Sea-Bird Electronics SBE 45 MicroTSG, User Manual, Page: 46 / 143

Section 6: Routine Maintenance and Calibration SBE 45
38
Step 3: Flush Inside of Conductivity Cell
A. Remove the external plumbing connecting the seawater intake and drain
lines to the MicroTSG.
B. Clean the inside of the conductivity cell with a series of slow back flushes
into the
OUT port (reverse of the normal operation flow). Collect the
drainage in a bucket held below the open housing:
•
Refer to Application Note 2D: Instructions for Care and Cleaning
of Conductivity Cells for conductivity cell cleaning materials and
concentrations.
•
The Active Use (after each cast) section of the application note is not
applicable to the MicroTSG.
C. If the MicroTSG is being stored, gently blow-dry the conductivity cell
and flushing chamber.
Do not use compressed air , which typically
contains oil vapor.
D. Reinstall the external plumbing connecting the seawater intake and drain
lines to the MicroTSG.
Step 4: Clean Bottom Plate Assembly
A. Remove the O-ring on the bottom plate. Put the O-ring aside, being
careful to protect it from damage or contamination.
B. Flush the anti-foulant device cup on the bottom plate with fresh water, to
remove any debris or fine deposits. See
Replacing Anti-Foulant Device
for details on touching or handling the AF24173 Anti-Foulant Device.
C. Rinse the bottom plate with fresh water.
D. Remove water from the O-ring and the bottom plate with a lint-free cloth
or tissue.
E. Inspect the O-ring and mating surfaces for dirt, nicks, and cuts. Clean as
necessary. Apply a light coat of O-ring lubricant (Parker Super O Lube) to
the O-ring and mating surfaces.
F. Replace the O-ring on the bottom plate.
Step 5: Reinstall Bottom Plate
A. Align the bottom plate with the housing body, ensuring the end of the
anti-foulant device cup is aligned with the conductivity cell. Slowly
position the bottom plate on the housing.
B. Re-secure the bottom plate to the housing body with the six 1 /
4
-inch
socket head screws, lock washers, and flat washers.
C. Reinstall the drain plug in the bottom plate.
If the data still looks incorrect after cleaning, it may be caused by:
•
a problem with the electrical connections
•
a problem with the PCB
•
internal fouling in the conductivity cell that was not removed by flushing
•
sensors that need to be recalibrated
CAUTION:
•
If you remove sensors and
electronics from the housing to
troubleshoot,
avoid getting
anything on the PCB , which can
be damaged by water or other
materials. See
Appendix II:
Electronics Disassembly/
Reassembly
.
•
Do not put any object inside the
conductivity cell to clean it.
Return the MicroTSG to Sea-Bird
for internal cleaning and
recalibration.
Flush through anti-foulant device cup
O-ring
Note:
Early versions of the SBE 45 had a
rectangular o-ring in addition to the
round o-ring on the bottom plate; see
the photo in
Replacing Anti-Foulant
Device (SBE 45) .
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