Manual revision 001
Section 5: Routine Maintenance and Calibration
SBE 39
plus
-IM
77
Section 5: Routine Maintenance
and Calibration
This section reviews corrosion precautions, AA lithium cell and desiccant
replacement, O-ring maintenance, pressure sensor maintenance, and sensor
calibration. The 39
plus
-IM’s accuracy is sustained by care and calibration of
the sensors and establishing proper handling practices.
Corrosion Precautions
All exposed materials are titanium or plastic. No corrosion precautions are
required, but direct electrical connection of the 39
plus
-IM (titanium) housing
to mooring or other dissimilar metal hardware should be avoided. Rinse the
39
plus
-IM with fresh water after use and prior to storage.
Replacing AA Cells and Desiccant
Sea-Bird ships the SBE 39
plus
-IM with four Saft LS 14500 AA lithium cells
installed. Leave the cells in place when storing the 39
plus
-IM (quiescent
current is only 60 microamps). If the 39
plus
-IM is to be stored for long
periods,
replace the cells yearly to prevent cell leakage
(which could
damage the 39
plus
-IM).
Replace the desiccant
on top of the battery pack
each time you open the
housing.
There is also a desiccant bag inside the plastic cylinder that protects
the electronics; the plastic cylinder should not be removed by the customer.
Follow instructions below to replace the AA cells and desiccant. See
Shipping
Precautions
in
Section 1: Introduction
for details on shipping lithium cells.
1.
Remove the titanium end cap and electronics from the housing as follows:
A.
Wipe the outside of the end cap and housing dry, being careful to
remove any water at the seam between them.
B.
Using a wrench on the end cap’s wrench flats, unscrew the end cap.
C.
Pull the end cap and attached electronics out of the housing.
D.
Remove any water from the end cap O-rings and mating surfaces
inside the housing with a lint-free cloth or tissue.
2.
Replace the AA cells: Push each cell out of the battery holder, and install
the new cells.
3.
Install a new desiccant capsule in the slot on top of the battery pack.
CAUTION:
Before delivery, desiccant is placed in
the housing, on top of the battery pack,
and the electronics chamber is filled
with dry Argon gas. These measures
help prevent condensation.
To ensure proper functioning:
1.
Install new desiccant each time
you open the housing. Desiccant
capsule used in 39plus-IM cannot
be regenerated by heating.
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.
Wrench flat (both sides)
With external
thermistor; detail
similar
for 39
plus
-IM with
embedded thermistor
Push cell out of
holder
Desiccant capsule
