Specifications
Channel Master Operation Manual
page 24 RD Instruments
8.4 Channel Master Re-assembly
To replace the housing, proceed as follows. Use Figure 16, page 23 for
parts identification.
8.4.1 O-Ring Inspection and Replacement
This section explains how to inspect/replace the Channel Master O-ring. A
successful deployment depends on the condition of O-ring and the retaining
groove. See Figure 16, page 23 for the location of the O-ring. Read all in-
structions before doing the required actions.
We strongly recommend replacing the O-ring whenever you disassemble
the Channel Master. Inspecting and replacing the O-ring should be the last
maintenance task done before sealing the Channel Master.
NOTE. We recommend you use new O-rings if you are preparing for a
deployment.
a. Inspect the O-ring. When viewed with an unaided eye, the O-ring must
be free of cuts, indentations, abrasions, foreign matter, and flow marks.
The O-ring must be smooth and uniform in appearance. Defects must
be less then 0.1 mm (0.004 in.).
CAUTION. If the O-ring appears compressed from prior use, replace it.
Weak or damaged O-rings will cause the Channel Master to flood.
b. Clean and inspect the O-ring groove. Be sure the groove is free of for-
eign matter, scratches, indentations, corrosion, and pitting. Run your
fingernail across damaged areas. If you cannot feel the defect, the dam-
age may be minor; otherwise, the damage may need repair.
CAUTION. Check the O-ring groove thoroughly. Any foreign matter in
the O-ring groove will cause the Channel Master to flood.
c. If a scratch is on the plastic housing flange O-ring groove, it may be
gently sanded using 600-grit (wet) sandpaper. Use care not to cause fur-
ther damage.
d. Lubricate the O-ring with a thin coat of DC-111 lubricant. Apply the
lubricant using latex gloves. Do not let loose fibers or lint stick to the
O-ring. Fibers can provide a leakage path.
NOTE. RDI uses Dow Corning’s silicone lube model number 111 but any
type of silicone O-ring lube can be used.
CAUTION. Apply a very thin coat of silicone lube on the O-ring. Using
too much silicone lube on the O-ring can be more harmful than using no O-
ring lube at all.