Perimeter layout guidelines
Page 16
FlexPS Product Guide
Fence corners and heavier gauge posts
Corner posts and heavier gauge support posts tend to dampen the fence’s vibration transmission
characteristics. Therefore, use cable loops at corner posts and heavy gauge support posts, to
increase the sensitivity. Each sensitivity loop requires approximately 3.5 m (11.5 ft.) of sensor
cable.
Service loops
Service loops provide extra sensor cable along the fence to make cable repairs. Allot 75 cm
(30 in.) of cable each 15 m (50 ft.) for a service loop. Locate the U-shaped service loops at fence
posts.
Drip loops
Drip loops raise the connector above the sensor cable to prevent water from running along the
cable and accumulating in the enclosure. Drip loops also relieve strain resulting from temperature
changes that cause the cable to expand and contract. Form the drip loop by raising the connector
15 cm (6 in.) above the level of the cable run. Allot 50 cm (20 in.) of cable for each splice or
termination.
Note
If the lower edge of the fence fabric is embedded in a concrete
footing, or below ground, use an additional cable pass on the lower
section of fence to increase the sensitivity.
Note
If the fence framework includes an intermediate (middle) rail, then
there must be at least one cable pass above the rail and one cable
pass below the rail.
Figure 7: Cable pass recommendations
Note
Fences that use vinyl privacy slats may not be suitable for use with
a FlexPS sensor system, as the privacy slats have a tendency to
dampen vibrations.
h > 4.5 m (> 15 ft.)
h = 2.5 to 4.5 m (8 to 15 ft.)
h = 2.5 m (8 ft.)
1/2 h
1/2 h
1/3 h
1/3 h
1/3 h
1/4 h
1/4 h
1/4 h
1/4 h
sensor cable
and vinyl coated fences
single pass
double pass
triple pass
1/4 h
1/4 h
1/4 h
1/4 h
double pass (minimum)
fences with a middle rail