Section 6: Routine Maintenance and Calibration
SBE 45
37
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
1
/
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
42
Содержание SBE 45 MicroTSG
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Страница 98: ...CALIBRATION SHEETS SBE 45 Temperature Calibration S N 0402 1 SBE 45 Conductivity Calibration S N 0402 2 95 ...
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