Sea-Bird Electronics SBE 38 Manual do Utilizador descarregar pdf (Página 46)

Section 6: Routine Maintenance and Calibration SBE 45

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

/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

UTION:

• 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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