FoldSmart™ Installation and Maintenance Manual
Revision 1 - MAY 2023
109
INSTALLING VEHICLE DETECTORS AND LOOPS
Installing Vehicle Detectors and Loops
A vehicle detector passes a small current flow through the “loop” which then becomes an inductive
coil. When a vehicle passes over the loop, the detector senses the resultant drop in the inductance, and
actuates the detector output.
Loop Configurations:
Configurations differ depending on the application.
Rules to Follow for Security Gate Applications:
The side of the loop closest to the gate must be located at least 4 ft (122cm) from the line of travel.
1�
The shortest side of the loop should be between 6 and 8 feet (1.8 x 2.4m) in length. The longest side
of the loop should be between 6 and 20 feet (1.8 x 6.1m) in length. For applications that need to
span a wide area, use several smaller loops. Do not connect more than 200 square feet (18.6 sq. m)
of loop area to a single detector.
2�
In applications with multiple loops, keep each loop at least 6 feet (1.8m) apart. This avoids “cross
talk”. It is possible to have loops closer together by selecting different frequencies. An advantage
of using model HY5B detectors is that problematic “cross talk” is not possible.
3. For greater sensitivity and less chance of false calls caused by the motion of the gate, it is better to
use multiple smaller loops, connected in a series circuit, to one detector instead of a single large
loop.
4�
To avoid interference, keep loops at least 2 inches (5cm) above any reinforcing steel. Do not route
loop wires with, or in close proximity to, any other conductors, including other loop leads, unless
shielded lead-in cable is used. Never route high voltage circuits in PVC conduit near a loop.
5�
Loop and lead-in wire should be one continuous piece. Avoid splices, if possible. If a splice is
necessary for any reason, “pot” the splice in epoxy or use heat shrink to ensure that the quality of
the splice covering is the same as the original wire jacket.
6�
Use only 14-, 16-, or 18-gauge stranded wire with a direct burial jacket. Cross
-
linked polyethylene
insulation types, such as XLPE or XHHW, will last much longer and are less prone to damage during
installation than conventional insulation types. Preformed loops can be used before road surfacing
or under pavers.
7�
Twist loose tails of lead-in wires tightly, approximately ten times per foot. See Figure 22.
8�
Follow this guide for the correct number of turns in the loop;
12 to 20 sq. ft. = 5 turns
20 to 60 sq. ft. = 4 turns
60 to 240 sq. ft. = 3 turns
3.7 to 6.1 sq. m = 5 turns
6.1 to 18.3 sq. m = 4 turns
18.3 to 73.1 sq. m = 3 turns
Figure 22
.
Lead-in Wire Twisting
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