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Maintenance and storage
Figure 67 ODO rehydration
ODO sensor rehydration
To prevent sensor drift, always store the ODO sensor in a wet or
water-saturated air environment. If the ODO sensor has accidentally
been left dry for longer than 8 hours, it must be rehydrated.
If rehydration is necessary, soak the ODO sensor cap in warm (room
temperature) tap water for approximately 24 hours. After the soak,
calibrate the sensor (Figure 67).
Figure 68 ODO short-term storage
ODO sensor short-term storage (less than 4 weeks)
When in regular field use, the ODO sensor should remain installed on
the bulkhead. Place approximately 0.5 in (1 cm) of any water (tap or
environmental) in the calibration cup (Figure 68).
Install the calibration cup onto the bulkhead and firmly tighten to prevent
evaporation.
Figure 69 ODO long-term storage
ODO sensor long-term storage
The ODO sensor can be left on the bulkhead or removed for long-term
storage (Figure 69).
Installed on bulkhead
Fill the calibration cup with clean water (use distilled or deionized water if
a pH sensor is not installed). Submerge the sensor in the calibration cup
then firmly tighten to prevent evaporation.
Removed from bulkhead
Remove the sensor from the bulkhead (Sensor removal on page 10).
Method 1 : Cover the sensor connector end with the plastic storage
cap. Submerge the sensing end of the sensor in a container
of clean water (use distilled or deionized water if a pH
sensor is not installed). Periodically check the level of the
water to make sure that it does not evaporate.
Method 2: Wet the sponge located in the cap originally included with
the ODO sensor, then install on sensing end of the ODO
sensor. Replace the sponge if it becomes dirty.
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