Perimeter layout
Page 54 OmniTrax Product Guide
There are three types of sensor cables available with the OmniTrax system (see Cable installation
overview on page 97). The type of cable to choose depends on the length of the perimeter, the
selected cable path, and the installation space that is available. Figure 4:
provides comparisons
between the three available cable types.
• OC2 sensor cable is available in lengths of 300 and 400 m of detecting cable + 20 m lead-in.
OC2 cable was designed specifically for use with the OmniTrax sensor, and is recommended
for use in most instances. It is ideally suited for long perimeters with each processor capable
of monitoring up to 800 m of sensor cable.
• SC2 sensor cable is available in lengths of up to 200 m of detecting cable + 20 m lead-in. SC2
was originally developed for the Perimitrax sensor and works very well with OmniTrax. SC2
cable is typically used at sites with shorter perimeters. One OmniTrax processor can monitor
400 m of SC2 sensor cable.
• SC1 sensor cable is available in lengths of up to 200 m of detecting cable + 20 m lead-in. SC1
cable combines both the transmit cable and the receive cable in a single outer jacket. SC1
cable is typically used at sites where the cable path meanders and turns due to numerous
obstacles.
Sensor cable burial depth
Sensor cable burial depth depends on the burial medium and may depend on perimeter obstacles
(see Sensor cable burial depths
on page 36). Cables should be buried at a uniform depth
throughout each medium. The better the consistency of the burial depth, the better the system will
perform. Typically, a tolerance of 10% of the burial depth or better is desirable. If the burial depth
must be changed, do so gradually. If the surface grade changes by more than 30° in a distance of
4 m (13 ft.), even it out.
Sensor cable spacing (OC2, SC2)
OC2 and SC2 transmit and receive cables are installed parallel to each other. The distance
between the transmit and receive cables must remain constant over the length of a cable set. The
detection field’s size depends on both soil type and cable spacing. The minimum separation
between the TX and RX cables is 10 cm (4 in.). The maximum separation is 2 m (6.5 ft.). The
recommended cable spacing, which should be used whenever possible, is 1.5 m (5 ft.).
Cable layout at processors
To ensure full continuous detection at a processor location the sensor cables are overlapped by
8 m (26 ft.) (see Sensor cable start points
on page 115). The detection field requires approximately
4 m (13 ft.) from the red band on the cables to build up to full strength. Therefore, each cable
comes with an additional 4 meters of detecting cable (e.g., 400 m OC2 cable includes 404 m of
detecting cable). To provide continuous detection between both cable sets on one processor
(A-side, B-side) the sensor cables must overlap at the point where the two detection fields reach
full strength (4 m beyond the red bands). An 8 m overlap ensures continuous detection between
the two cable sets, where the active cables begin.
Note - SC1 Use the cable side with the ribbed surface as the receive cable
and the cable side with the smooth surface as the transmit cable
(by convention - ribbed = RX).
Note An intruder who crosses the two cable sets where they overlap can be
detected by both cable sets.
ribbed
smooth
surface
surface
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