Installing the sensor cable
FlexZone Product Guide
Page 35
Double pass cable installation
For double cable pass installation use both sides of one processor for the upper and lower cable
runs. The FlexZone sensor monitors the received signals from both sensor cables to determine
intrusion activity. Therefore, it is critical that the features and lengths of both cables are properly
matched.
illustrates the double pass concept for a single processor installation. For
multiple processor installations the upper cables and lower cables of two processors are joined by
spice kits (see
Installing cable on chain-link fences on page
to attach FlexZone sensor cable in a double pass configuration. The cable spacing for a double
pass configuration is 1/3 the fence height for the lower pass and 2/3 the fence height for the upper
pass. If the double pass is required because the fence has a middle rail, then the lower pass
should be 1/2 way between the middle rail and the ground, while the upper pass should be 1/2 way
between the middle rail and the top of the fence.
Figure 30: Welded-mesh fence
Note
Lay the two cables side by side on the ground beside the fence after the
conditioning procedure, and mark the two cables with tape every 5 m
(16 ft.). This will facilitate length matching during cable installation.
Figure 31: Double pass cable installation
sensor cable on the same side as the horizontal wires
sensor cable on the opposite side of the horizontal wires
sensor cable
cable tie
attach sensor cable snugly
to the horizontal wire
attach sensor cable
to the intersection of
the horizontal and
vertical wires
sensor cable
cable tie
A side cable
B side cable
matching
start points
e.g., 2 m
cable tie spacing
consistent for
both passes
service loop
identical
features
zone demarcation loop
matching
end points at
terminators
e.g., 275 m
max. 300 m
5 m tape
markers for
length matching