Sentinel V SC and RT Operation Manual
September
2017
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 125
5. Lubricate the O-ring with a thin coat of silicone 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. Slip the O-ring
over the end-cap and press the O-ring into the groove.
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.
6. Use the
panel to set the date the O-ring was replaced.
Filling the Pressure Sensor Cavity with Oil
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. Use Dow Corning Q7-9120 Silicone fluid, 12,500 CST oil. A
plastic bottle with silicone oil (part number 75BK6004-00) and a syringe with 10-gauge needle are in-
cluded in the spare parts kit. The sensor cavity can be filled any time before system installation; however,
care should be taken to keep the ADCP from high temperature during this time. High temperatures may
cause the oil to leak.
Figure 63.
Filling the Pressure Sensor Cavity with Oil
The pressure sensor cavity is not filled with oil when shipped. This must be done before
deploying the Sentinel V ADCP. The Pressure sensor cavity should be checked and if needed
refilled between deployments.
To fill the pressure sensor with oil:
1. Place the Sentinel V ADCP so the pressure sensor is facing up and level. Use a soft pad or the ship-
ping case to protect the ADCP.
2. Use a straight-slot screwdriver to remove the three flat-head black nylon M3 screws on the pres-
sure sensor and then lift off the pressure sensor cover. The pressure sensor cover fits tightly and
may need to be gently pried out using the screwdriver in one of the screw holes (see Figure 64,
page 126).