Planning the cable path
Page 48 OmniTrax Product Guide
There are three options for when the cable path approaches a building or obstacle straight-on
(perpendicular).
• bypass the obstacle by routing the sensor cable around the obstacle
• splice in a section of non-detecting cable to pass through the obstacle (see Mid-cable
obstacles (cable bypasses) on page 46)
• cut and terminate the cables 7 m (23 ft.) away from the obstacle
It is also possible to install a processor near an obstacle and use lead-in cable to start the
detection zones on either side of the obstruction (see Beginning of zone obstacles
on page 47). I
Road crossings
In most instances where the sensor cables must cross under a roadway, non-detecting cable is
spliced in at the crossing (see Mid-cable obstacles (cable bypasses)
on page 46). Ideally, a section
of conduit is installed when the road is built, and the sensor cable is pulled through the conduit
when the cables are installed (see Protection of buried cables
on page 37).
There are instances where a road crossing through a zone in soil does not need to be permanently
bypassed. For example, a road that is used occasionally during the day time, but is unused at
night. In this case you can dig the trenches across the road and bury the sensor cables 30 cm
(12 in.) below the road surface. The installation depth in this case is greater than normal, because
of an expected higher sensitivity above the cable caused by the asphalt and gravel road bed. The
segment of cable below and adjacent to the roadway is then set as an independent zone via the
UCM software. The road zone can be accessed in the daytime, while the road is in use, and
secured at night when the road is unused (Silver Network based systems).
Decouplers and obstacles
At decoupler locations, make sure there is both sufficient detection and enough distance for the
detection field to dissipate, especially if the perimeter ends near an obstacle. In medium and heavy
soils, the detection field dissipates 2 to 3 m (6.5 ft. to 10 ft.) past the decouplers. In light soils, the
detection field can continue for greater distances past the decouplers. The minimum separation
distance for sensor cables ending perpendicular to an obstacle for all burial mediums is 7 m
(23 ft.). Terminators are used at the end of OmniTrax perimeters.
Moving objects
If a detection field is located too close to an area where there are moving objects such as vehicles,
equipment, medium or large animals, nuisance alarms could result (see Separation distances from
obstacles on page 42). This includes areas such as roads, walkways, parking areas, exercise
yards, livestock pens or grazing areas, and wooded areas.
When OmniTrax is calibrated and set up, small animals weighing 5 kg (11 lb.) or less are unlikely
to be detected. Avoid areas where medium or large animals (over 5 kg) are not controlled. Animals
in this size category have some probability of being detected. The detection probability generally
increases with size.
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