RIB ACG9064, Manual, Page: 8 / 20

8
G
B
REALISATION OF THE SENSITIVE ELEMENT
The detectors are suitable for loops made up with an insulated copper wire with a cross-
section of at least 0.5 sq. mm. Preferably use twisted copper wires with at least 20 twists
per metre to connect the detector to the loop. Jointing in the loop wires and in the twisted
cable is not recommended. If unavoidable, jointings should be welded and sealed in an
appropriate watertight junction box to ensure best detector operation. If the wires used for
the twisted cable are especially long or in proximity to other power cables, shielding of said
wires is recommended. Earthing of the shield should only be made at the extremity of the
detector.
Excepting special cases, the detection loops should be rectangular. Install with the longer
sides placed at right angles in the direction of vehicle movement. These sides should ideally
be kept at a meter one from the other. Loop length is a function of the width of the road
surface to be monitored. A distance of no more than 300 mm is recommended between
the loop and each edge of the road surface. For loops running over a perimeter of more
than ten metres two wire windings are normally employed, while for loops with a lower
perimeter three or more windings are required, and four windings are required for loops
with a perimeter below six metres.
In order to reduce possible troubles, adjacent loops should be so laid as to alternate
three and four windings.
All permanent loop components must be secured to the road surface (Fig. 1) in appropriate
grooves made using masonry cutting tools or the like. A cross-cut at a 45° inclination must
be made at the circuit angles so as to prevent the risk of the loop cable being damaged in
proximity to the apex of the right angles.
Nominal groove length: 10 ÷ 15 mm.
Nominal groove depth: 30 ÷ 50 mm.
The loop-detector connection cable must also be laid in an appropriate groove running from
one of the circuit angles along the circuit perimeter to the road surface edge. To ensure
wiring continuity between the loop and connection cable allow for a long enough lead to
reach as far as the detector before inserting the cable inside the loop groove. After laying
the required number of wire windings in the groove along the loop perimeter, route the wire
towards the road edge through the connection cable groove.
It is advisable that connection cable length not exceed 100 metres. As loop sensitivity
diminishes proportionally to connection cable length the latter should be kept as short as
possible.
Loops are secured to road surface by means of a quick-drying compound containing epoxy
resin or asphalt mastic applied hot.
In the case of two contiguous loops, keep a minimum distance of at least two metres
between each.
Note:
The inductive activity and hence the sensitivity of the loop detection
system is reduced by the presence of a steel reinforcement beneath the road surface. Ideally
allow for a distance of 150 mm between loop cable and steel reinforcement.
In order to obtain an optimal working of the system it is advisable to use the RIB
loops.
Figures 2A and 2B represent examples of connection of these loops to the detector.
2A
Detector
5 m
(recommended)
Cable 2 x 0,5 mm 2 , l = 15 m
(conform to CEI 20-22 II)
2 m
1 m
Detector
5 m
(recommended)
Cable 2 x 0,5 mm 2 , l = 15 m
(conform to CEI 20-22 II)
3 m
2 m
2B
10 ÷ 15 mm
30 ÷ 50 mm
loop
1
TECHNICAL FEATURES
Power supply
Consumption
Connectable loop
Number of outputs
Types of outputs
Impulsive output
Exit presence
Relay contact capacity
Signal
Working temperature
Size / Weight
Range of tuning of the detector
11/26 V ac/dc
40 mA st.by - 95 mA max
2
2
Impulsive and/or presence
N.O. relay output - impulse adjustable from 0,2 to 1 second
N.O. relay output - only in presence
0,5 A @ 230 V ac
Led for presence of power supply - Led for state testing of the loops - Led for defective loops
-20/+55 °C
80 x 79 x 40 / 110 gr 80 x 79 x 40 / 200 gr
15 - 1500 μH
GENERAL INFORMATION
ACG9064 is a magnetic loop detector, designed and manufactured to manage two magnetic
loops and to give one control pulse when the passage of a metal body (vehicle, motor-bike,
etc..) on the loop is detected.
MAIN CHARACTERISTICS
- Connection of two magnetic loops
- easy control of functions through dip-switch
- 2 relay outputs with N.O. available
- Function selection by means of binary dip-switches