2
Rinsing, Cleaning, and Storage Procedures
Note
: See
Cleaning Materials
below for discussion of appropriate sources /
concentrations of water, Triton X-100, bleach, and tubing.
CAUTIONS:
The conductivity cell is primarily glass, and can break if mishandled.
Use the correct size Tygon tubing; using tubing with a smaller ID will
make it difficult to remove the tubing, and the cell end may break if excessive force is used.
The correct size tubing for
use in cleaning / storing all conductivity cells produced since 1980 is 7/16" ID, 9/16" OD
. Instruments shipped prior to
1980 had smaller retaining ridges at the ends of the cell, and 3/8" ID tubing is required for these older instruments.
Do not put a brush or object (e.g., Q-Tip) inside the conductivity cell to clean it or dry it.
Touching and bending the
electrodes can change the calibration; large bends and movement of the electrodes can damage the cell.
If
an SBE 43 dissolved oxygen (DO) sensor is plumbed to the CTD
- Before soaking the conductivity cell for more
than 1 minute in Triton X-100 solution,
disconnect the tubing between the conductivity cell and DO sensor
to prevent
extended Triton contact with the DO sensor membrane (extended Triton contact can damage the membrane). See
Application Note 64
for rinsing, cleaning, and storage recommendations for the SBE 43.
IDO MicroCATs
(37-SMP-IDO, 37-SIP-IDO, 37-IMP-IDO) have an integrated dissolved oxygen sensor.
Do not follow
the rinsing, cleaning, and storage recommendations in this application note for IDO MicroCATs;
extended Triton
contact with the DO sensor membrane can damage it, and the recommended solution temperature can cause a temporary
increase in sensitivity. See
Application Note 64
for rinsing, cleaning, and storage recommendations for IDO MicroCATs.
Active Use (after each cast)
1.
Rinse: Remove the plumbing (Tygon tubing) from the exhaust end of the conductivity cell.
Flush
the cell with a
0.1%
Triton X-100
solution.
Rinse
thoroughly with
fresh, clean
water
and drain.
If not rinsed between uses, salt crystals may form on the conductivity cell platinized electrode surfaces. When the
instrument is used next, sensor accuracy may be temporarily affected until these crystals dissolve.
2.
Store: The intent of these storage recommendations is to keep contamination from aerosols and spray/wash on the ship
deck from harming the sensor’s calibration.
No danger of freezing
:
Fill
the cell with a
500 – 1000 ppm
bleach
solution, using a loop of Tygon tubing attached to
each end of the conductivity sensor to close the cell ends.
Danger of freezing
: Remove larger droplets of water by blowing through the cell.
Do not use compressed air
, which
typically contains oil vapor. Attach a loop of Tygon tubing to each end of the conductivity cell to close the cell ends.
Routine Cleaning (no visible deposits or marine growths on sensor)
1.
Agitate
a
500 – 1000 ppm
Bleach
solution warmed to 40
C through the cell in a washing action (this can be
accomplished with Tygon tubing and a syringe kit – see
Application Note 34
) for
2 minutes
.
Drain and flush
with
warm (not hot) fresh, clean water for
5 minutes
.
2.
Agitate
a
1%-2%
Triton X-100
solution warmed to 40
C through the cell many times in a washing action (this can
be accomplished with Tygon tubing and a syringe kit). Fill the cell with the solution and let it
soak
for
1 hour
.
Drain and flush
with warm (not hot) fresh, clean water for
5 minutes
.
Cleaning Severely Fouled Sensors (visible deposits or marine growths on sensor)
Repeat the
Routine Cleaning
procedure up to 5 times.
Long-Term Storage (after field use)
1.
Rinse: Remove the plumbing (Tygon tubing) from the exhaust end of the conductivity cell.
Flush
the cell with a
0.1%
Triton X-100
solution.
Rinse
thoroughly with
fresh, clean water
and drain. Remove larger droplets of water by blowing
through the cell.
Do not use compressed air
, which typically contains oil vapor.
2.
Store: Attach a loop of Tygon tubing to each end of the conductivity cell to close the cell ends and prevent contaminants
from entering the cell.
Storing the cell dry prevents the growth of any bio-organisms, thus preserving the calibration.
3.
When ready to deploy again:
Fill
the cell with a
0.1%
Triton X-100
solution for
1 hour
before deployment. Drain the
Triton X-100 solution; there is no need to rinse the cell.
Soaker tube
SBE 4 Conductivity Sensor
100
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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