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1. Installation Instructions
Geometry of the induction loop
Lay the induction loops in the shape of a rectangle. The longer sides should be approx.
1 m apart and set at a diagonal to the direction of traffic. Maintain a minimum
distance of 1 m from the door and a minimum distance of 0.3 m from the edge of the
road surface.
The number of windings depends on the size of the loop:
Loop larger than 10 m: 2 windings
Loop smaller than 10 m: 3 windings
Loop smaller than 6 m: 4 windings
Concrete slabs and steel reinforcements: plus 2 windings
Installing the induction loop
To lay the loop underground, make a channel in the ground as shown in fig. 1.
Set the corners at an angle of 45° in order to relieve the strain on the loop cable.
Geometry of the channel: approx. 6 mm wide, approx. 30-50 mm deep (fig. 2).
If the loop is to be laid under concrete slabs, run the loop cable in a bed of sand.
Lay the loop cable starting at the detector electronics. In the case of concrete slabs and
steel reinforcements, ensure that two additional windings are incorporated into the
induction loop.
After laying the windings, feed the loop cable back through the channel connecting
the loop with the detector electronics.
As from the end of the loop the two connecting cables (see fig. 3) should be
intertwisted, incorporating at least 20 twists per metre.
It is important to run an operational check on the loop before setting in concrete.
Connect the induction loop detector to the corresponding control unit in accordance
with the provided wiring diagram (fig. 4).
If the loop functions without fault, the channel should be filled in with a suitable
bitumen or epoxy resin based concrete mix.
