Specifications
Channel Master Operation Manual
P/N 95B-6001-00 (February 2006) page 37
8.11 Pressure Sensor Maintenance
In order to read the water pressure, water must be able to flow through the
copper screw on the pressure sensor. The tiny hole in the copper screw may
at times be blocked. Use the following procedure and Figure 16, page 24 to
clean the screw.
a. Place the Channel Master on its’ housing end. Use a soft pad to protect
the Channel Master.
b. Use a straight-slot screwdriver to remove the copper screw.
c. Gently clean out the hole in the copper screw with a needle. If the hole
becomes enlarged or the screw is corroded, replace the screw. A re-
placement copper screw is included in the spare parts kit (part number
817-1067-00).
d. Install the copper screw. Tighten the screw “finger tight” (0.226 N-m,
2 lbf-in). Do not over tighten the screw or you may strip the threads on
the plastic cover disc. If this happens, return the Channel Master to RDI
for repair.
CAUTION.
The pressure sensor is filled with silicone oil. Never poke a needle or other
object through the copper screw while the screw is installed over the
pressure sensor. You will perforate the sensor, causing it to fail.
Do not remove the cover disc or attempt to clean the surface of the
pressure sensor. The diaphragm is very thin and easy to damage.
Do not remove the pressure sensor. It is not field replaceable.
8.11.1 Pressure Sensor Cavity Oil Fill
The pressure sensor cavity needs to be filled with oil before deployment to
deal with both trapped air and long-term reliability of the pressure sensor.
The oil to be used is Dow Corning Q7-9120 Silicone fluid, 12,500 CST.
This fluid is supplied with the Channel Master in the spare parts kit. The
filling of the cavity can be completed any time before system installation
however care should be taken to keep the Channel Master from high tem-
perature during this time.
NOTE. The pressure sensor cavity is not filled with oil when shipped. This
must be done before deploying the Channel Master.
Use the following procedure and Figure 16, page 24 and Figure 20, page 38
to fill the pressure sensor with oil.