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APPENDIX C. SPLICING 4650 SETTLEMENT SENSOR TUBING AND
CABLE
C.1 Replacing a Transducer
The most critical aspect of this operation is making sure that no air is allowed to get into the
liquid lines.
The first step is to remove the faulty sensor by cutting both the liquid line and the cable from the
faulty sensor using the procedures below.
C.1.1 Liquid Line
Extreme care must be exercised during this operation. The first step is to carefully strip a
section of the outer (yellow) jacket off the tubing bundle to in preparation for splicing to
the new sensor. This is a somewhat delicate operation as the jacket is tightly wrapped
around the inner tubes. Practice the operation first on a waste piece of tubing bundle.
The new sensor should have the union already attached and ready to accept the tubing.
Check to see that the sections of exposed tubing (including the part that must be prepared
for the connection) will be short enough to fit into the splicing kit, and the outer jacket
will be in the epoxy when finished
Be sure that the reservoir water level is maintained during the splicing operation and that
the balance tube is disconnected from the top of the reservoir.
1)
Cut one of the tubes about 50 mm (2") beyond the yellow jacket and immediately
block the end so that no fluid can flow.
2)
Place the correct nut and ferrule pack over the end of this tube, and then block the
flow.
3)
Next, remove the cap from one of the lines on the replacement sensor and make sure
the fluid is right at the top of the exposed tube. If the fluid is not there, top this up
with the small syringe provided with the sensors.
4)
Attach the previously cut tube with the nut and ferrule to the Swagelok union with
fluid flowing from the reservoir to avoid any air being trapped in the joint. (See
Appendix D for Swagelok instructions.)
5)
The next operation is to repeat steps one through four with the other tube — with one
exception — before making the connection with the tube and the union, keep the tube
with the nut and ferrule blocked while removing the cap from the union and letting a
small amount of liquid flow from the union. Next, block that flow and let a little flow
from the tube to be attached. Attach the tube, allowing a little fluid to flow while
making the connection. Tighten the Swagelok per the instructions in Appendix D.
