Planning the cable path
Page 36 OmniTrax Product Guide
Sensor cable burial depths
OmniTrax sensor cables are typically buried in soil at a depth of 23 cm (9 in.). The soil in the trench
should be clean and free of debris and stones, which could damage the sensor cables (see
Digging the trenches
on page 99). Although minor variations in the burial depth can be
compensated for by adjusting the configuration settings, for optimum detection consistency and
cable protection, a uniform burial depth is recommended.
Sensor cable spacing (OC2, SC2)
OC2 and SC2 transmit and receive cables are installed parallel to each other around the site
perimeter. The distance between the transmit and receive cables must remain constant over the
length of a cable set. The recommended cable spacing between OmniTrax TX and RX sensor
cables is 1.5 m (5 ft.). The absolute minimum cable spacing is 10 cm (4 in.). The maximum cable
spacing is 2 m (6.5 ft.). Anything closer than 10 cm will result in high clutter and a poor signal to
noise ratio (i.e., potentially high NAR). Anything wider than 2 m can prevent the effective signal
coupling between the transmit and receive cables (i.e., potentially low Pd). Use the recommended
cable spacing (1.5 m) whenever possible.
Note Extremes of natural soil types such as very dry sand or heavy clay may
require variations in installation methods and burial depths. Contact
Senstar Customer Service for additional information.
Medium Nominal burial depth
soil, sand & soil mixture, or gravel 23 cm (9 in.) ± 2.5 cm (± 1.0 in.)
moderate to heavy clay 15 cm (6 in.) ± 1.3 cm (± 0.5 in.)
narrow strip of asphalt
(e.g., a driveway)
30 cm ± 2.5 cm (12 in. ± 1 in.) for asphalt installations where
the cables are also buried at 23 cm in the surrounding soil
asphalt (large surface)
(e.g., runway or parking lot)
23 cm ± 2.5 cm (9 in. ± 1 in.) for asphalt installations in large
paved surfaces
non-reinforced concrete < 13 cm
(5 in.) thick
23 cm (9 in.) ± 2.5 cm (± 1.0 in.)
non-reinforced concrete > 13 cm
(5 in.) thick
slots - 6 cm (2.25 in.) ± 6 mm (± ¼ in.)
reinforced concrete any thickness slots - 6 cm (2.25 in.) ± 6 mm (± ¼ in.) (cable must be at
least 2.5 cm (1 in.) above the metal reinforcement)
Note Keep the cable spacing uniform ± 5 cm (2 in.) for the full length of the
cable route. For minimum cable spacing the tolerance is + 2.5 cm (1 in.)
(no minus tolerance).
Note Narrow cable spacing with a dual cable system (OC2, SC2) provides
superior performance over a single cable system (SC1).
Note Contact Senstar Customer Service if you have difficulty meeting the
required cable separation as there are mitigating installation
techniques.
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