May
2015
WorkHorse H-ADCP Operation Manual
Page 52
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
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.
5. The backup O-ring (see Figure 22) is installed in addition to the 2-258 bore O-ring on the trans-
ducer head assembly for 300 kHz Narrow Beam Width systems only. Install the backup O-ring
with the cupped side facing the 2-258 bore seal O-ring.
Figure 22.
300 kHz Narrow Beam Width Backup O-Ring Detail
Housing Assembly Replacement
To replace the housing assembly:
1. Stand the H-ADCP on its end-cap.
2. Inspect, clean, and lubricate the O-ring on the housing (see
O-ring Inspection and Replacement
).
Apply a very thin coat of silicone lube on the O-ring.
TRDI recommends you use new O-rings if you are preparing for a deployment.
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.
3. Connect the internal I/O connector to the plug on the common mode choke.
4. Gently lower the transducer head/electronics assembly into the housing, aligning the mating
holes and the beam 3 number embossed on the transducer head with the beam 3 number em-
bossed on the end-cap. When mating the housing with the transducer head flange try to apply
equal pressure to all parts of the O-ring. Make sure the face O-ring remains in the retaining
groove.
Check that no wires or any other object is pinched between the transducer head assembly and
the housing. Use rubber bands to hold the wiring in place as necessary. If the O-ring is not in
the groove or if a wire or other object is pinched, the H-ADCP will flood.