Soil; Asphalt - Optex Fiber SenSys Terrain Defender TD 100 Installation Manual

Soil

Burial depths are dependent on soil type, asphalt, crushed stone, and concrete.
o Standard soil is the simplest of mediums to install. Maintain 23 cm (9 in) burial depth.
o There are various clay soil consistencies. Knowing which you are working with will help
when planning the site civil work and TD100 components.
o When a heavy clay medium is present, 15 cm (6 in) burial depth is optimal. It
may be necessary to add additional processing to maintain the specific PD/NAR
requirements. With TD100, if Probability of Detection (PD) is not favorable, add a
middle TD100 Processor Kit, in-line anywhere along the detection cable to
increase the gain between processors needed to reduce clay soil effects.
TD24/48PSU
(24 or 48VDC)
TD100
Lead
*Note: PSU connection is with SUMA. The above
illustration is to depict that adding processors doesn't
necessarily require adding power supplies.

Asphalt

When an application requires sensor cables to be installed in asphalt, it is necessary to
determine the thickness. Asphalt material properties do not contain the RF signal as much
as soil, and in most cases, it would be like installing the cable on top of the ground. Also,
avoid placing the sensor cable so deep that the height of the detection field is reduced.
o Asphalt will require cutting a wide section out, 15 cm+ (6 in+), that allows for the removal
of spent materials and access to the soil below where manual digging or mechanical
trenching can be used to reach the appropriate sensor cable depth.
Page 27
Added TD100 unit
to improve PD
TD100
Middle
15 cm (6 in)
Clay
Figure 19: Burial in clay versus soil w/ added TD100
Burial Depth
TD100
Middle
15 cm (6 in)
Clay
Sensor Cable
Confidential – Limited Distribution
TD24/48PSU
(24 or 48VDC)
TD100
End
23 cm (9 in)
Soil