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Appendix 4 - Changing the Zone of Detection
There are several ways in which the zone and range of detection can be
adjusted, as follows:
Sensitivity
The higher the sensitivity setting, the wider the zone of detection.
The sensitivity should be set so that small vehicles (or those with small ferrous
content) are detected reliably, but larger vehicles in adjacent lanes are not
detected.
Position
Should it not be possible to achieve reliable detection in the lane of interest using
just the sensitivity switches on the RTM500 Interface Card, it may be possible to
re-position the sensors off centre (i.e either towards the kerb or further out from
the kerb) to achieve better results and lane discipline.
Multiple sensors per lane
In rare situations, it may be desirable to install two or more sensors per lane and
then connect their outputs from the RTM500 Interface Card in parallel to the
controller detector input.
This improves the chance of detecting certain vehicles across a larger lane area
by allowing any of the sensors to provide a detect output to the controller.
