idronaut Ocean Seven 304Plus Operator's Manual page 79

APPENDIX H – CTD MAINTENANCE
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H.3.2 Temperature Sensor
The temperature sensor is almost maintenance free; however, we suggest cleaning it once a year with
sandpaper (3M, 400 grid) - which is included in the Oxygen Maintenance Kit - to remove carbonate
which, if present, will greatly increase its time constant.
H.3.3 Conductivity Cell
The IDRONAUT conductivity cell has the advantage that it can be used both in clean and unclean
water without fear of contamination. When the conductivity cell is not in use, it is kept dry.
Should cell contamination occur, it can be easily cleaned (even with up to 30% hydrochloric acid)
without affecting the conductivity cell performance or requiring re-calibration. To clean the
conductivity cell, use common cotton buds. The cleaning can be done using the Idronaut
"Conductivity Sensor Cleaning Solution" or a non-ionic detergent like Triton X-100. At the end of
cleaning, rinse very well the conductivity cell with tap, deionized or distilled water.
H.3.4 Oxygen Sensor
At the end of the OCEAN SEVEN 3xx general cleaning, remove the oxygen sensor cap, clean and
wash it again if needed, then refill the cap with oxygen electrolyte. If mechanically damaged or
stressed, replace the green measuring membrane too.
IDRONAUT – Brugherio (MB) OCEAN SEVEN 304Plus CTD
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12-2015