SonTek/YSI
62
ADVField Operation Manual (September 1, 2001)
4.4.4. Changing Batteries in the ADVField Round Underwater Canister
These instructions apply to the ADVField in the round un-
derwater canister with internal batteries. Figure 15 shows
the layout of the underwater canister with internal batteries.
To remove the battery packs:
1. Vent any differential pressure using the vent screw in
the center of the end cap. After venting, but before
opening the canister, tighten the vent screw.
2. Open the underwater canister, remove the end cap as-
sembly, and disconnect the battery cables.
3. Remove the retaining ring by placing a large flat-blade
screwdriver against the notched end of the ring and
turning the screwdriver 90°. Insert a second screwdriver
or small tool between the exposed edge of the ring and
canister. With the ring held open, it can be lifted with
either your fingers or using a small flat-blade screw-
driver. Once started, the rest of the ring can be easily
removed from the slot using a spiral motion. Lift the
ring out of the canister taking care not to damage the o-
ring surfaces or threads.
4. Remove the battery cover and pads, and lift out the bat-
tery packs. SonTek packs have straps attached to them
for easy removal; if these are not present, tilt the canis-
ter to slide out the packs.
To install new batteries
:
1. Place one foam pad on the bottom of the case.
2. Install the two packs in the case. Align the cables from the two packs on the same side of the
canister.
3. Place several foam pads on top of the battery packs. The number of pads needed will vary, as
the dimensions of the battery packs can vary (particularly between alkaline and lithium).
4. Install the retaining plate on top of the foam pads, running the battery cables through the larg-
est hole in the plate. There should be enough pads so that the plate requires moderate com-
pression to give access to the retaining ring slot.
5. Install the retaining ring, taking care to avoid damage to the o-ring surfaces and threads.
6. Connect the battery cables to the wiring harness from the electronics and close the system.
7. When the system has been completely closed, be sure to establish communication with the
ADV and place it in sleep mode to avoid draining the batteries.
8. Ensure the vent screw is tightened securely.
0
0
Pro
e
Connector
Power and
Communicatio
Connector
Ve n t
Screw
Battery
Packs
Foam
Pads
Foam
Pad
Retaining
Plate
Retaining
Ring
Figure 15 - ADVField with
Internal Batteries
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