General Information; Main Characteristics; Technical Features - BFT RME Manual Del Usuario

RME
1.

GENERAL INFORMATION

RME is a magnetic loop detector, designed and manufactured to manage a magnetic loop and to give two control pulses when the
passage of a metal body (vehicle, motor-bike, etc..) on the loop is detected.
Compliance with stringent European standards also ensures maximum performance and reliability.
2.

MAIN CHARACTERISTICS

Magnetic coil connection
Easy operation by means of dip-switch
Two relay outputs
Function selection by means of binary 8-way dip-switches
3.

TECHNICAL FEATURES

Power supply
Consumption
Connectable loop
Number of outputs
Types of outputs
Output 1 (OUT1)
Output 2 (OUT2)
Relay contact capacity
Signal
Working temperature
Size / Weight
4. REALISATION OF THE SENSITIVE ELEMENT (Fig. 1)
The detectors are suitable for coils made up with an insulated copper wire with a cross-section of at least 1.5 sq. mm. Preferably use
twisted copper wires with at least 20 twists per metre to connect the detector to the coil. Jointing in the coil 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 coils 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. Coil 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 coil and each edge of the road surface. For
coils running over a perimeter of more than ten metres two wire windings are normally employed, while for coils with a lower perimeter
three or more windings are required, and four windings are required for coils with a perimeter below six metres.
In order to reduce the diaphonic effect, adjacent coils should be so laid as to alternate three and four windings.
All permanent coil components must be secured to the road surface 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 coil cable being damaged in proximity to the
apex of the right angles.
Nominal groove length: 4 mm.
Nominal groove depth: 50 mm.
The coil-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 coil and connection cable allow for a long enough lead to
reach as far as the detector before inserting the cable inside the coil groove. After laying the required number of wire windings in the
groove along the coil 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 coil sensitivity diminishes proportionally to connection cable length
the latter should be kept as short as possible.
Coils are secured to road surface by means of a quick-drying compound containing epoxy resin or asphalt mastic applied hot.
0,3 m
24 – 12 V AC/DC
20 mA st.by – 40 mA max
Impulsive and/or presence
N.O./N.C. relay output
impulsive (100 ms.)
N.O./N.C. relay output
impulsive (100 ms) or presence
0,5 A @ 24 V
88 x 76 x 38 mm // 85 g
max. 1 m
5 m
(recommended)
0,3 m
ENGLISH
1
2
Red LED
-20/+55 °C
10 ÷ 15 mm
3
04/05 – D811476_02
Fig 1
30
÷
50
mm