Inductive Loop Vehicle Detector Dual Loop Detector For Sale
Inductive Loop Vehicle Detector
Inductive Loop Vehicle Detector Inductive Loop Vehicle Detector of the white shell Dual Loop Detector for sale
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1.The inductive loop
The inductive loop is simply a coil of insulated copper wire (building wire) that is routed in the road if the vehicle passes directly over it. Coils are usually used with multiple turns, and the ends of the coil are usually left long enough to reach the position of the vehicle loop detector module without connecting the cable.
In the existing pavement that needs to be installed, the loop line usually installs the loop coil by cutting a narrow groove on the road surface with a concrete cutter, winding the loop conductor into the groove and filling the groove with asphalt or epoxy to exclude the groove. Any water and prevent any moving conductors. In new roads, the coils can be constructed of PVC pipes and buried in wet concrete during casting.
The characteristics of the inductive loop determine the effectiveness (sensitivity) of the loop in detecting the passage of vehicles above it. These characteristics relate to the size, shape, and number of turns of wire and are detailed below.
2. The Vehicle Loop Detector
The vehicle loop detector is a low-cost electronic module in a small enclosure complete with electrical connections for inputs and outputs. The detector needs to be housed in a protective enclosure. This unit is powered with either mains voltage or low voltage ac/dc power depending on model type.
The vehicle loop detector provides visual indicators for power and output relay status. A number of switch settings optimize the performance of the detector to site conditions.
The detector electronics energizes the inductive loop with an ac signal that causes a magnetic field around the loop conductors. Changes in this magnetic field due to the passage of a vehicle are processed by the electronics to provide vehicle detection.
The control outputs from the detector are via output relays providing either normally open or closed relay contacts.
Refer to the vehicle loop detector User Guide for more details.
3. Sensing Loop Geometry
Sensing loops should unless site conditions prohibit, be rectangular in shape and should normally be installed with the longest sides at the right angle to the direction of traffic movement. These sides should ideally be 1-2 meters apart. Note that small loops restrict the available detection height, causing problems when detecting high bed vehicles and some SUV’s
Inductive Loop Vehicle Detector The length of the loop will be determined by the width of the roadway to be monitored. The loop should reach to within 300mm of each edge of the roadway.
In general, loops having a circumference measurement in excess of 10 meters should be installed using two turns of wire, while loops of less than 10 meters in circumference, should have three turns or more. Loops having a circumference measurement less than 6 meters should have four turns. It is good practice at the time of installation to construct adjacent loops with alternate three and four turn windings.
If the loop installation is in a concrete see Item installation manual before deciding on the number of loop turns.