Sea-Bird Electronics SBE 38 Manual do Utilizador descarregar pdf (Página 45)

Section 6: Routine Maintenance and Calibration SBE 45

Section 6: Routine Maintenance

and Calibration

This section reviews corrosion precautions, conductivity cell cleaning and

storage, replacement of the Anti-Foulant Device, and sensor calibration. The

accuracy of the MicroTSG is sustained by the care and calibration of the

sensors and by establishing proper handling practices.

Corrosion Precautions

All hardware exposed to seawater is titanium; the housing is plastic. No

corrosion precautions are required. The MicroTSG should be cleaned after use

and prior to storage, as described in Cleaning and Storage.

Cleaning and Storage

Clean the MicroTSG and conductivity cell:

• Monthly (during sustained use)

• Before periods of non-use – If the cell is not rinsed between usage, salt

crystals may form on the platinized electrode surfaces. When the

instrument is used next, sensor accuracy may be temporarily affected until

these crystals dissolve.

• If the data looks incorrect –

¾ Unusually noisy data may be caused by debris going through the cell.

¾ Unusually smooth data may be caused by a blockage in the flow path

or in the cell.

¾ Shifted data may be caused by fouling inside the cell.

Follow this cleaning procedure:

Step 1: Clean Out Drain

A. Keeping the MicroTSG in an upright position, remove the drain plug from

the housing’s bottom plate.

B. Allow any water to drain out and remove any sediment or debris from

the drain.

Step 2: Inspect and Clean Flushing Chamber

A. Remove the bottom plate:

i. Remove the six

/4-inch socket head screws, lock washers, and flat

washers securing the plate to the housing body. Hold the bottom plate

as you remove the hardware, to prevent the plate from falling.

ii. Pull the bottom plate straight down from the housing body, being

careful not to damage the conductivity cell, which sits in the housing.

B. Use a flashlight to inspect the flushing chamber and conductivity cell for

debris or fine deposits. If this is a routine monthly maintenance, and there

is no evidence of debris or fine deposits, proceed to Step 4: Clean Bottom

Plate Assembly.

C. Gently spray fresh water up into the chamber to remove any fine deposits

inside the housing. Be careful not to hit the conductivity cell with the

spray hose.

CAUTION:

The MicroTSG’s conductivity cell is

shipped dry to prevent freezing in

shipping.

Do not store the

MicroTSG with water in the

conductivity cell. Freezing

temperatures (for example, in Arctic

environments or during air shipment)

can break the cell if it is full of water.

CAUTION:

• Do not put a brush or any object

inside the cell.

• Do not spray any solutions

directly into the open end of

the cell.

If fouling remains in the conductivity

cell after these procedures, return the

MicroTSG to Sea-Bird for internal

cleaning and recalibration.

Drain

plug

Screw

(typical)

Bottom

plate

Flushing

chamber

Plastic cap on

conductivity

cell

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