Cable Installation And Splicing; Table 2: 4830 Wiring Chart - Geokon 4800 Series Instruction Manual

SENSOR WIRING
4830-1 Wiring Table
Wire Colors
(GEOKON 02-250V6 Blue
Cable)
Red Pressure Cell Sensor +
Black Pressure Cell Sensor -
White Thermistor
Green Thermistor
Bare Ground (Shield)

TABLE 2: 4830 Wiring Chart

2.3 CABLE INSTALLATION AND SPLICING

Cable placement procedures vary with individual installations. In general,
however, all installations have in common the following requirements:
1. The cable must be protected from damage by angular particles of the
material in which the cable is embedded.
2. The cable must be protected from damage by compaction equipment.
3. In earth and rock embankments and backfills, the cable must be protected
from stretching as a result of differential compaction of the embankment.
4. In concrete structures, the cable must be protected from damage during
placement and vibration of the concrete.
In embankments, cables may be embedded in a protective covering of sand or
selected fine embankment materials. A typical installation might, for example,
comprise the positioning of a series of cables on a prepared layer consisting of
not less than 200 mm (8") of compacted selected fine material. To establish an
acceptable grade without undue interference with construction operations, the
prepared layer may be located either in a trench or on an exposed ramp. In
rockfill dams with earth fill cores, for example, it is frequently convenient to
install cable in trenches in the core and fine filter zones, and in ramps in the
coarse filter and compacted rockfill shell zones. Individual cables should be
spaced not less than 12 mm (0.5") apart, and no cable should be closer than 150
mm (6") to the edge of the prepared layer. In instances in which cables must
cross each other, or in which more than one layer of cables must be placed in a
given array, the cables should be separated from each other by a vertical interval
of not less than 50 mm (2") of hand compacted sand or selected fine
embankment material. Since the elongation capability of electrical cable is quite
substantial, it is not necessary to install the cable with any "S" shaped meanders.
During the backfill of trenches in earth dams, a plug, approximately half a meter
(two feet) in width, made of a mixture of 5% bentonite (by volume) from an
approved source and exhibiting a free swell factor of approximately 600%, and
95% embankment material, can be placed in the trenches at intervals of not
greater than 20 meters (50 feet). The purpose of the bentonite plugs is to reduce
the possibility of water seepage through the embankment core along the
backfilled trenches.
The cable may be marked by using a Mylar cable labels. For an individual cable,
the identification number should be taped near the end of the cable. Additional
cable labels can be specified to aid in identification if cables need to be dug up
for splicing, etc.
Splice kits recommended by
around the splice and are then filled with epoxy to waterproof the connections.
When properly made, this type of splice is equal or superior to the cable in
MODEL 4800 SERIES VW EARTH PRESSURE CELLS | INSTALLATION | 13
4830-2 Wiring Table
Function Wire Colors
(GEOKON 04-375V9 Purple
Cable)
Red
Red's Black
White
White's Black
Blue
Blue's Black
Bare
incorporate casts, which are placed
GEOKON
2:
Function
Pressure Cell Sensor +
Pressure Cell Sensor -
Piezo Sensor +
Piezo Sensor -
Thermistor
Thermistor
Ground (Shield)