User`s manual

Manual revision 016 Appendix II: Electronics Disassembly/Reassembly SBE 49
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Appendix II:
Electronics Disassembly/Reassembly
Disassembly
1. Remove the connector end cap:
A. Wipe the outside of the end cap and housing dry, being careful to
remove any water at the seam between them.
B. Remove the 2 Phillips-head screws holding the connector end cap to
the housing.
Note: For plastic-housing FastCATs shipped or retrofitted after July
2008, these are hex screws instead of Phillips-head screws. Sea-Bird
ships the FastCAT with a 9/64-inch Allen wrench for these screws.
C. Using straight screwdrivers in the slots, carefully pry off the end cap.
Note that the end cap and electronics are electrically connected with
edge connectors, and the end cap will not twist off.
D. Remove any water from the O-rings and mating surfaces inside the
housing with a lint-free cloth or tissue.
E. Be careful to protect the O-rings from damage or contamination.
2. Remove the housing:
A. Wipe the outside of the sensor end cap and housing dry, being careful
to remove any water at the seam between them.
B. Remove the 3 Phillips-head screws holding the housing to the sensor
end cap.
Note: For plastic-housing FastCATs shipped or retrofitted after July
2008, these are hex screws instead of Phillips-head screws. Sea-Bird
ships the FastCAT with a 9/64-inch Allen wrench for these screws.
C. Slide the end cap and attached electronics out of the housing.
D. Remove any water from the O-rings and mating surfaces inside the
housing with a lint-free cloth or tissue.
E. Be careful to protect the O-rings from damage or contamination.
Reassembly
1. Remove any water from the end cap O-rings and mating surfaces in the
housing with a lint-free cloth or tissue. Inspect the O-rings and mating
surfaces for dirt, nicks, and cuts. Clean or replace as necessary. Apply a
light coat of O-ring lubricant (Parker Super O Lube) to the O-rings and
mating surfaces.
2. Reinstall the housing:
A. Carefully fit the end cap and electronics into the housing until the
O-rings are fully seated.
B. Reinstall the 3 screws to secure the housing to the sensor end cap.
3. Reinstall the connector end cap:
A. Line up the alignment pin with the notch in the end cap. Verify the
pin/notch and screw holes are properly aligned.
B. Carefully fit the end cap into the housing until the edge connectors
mate and the O-rings are fully seated.
C. Reinstall the 2 screws to secure the housing to the end cap.
4. No user-programmable setup parameters should have been affected by the
electronics disassembly (send DS to verify).
Note:
Before delivery, a desiccant package is
placed in the housing, and the
electronics chamber is filled with dry
Argon gas. These measures help
prevent condensation. To ensure
proper functioning:
1. Install a new desiccant bag each
time you open the housing. If a new
bag is not available, see Application
Note 71: Desiccant Use and
Regeneration (drying).
2. If possible, dry gas backfill each
time you open the housing. If you
cannot, wait at least 24 hours before
redeploying, to allow the desiccant
to remove any moisture from the
housing.
Remove screw
(2 places)
Pry off end cap using
screwdriver in slots
Remove screw (3 places)
CAUTION:
See Section 5: Routine Maintenance
and Calibration for handling
instructions for the plastic housing.