Installing the sensor cable
FlexPS Product Guide
Page 25
7.
The second person picks up the sensor cable near the first, and waves it up and down a few
times creating small waves, which travel approximately 3 to 5 m (10 to 15 ft.) in both directions
along the cable.
8.
At the same location, the second person taps the cable with the handle of a screwdriver a few
times, and then repeats the waving. (As you tap the cable, you will hear the center conductor
rattle inside.)
9.
Move along the sensor cable, waving, tapping, and waving the cable at one meter intervals.
Listen for the rattle, with each tap of the cable. Continue waving and tapping until you reach
the end of the cable.
10. When the second person reaches the end of the sensor cable, the first person releases the
tension on the center conductor at the other end.
Cable conditioning procedure (part 2 - cable flossing)
Pull the cable by the outer jacket to remove any slack and then use a “flossing” motion to pull the
center conductor back and forth to ensure the center conductor is floating freely over the full length
of the sensor cable.
Note
Maintain a firm grip and consistent pulling tension, and keep the sensor
cable taut and in-line with the second person during the center
conductor loosening procedure.
Figure 13: Applying tension to the center conductor / Waving the sensor cable
Figure 14: Tapping the sensor cable / Waving the sensor cable
Note
Initially, there may be resistance as well as some “stretching” as the
center conductor is freed inside the cable (i.e., the center conductor
pulls out at one end but remains the same length at the other). Once the
center conductor moves back and forth so that pulling it out 15 cm
(6 in.) at one end causes it to retract 15 cm at the other end, the
conditioning is complete.
Note
If the center conductor does not move back and forth easily (or at all)
during the flossing process, it is likely bound somewhere inside the
cable. In this case, repeat waving and tapping and flossing until the
center conductor moves freely and easily.
apply 2 kg (4.5 lb) of light pulling
first person
second person
apply tension to the center conductor while waving the cable
tension to the center conductor
first person
second person
repeat waving the cable at this location
tap the sensor cable and
first person
second person
listen for the rattle
apply tension
apply tension