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TECHNICAL SUPPORT 1 800 908 0884
21
VEHICULAR LOOP DETECTOR INSTALLATIONVEHICULAR LOOP DETECTOR INSTALLATION
Twist Wire Outside the
Loop 6 Twists/Foot
Until Its Connection
to the Loop Detector
1/8" to 1/4" Saw Slot
Provide Additional Saw Cuts
to Eliminate Sharp Corners
Continuously Wind Wire
in Loop Slot for the
Required Number of Loops
(2 Loops Shown)
Guidelines for Vehicular Loop Detector Installation
1. Prevent sharp corners in the geometry of the loop sensor.
2. Install the appropriate number of turns for your loop geometry based on the loop perimeter. Use
Table C (below) as a guide.
3. Use XLP (cross-linked-polyethylene) type of wire. This wire reduces the effects of moisture and
other environmental events in altering the functionality of the vehicular loop detector.
4. Twist the lead wire at least 6 turns per foot.
5. Use BACKER-ROD to minimize damage to the loop detector wire prior to using the sealant.
6. Place the loop detector wire and adjust the sensitivity of the vehicular loop detector unit in a
way to minimize the effects of the gate over the loop detector wire.
IMPORT
ANT – Some of the following parameters may affect the proper functionality of the
vehicular loop detector (consult the installation manual and the manufacturer of the
vehicular loop detector).
• Gate size,
• Number of turns in the loop sensor wire;
• Distance from the loop sensor wire to the gate either at the open or close position.
1" Min.
Backer-Rod
Vehicular Loop
Detector Wire
(3 Turns Shown)
Sealant
Saw Cut
Table C – Recommended Number of Turns
Perimeter in Feet Number of Turns
10 5
20 4
30-40 3
50-100 2
W
W
A
A
R
R
N
N
I
I
N
N
G
G
–
–
C
C
o
o
n
n
s
s
u
u
l
l
t
t
t
t
h
h
e
e
i
i
n
n
s
s
t
t
a
a
l
l
l
l
a
a
t
t
i
i
o
o
n
n
i
i
n
n
s
s
t
t
r
r
u
u
c
c
t
t
i
i
o
o
n
n
s
s
f
f
r
r
o
o
m
m
t
t
h
h
e
e
l
l
o
o
o
o
p
p
d
d
e
e
t
t
e
e
c
c
t
t
o
o
r
r
m
m
a
a
n
n
u
u
f
f
a
a
c
c
t
t
u
u
r
r
e
e
r
r
.
.
T
T
h
h
e
e
f
f
o
o
l
l
l
l
o
o
w
w
i
i
n
n
g
g
s
s
t
t
a
a
t
t
e
e
m
m
e
e
n
n
t
t
s
s
a
a
r
r
e
e
p
p
r
r
o
o
v
v
i
i
d
d
e
e
d
d
a
a
s
s
a
a
g
g
u
u
i
i
d
d
e
e
b
b
u
u
t
t
d
d
i
i
f
f
f
f
e
e
r
r
e
e
n
n
t
t
r
r
e
e
q
q
u
u
i
i
r
r
e
e
m
m
e
e
n
n
t
t
s
s
m
m
a
a
y
y
b
b
e
e
r
r
e
e
q
q
u
u
i
i
r
r
e
e
d
d
b
b
y
y
t
t
h
h
e
e
v
v
e
e
h
h
i
i
c
c
u
u
l
l
a
a
r
r
l
l
o
o
o
o
p
p
d
d
e
e
t
t
e
e
c
c
t
t
o
o
r
r
m
m
a
a
n
n
u
u
f
f
a
a
c
c
t
t
u
u
r
r
e
e
r
r
.
.