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Section 5
Page 105
Cleaning and Maintaining Submerged Area/Velocity Sensors
Figure 47 Removing the Protective Cover
5.6.2 Changing the Desiccant
Your sensor contains a tube that equalizes the air pressure in the transducer
and the outside air pressure. Moisture may become trapped in this tube.
A desiccant-filled canister helps remove moisture from this tube and from the
sensor. The canister contains beads of silica gel. When the beads are blue,
they can remove moisture from the air. When they are pink, they cannot
absorb any more moisture from the air.
When the beads begin to turn pink, you must replace or rejuvenate (dry out) the
beads. You can permanently damage the sensor if the desiccant is not
maintained. Never operate the sensor without the proper desiccant.
5.6.3 Desiccant Replacement Procedure
Note: If you are rejuvenating the
beads, remove them from the
canister and heat at 100–180 °C
(212–350 °F) until the beads turn
blue again. If the beads do not turn
blue, replace them with new beads.
Do not heat the canister. It will melt.
1. Use a slight twisting motion to twist the bottom end-cap until its slots align
with the retaining clips.
2. Gently remove the end cap by grasping it and pulling it straight out.
3. Pour the desiccant beads out of the canister.
4. Remove the tubing at the top of the canister (Figure 48).
5. Remove the canister from its clip.
1. Gasket 3. Screws (#6–32 x
5
/16)
2. Protective Cover 4. Transducer
1
2
34x
4