Preparation of trenches
Page 102 OmniTrax Product Guide
1. Dig two parallel trenches 10 cm wide by 23 cm deep at the specified cable spacing.
2. Lay the sensor cables in the trenches.
3. Verify that the cable is lying at a uniform depth of 23 cm (9 in.).
4. Mark the locations of the red bands on the ground.
5. Pull the cable taut and partially backfill the trench with 7.5 cm (3 in.) of soil as you go to hold
the sensor cable in place.
6. Place cable marker tape in the trench 7.5 cm (3 in.) above the sensor cable (optional).
7. Finish backfilling the trenches.
Burial with a crushed stone topping
Use the following guidelines when installing cable with crushed stone:
• The maximum size for the crushed stone is 19 mm (0.75 in.).
• For a topping that is 5 cm (2 in.) or less, use the standard burial depth and add the crushed
stone on top.
• For a topping that is between 5 and 15 cm (2 to 6 in.) adjust the burial depth to 15 cm (6 in.) in
the soil.
• Spread a stone dust or sand layer on top of the crushed stone to help fill the voids in the
crushed stone.
• For narrow cable spacing (single trench installation) increase the width of the trench from
10 cm to 15 cm (4 in. to 6 in.).
Note Keep the cable spacing (± 5 cm, 2 in.) and burial depth ± 2.5 cm (1 in.)
consistent.
Note Do not cover the ends of the sensor cables as ferrite beads,
connectors, and decouplers must be installed first.
Note Before backfilling the trench to ground level, install the ferrite beads and
connectors, but do not seal the heatshrink at this time (see Installing
cable fittings on page 121). Next, do the cable tests (see Cable tests on
page 146) and then do a sensitivity profile to verify the installation (see
OmniTrax calibration - Sensitivity Profile and Transmitter Power
on
page 197).
Figure 64: Completed soil installation
23 cm
(9 in.)
7.5 cm
(3 in.)
sensor cable
marker tape
To Next Page
Loading...
