Installation tips
Page 82 OmniTrax Product Guide
Protection for roadway and sidewalk crossings
For roadway and sidewalk crossings the sensor cable can be protected with PVC conduit as
follows. The full length of a sensor cable must not be installed in conduit.
• The maximum length for conduit sections is 7.0 m (23 ft.).
• A maximum of 3 sections of conduit can be used on a single cable set.
• Conduit sections must be separated by at least 1 m (3 ft., 3 in.).
• Conduit must be sealed at both ends to prevent internal water flow.
• Conduit must be the minimum diameter that allows passage of the sensor cable.
Installation tips
• Use a trenching machine to dig the trenches around the perimeter (15 cm, 6 in. for single
trench installation; 10 cm, 4 in. for dual trench installation).
• Use a trenching machine or a backhoe with a 30 cm (1 ft.) bucket to dig the lead-in cable
trenches at the processor location.
• If the processor is being installed in a telecom style enclosure, dig the lead-in cable trenches
to a depth of 60 cm (2 ft.).
• Line up the red bands at the start of the detecting cable, and secure the cable so the red
bands cannot move.
• Run the cable back to the processor, ensuring that there is enough cable to make the
connections to the processor (min. 2 m 6.5 ft.).
• Carefully, follow the directions for sensor cable crossover at the start point.
• Begin at the processor location and work toward the end of the sensor cables.
• At the end of the sensor cable dig out the decoupler pattern (should be marked on ground).
• Ensure that there is enough cable at the end to make the decoupler connections. If there is
extra cable at the end point, leave it on the reel until you are ready to make the connections.
• Use a shovel or garden rake to clear the soil at depth measuring points along the trenches.
• Make a measuring stick by attaching a small board (e.g., 1 X 2) perpendicular to a larger board
(e.g., 1 X 3 or 2 X 4) at the 23 cm (9 in.) point (a right angle cross). Use the board to verify that
the trench has a uniform depth of 23 cm.
• When burying the cables, have one person hold the cable in place (e.g., stand on cable) have
a second person pull the cable straight, and have a third person backfill the trenches.
• When backfilling the trenches, shovel the soil lengthwise into the trench so that it will spread
out and fill any gaps around the sensor cable.
• For narrow cable spacing, build a tool that can be pulled along and will keep the cable spacing
at 10 cm (see Figure 60:
).
• For long perimeters, a cable dispenser on wheels will facilitate the cable installation.
• When using geotextile fabric and a sand bedding:
• Make a second measuring stick for a depth of 30 cm (12 in.).
• Ensure that the trench is a uniform depth of 30 cm (12 in.) before laying the geotextile
fabric.
• Cut or fold the fabric to make it fit as the cable path goes around turns.
• Stake down the fabric to hold it in place while pouring sand.
• Do the recommended cable tests and a cable profile before sealing the heatshrink on the
connectors and decouplers.
• Seal the heatshrink and finish the backfilling.
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