YSI ProOBOD - Manual (Page 10)

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sensOr stOrage
SHORT-TERM STORAGE
When the ProOBOD is not in use, it MUST BE STORED IN A MOIST
ENVIRONMENT, i.e., the sensor either immersed in water or in water-saturated
air. If the sensor cap is allowed to dry out by exposure to dry air, it is likely
to drift slightly at the beginning of its next use unless it is rehydrated. If this
occurs, follow the rehydrating instructions in this manual.
For short-term storage (<30 days), place the probe in a BOD bottle that contains
a small amount of clean water (approximately 40 ml). This will provide a 100%
water-saturated air environment.
LONG-TERM STORAGE
For long-term storage (>30 days), remove the batteries from the instrument.
Moisten the sponge in the clear protective plastic cap that was originally provided
with the probe with clean water. Place the clear cap over the sensor with the
sensor cap installed. Inspect the sponge every 30 days to make sure it is still
moist. If you no longer have the clear protective cap, place the probe in a BOD
bottle that contains a small amount of clean water (approximately 40 ml).
Alternatively, you can place the sensor with sensor cap installed directly in water
in a BOD bottle, making sure that the water does not evaporate over time.
Recommended Long-term Storage ambient temperature: -5 to 50°C (23 to 122°F)
T R O U B L E S H O O T I N G
DissOlveD Oxygen reaDings
Erroneous dissolved oxygen readings typically indicate a need to clean the sensor
cap, replace the sensor cap, and/or recalibrate the instrument. First, verify the
sensor is properly setup in the Probe menu. Next, clean the sensor cap following
the instructions in the Maintenance and Storage section of this manual and
then perform a calibration. If erroneous readings persist, follow the steps on
the following page to inspect the sensor cap for damage and then attempt to
recalibrate the instrument. If the problem continues, try to rehydrate the sensor
cap and then recalibrate. If you are still getting erroneous dissolved oxygen
readings, try replacing the sensor cap and then recalibrate. If the erroneous
readings continue, contact YSI Technical Support to help determine the next
step.
INSPECTING THE SENSOR CAP FOR DAMAGE
Caution: Avoid touching the sensing end of the sensor
cap during the following maintenance procedures.
If DO measurements seem to be in error or are jumpy, remove the sensor cap
from the sensor by grasping the probe body with one hand and then rotating the
sensor cap counterclockwise until it is completely free. Do not use any tools for
the removal of the cap.
Inspect the sensor cap assembly for any cracks or damage. If damage has
occurred, contact YSI Customer Service to order a replacement sensor cap (YSI
item number 626458).
Inspect the o-ring on the probe for damage. If there is any indication of damage,
carefully remove the o-ring and contact YSI Technical Support to obtain a new
o-ring and/or gasket. Avoid using tools to remove the o-ring as damage to the
sealing surfaces could result.
Before reinstalling the sensor cap, make sure that the cavity is completely clean
and dry before proceeding with the installation. If water is found, dry the cavity
with lens tissue. Finally, clean and dry the clear optical DO sensor window on
the end of the sensor with a lens tissue.
After reinstalling the sensor cap, perform a calibration and then reevaluate
the quality of the dissolved oxygen measurements. If problems persist, try
rehydrating or replacing the sensor cap.
help
While using of the ProODO instrument, press the Question key from any
screen to view helpful messages directly on the display.
errOr/statUs messages
If readings for temperature or dissolved oxygen are over or under range, you
will see a series of +++++ or ----- respectively and an error message along the
bottom of the display. A series of ????? indicates that a parameter, for example
DO mg/L, cannot be calculated. This could be caused by a connection issue
between the cable and instrument. The following are some of the potential error
messages:
u