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Figure 68 Conductivity/Temperature
long-term storage
Dissolved Oxygen Sensor
ODO sensor caps are warranted for 1 year but have a typical working life of 18 to 24 months. The ODO Extended
Warranty Sensor Cap (627180) that comes pre-installed on ODO/CT cable assemblies features a 2 year warranty.
As the ODO sensor caps ages, large scratches in the paint/dye layer and changes in the dye layer can reduce
measurement stability and response time.
Periodically inspect the sensor cap for damage and large scratches in the paint/dye layer. Replace the cap when
readings become unstable and cleaning the cap and DO recalibration do not remedy the symptoms.
Cleaning the Sensor Cap
The sensor cap should be kept clean since some types of fouling may consume oxygen which could affect the
dissolved oxygen measurements. To clean the sensor cap, gently wipe away any fouling with a lens cleaning tissue that
has been moistened with water.
NOTICE: Do not use organic solvents to clean the sensor cap. Using an organic solvent to clean the sensor cap
may cause permanent damage to the cap. For example, alcohol will dissolve the outer paint layer and
other organic solvents will likely dissolve the dye in the cap.
ODO Sensor Cap Replacement
The sensor cap should be replaced about once per year for those with a 1 year warranty, but the cap may last longer. It
should also be replaced if it is cracked or damaged. The instruction sheet shipped with the replacement ODO sensor
cap includes the calibration coefficients specific to your sensor cap.
The instructions for replacing the sensor cap on ProDSS ODO sensors (626900) are different than the instructions
for integral (i.e. built-in) ODO sensors on ODO/CT (627150) and ProODO (626250) cable assemblies, so ensure the
correct directions are being followed when replacing the sensor cap.
NOTE: Make sure to save the ODO sensor cap instruction sheet in case you need to reload the calibration
coefficients.
NOTE: The replacement ODO sensor cap is shipped in a humidified container and the package should not be
opened until immediately before sensor cap replacement.
Once the sensor cap has been installed on the ODO sensor, it is important to keep the sensor in a 100% humid
environment. If the sensor dries out, refer to the rehydration procedure
Conductivity/Temperature Sensor Long-Term Storage
The Conductivity/Temperature sensor can be stored dry or wet. For
ProDSS 4 port cable assemblies, the sensor can be installed on the
bulkhead or detached
(Figure
Maintenance and Storage
68).
("ODO sensor rehydration on page
66).
63
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