User's Guide

6
•
Expanse XP20 User Guide
˿
Make sure all monitored lanes are within 6 to 250 ft. (1.8 to 76.2
m) of the sensor. Up to 22 lanes can be detected.
˿
If you’re putting a sensor on a road with stoplights or stop
signs, position the sensor toward middle of the block, to reduce
the likelihood of having stopped vehicles in the XP20 radar
footprint.
Figure 2. Midblock installation
˿
Keep cable lengths in mind when you pick mounting locations;
when you use a Wavetronix or Wavetronix-recommended
cable, the cable run between the XP20 and the cabinet can be
as long as 2000 ft. (609.6 m).
˿
Consider timing: after a vehicle passes in front of the sensor,
there’s a slight delay before the data for that vehicle is sent
from the sensor.
˿
In a time-sensitive application, like supplying a variable mes-
sage sign with per vehicle warning messages, make sure the
sensor is far enough upstream from the sign that the system
has time to collect the data, process it, and send it to the sign
by the time the vehicles reach the problem area.
˿
See if you can take advantage of any existing infrastructure in
the area. The sensor can be mounted on existing poles (with
the exception of wooden poles), as long as they fall within the
acceptable oset range. You may also be able to tap into exist-
ing cabinets, power sources, and communication networks. All
of these options could save you time and money.
Note. You can
purchase your cable
from Wavetronix
or from a cable
manufacturer. If you
do the second, we
recommend you
purchase either the
Alpha Wire 6453 or
Belden 3105A cable.