Start-Up Module Assembly (Suma) / Start-Up Modules (Sum) - Optex Fiber SenSys Terrain Defender TD 100 Installation Manual

5. Start-Up Module Assembly (SUMA) / Start-Up Modules
(SUM)
The TD100 product uses a standard, modified coaxial cable sensor element. The cable has two
outer jackets separated by a flooding compound designed for direct burial. Beneath the two
jackets, there is an outer conductor which has two parts; a foil tape that allows for a slotted
aperture and a braided conductor that provides a low resistance DC path to accommodate
power supplied over the cable. Unlike other custom leaky coax cables, the slot width formed by
the foil is constant over the length of the cable.
The leaky cable is connected to a coaxial lead-in cable which connects to the processor. The
connection between the sensor and the lead-in is made inside the Start-Up Module Assembly
(SUMA), which is designed for direct burial. The connection is made inside the SUMA in an RF
shielded stainless steel box, called the Start-Up Module (SUM). This note describes how to
install the shielded termination.
16.59mm 14.28mm
Page 32
Figure 23. Sensor Cable Overview (Side)
11.75mm 4.47mm
Figure 24. Sensor Cable Overview (Cross Section)
4.47mm
Confidential – Limited Distribution
Outer jacket
Drain Wire
Center Conductor
Dielectric
Shield
Inner Jacket
Floodant
Drain wire: Braided Tinned Copper
Dielectric: Gas Injected Foam Polyethylene
Shield: Bonded Aluminum
Center Conductor: Solid Bare Copper Clad Aluminum
Shield Slot
Inner Jacket: Polyethylene (PE)
Flooding compound
Outer Jacket: Polyvinyl Chloride (PVC)