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Installation guide
Crosstalk
When two loops con guration are in close proximity, the magnetic elds of one overlap and disturb the eld of the other. This phenome-
non, known as crosstalk, can cause false detection and detector lock up .
It could eliminated by
1) Careful choise of operating frequency with "dip-switch" # 1
2) A minimum spacing of 2 between loops should be adhered loops.
3) Careful screening of feeder cables. If they are routed together woth other electric cables, the end of feeder connected to the detector
must be earthed.
Metal reinforcer
The existance of metal reinforcer such as steel below the road surface could a ect the changes of the loop inductance. Hence where
reinfoncer exist 2 turns shluld be added to normal loop.
Feeder refers to the cable connecting loop and detector. The feedershould be interwisted at least 10 - 12 times per meter. It should be
noticed that sensitivity decreases with increasing feeder length.
Loop and feeder speci cations
1. The loop and feeder should constitute a single un - joined length of insulated multi - strand cooper conductor, woth a minimum of 1.5
square millimeter cross sectional area.
2. Joints in the loop or feeder are not recommended.
Where this is not possible, joints are to be sldered and tereminated in a waterproof junction box.
3. The loop length will be determined by the width of the roadway to be monitored. In general, loops with circunference in excess of 10
meters should be installed using two turns of wire, while loops less than 10 meters circumference should have three turns or more. Loops
with circumference of less than 6 meters should be have four turns.
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