Manual Nortech PD-132 (page 16 of 29) (English)

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301UM0030_01 PD130 Enhanced Vehicle Detector User Manual Page: 16 of 29

5.4 Sensing Loop Geometry

NOTE: 1) The circumference of the loop must not exceed 30 m.

2) The area of the loop must not exceed 30 m² and must not be less than 1 m².

3) The loop must be constructed as detailed below.

Sensing loops should, unless site conditions prohibit, be rectangular in shape and should normally be

installed with the longest sides at right angle to the direction of traffic movement. These sides should

ideally be 1 metre apart.

The length of the loop will be determined by the width of the roadway to be monitored. The loop should

reach to within 300mm of each edge of the roadway.

In general, loops having a circumference measurement in excess of 10 metres should be installed

using two turns of wire, while loops of less than 10 metres in circumference, should have three turns

or more. Loops having a circumference measurement less than 6 metres should have four turns. It is

good practice at time of installation to construct adjacent loops with alternate three and four turn

windings.

For additional Information on loop geometry refer to the following documents:

• “INDUCTIVE LOOP VEHICLE DETECTION” - Nortech Doc. No. MKT01.

• “TRAFFIC DETECTION CONCEPTS” - Nortech Doc. No. MKT02.

• “PARKING APPLICATION MANUAL” – Nortech Doc. No. MKT03

5.5 Loop Installation

All permanent loop installations should be installed in the roadway by cutting slots with a masonry

cutting disc or similar device. A 45° crosscut shou ld be made across the loop corners to reduce the

chance of damage that can be caused to the loop at right angle corners.

NOMINAL SLOT WIDTH: 4 mm

NOMINAL SLOT DEPTH : 30 mm TO 50 mm

A slot must also be cut from the loop circumference at one corner of the loop, leading to the roadway

edge to accommodate the feeder.

A continuous loop and feeder is obtained by leaving a tail long enough to reach the detector before

inserting the cable into the loop slot. Once the required number of turns of wire are wound into the slot

around the loop circumference, the wire is routed again via the feeder slot to the roadway edge. A

similar length is allowed to reach the detector and these two free ends are twisted together to ensure

they remain in close proximity to one another. (Minimum 20 turns per metre) Maximum recommended

feeder length is 100 metres. It should be noted that the loop sensitivity decreases as the feeder length

increases, so ideally the feeder cable should be kept as short as possible.

The loops are sealed using a “quick-set” black epoxy compound or hot bitumen mastic to blend with

the roadway surface.

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Nortech PD-132 Manual

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