial or cut in.
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.
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Vehicle detection if no response should be an increased sensitivity to stall so repeated several times until the car seized stability for normal work.
Since asphalt is more flexible than concrete it is recommended that a heavier gauge wire be used for loop installations in asphalt.
Be sure that other loop wire is floating not connected.
The electronics unit applies alternating current electrical energy onto the wire loops at frequencies between 10 khz to 200 khz.
The wire gauge is not critical to proper operation of the loop detector.
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.
