CARLO GAVAZZI LDD1 Manual De Instrucciones página 18

7. Loop installation
A proper installation of the loop in the road, is the single most important factor for achieving a reliable
detector system. Most detection issues are caused by improper loop installation. Please read the
guidelines below carefully to ensure best possible performance in the application.
7.1. Dimension and placement of the loop
The first thing to consider when installing a new loop is the dimension and placement. The dimension of
the loop is dependent on the road size and is normally rectangular in shape with chamfered corners.
The loop should be placed with approximately 30 cm (1 foot) distance to the edge of the road and
other road lanes. This helps to prevent false detections caused by traffic passing in adjacent traffic
lanes.
L11 L12 E1
R21 R22 R23
4 5 6 7 LOOP
3 8
2 9 RELAY 1
1 10
RELAY 2
SENSITIVITY
45º
R11 R12 R13
A1 A2 E2
b
30 cm
1 foot
45º
To reduce stress on the cable and thereby prolong its service life, it is important to avoid sharp bending
of the cable. This is done by cutting a groove at 45 degree angles in each corner. The best signal
condition for detecting a vehicle, is obtained when the width of the loop (a) is approximately the same
as the track width of the vehicle. The width of the loop should therefore aim to have same dimension
as the vehicles which needs to be detected.
Track width
Favourable
18
Rev.00 - 03.2019 | LDD1/LDD2 Single and Dual Loop Detector | © 2019 | CARLO GAVAZZI Industri
a
45º
30 cm
1 foot
45º
Unfavourable
a
45º
b
30 cm
1 foot
45º
L11 L12 E1
R21 R22 R23
4 5 6 7
3 8
2 9
1 10
SENSITIVITY
45º
R11 R12 R13
A1 A2 E2
30 cm
1 foot
45º
Unfavourable
LOOP
RELAY 1
RELAY 2