Preparation of trenches
Page 112 OmniTrax Product Guide
8. Verify that the slots are the correct depth and that the bottoms and sides of the slots are
smooth.
9. Lay the sensor cable in the slots.
Completing the slot installation
1. Pack the slots with two rows of foam backer rods.
Ensure that the backer rods are slightly wider than the slot, so that they compress as they are
forced into the slot.
2. Mark the red band and decoupler locations.
Joint sealant is required to seal the sensor cable in slots. Use a Senstar approved sealant or
expanding foam sealant tape.
Chemical sealants must be installed in dry conditions. A pump may be required for large
installations. At the specified slot dimensions, estimate 28 liters of sealant for every 100 m of OC2
sensor cable (2.1 U.S. gallons for every 100 ft.) and 20 liters of sealant for every 100 m of
SC1/SC2 sensor cable (1.5 U.S. gallons for every 100 ft.). Allow extra for spillage, and for widened
slots (decouplers, terminators, ferrite beads).
Note Before completing the slot installation, 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). A surface test is also recommended for slot installations
(see The surface test
on page 152).
Figure 76: Slot installation using backer rods
Note Before sealing the slots, 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).
two foam
backer
rods
sensor cable
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