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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 from each other and set crosswise to the direction of the 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 reinforcement: plus 2 windings
Installing the induction loop
To lay the loop underground, realize channels in the ground as shown in fig. 1 and
fig. 2. 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. 3).
If the loop is to be laid under concrete slabs, run the loop cable in a bed of sand.
Start laying the loop cable at the detector electronics. In case of concrete slabs or steel
reinforcement (function cannot be guaranteed), 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. 4) should be twisted,
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. 5).
If the loop functions without fault, the channel should be filled in with a suitable
bitumen or epoxy resin based concrete mix.
