Sentinel V SC and RT Operation Manual
September
2017
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 103
9. Let the end-cap hang from the lanyard to the side of the ADCP. The lanyard protects the internal
I/O cable from being pulled too far away from the Sentinel V ADCP.
Removing the Transducer Head Assembly
Normal maintenance does not require removing the transducer head
.
Use the following
procedures only if directed to do so by TRDI Field Service personnel.
Sentinel V ADCPs contain Electro Static Sensitive Devices. Take accepted ESD prevention
measures before opening the transducer head.
If the transducer assembly is removed, replace both the desiccant and O-ring.
For access to the Sentinel V internal battery, remove the end-cap assembly (see End-Cap
To remove the transducer assembly from the housing:
1. Dry the outside of the Sentinel V ADCP.
2. Disconnect the I/O cable and install the dummy plug (for systems with an end-cap connector).
3. Lay the Sentinel V ADCP on its side on a soft pad.
4. Inspect the transducer bolts for any signs of damage such as bending, stretched bolts, crushed or
deformed housing captive nuts, etc. These signs may indicate that there is internal pressure inside
the system.
5. Using a 4mm hex key, loosen each of the M5 captured bolts (counterclockwise) until the O-ring
seal is released.
6. Allow the system the opportunity to vent while the bolts are loose.
To avoid any possible injury ALWAYS loosen the four end-cap bolts equally to allow any
internal pressure to be vented from the system
.
7. Once any possible over-pressure has been released, completely loosen the four M5 retaining bolts.
The transducer hardware will stay attached to the transducer assembly.
8. With an ESD ground-strap on, carefully lift the transducer assembly straight up and away from
the housing until the internal I/O cable connector jack is accessible.
Only lift the transducer assembly enough so it can be disconnected the internal I/O cable.
There is no lanyard on the transducer side to protect the internal cable from being
damaged.
9. Gently pull the internal I/O cable connector to release it from the jack. Set the transducer head
assembly (transducer face down) on a soft pad.
