YSI ProODO - Manual (Page 22)

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SENSOR MAINTENANCE - TEMPERATURE
You must keep the temperature portion of the sensor free of build up. Other
than that, the sensor requires no maintenance. A soft bristle brush, like a tooth
brush can be used to scrub the temperature sensor if needed.
sensor storaGe
SHORT-TERM STORAGE
When the ODO Sensor is not in use, it MUST BE STORED IN A MOIST
ENVIRONMENT, i.e., either in water or in water-saturated air. If the sensor
cap is allowed to dry out by exposure to ambient air, it is likely to drift slightly at
the beginning of your next study unless it is rehydrated.
For short-term storage (<30 days), moisten the sponge in the calibration/storage
sleeve with a small amount of clean water and place this over the probe with the
sensor cap installed. This will provide a 100% saturated air environment.
LONG-TERM STORAGE
For long-term storage (>30 days), remove the batteries from the instrument.
Moisten the sponge in the red protective plastic cap that was provided with the
probe and place it 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 red
protective cap, then moisten the sponge in the calibration/transport sleeve and
place this over the probe.
Alternatively, you can place the probe with sensor cap directly in a beaker or
other container of water, making sure that the water does not evaporate over
time.
Long-term Storage: -5 to 70°C (23 to 158°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
next 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 then
u
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 readings 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. Avoid using tools for the
removal of the cap if at all possible.
Inspect the sensor cap assembly for any cracks or damage. If damage has
occurred, contact YSI Customer Service to order a replacement sensor cap.
Inspect the o-ring on the probe and the gasket at the top of the threads for
damage. If there is any indication of damage, carefully remove these parts 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 dry
before proceeding with the installation. If water is found, dry the cavity with
lens cleaning tissue. Finally, clean the clear window on the end of the probe with
lens cleaning tissue.
After reinstalling the sensor cap, perform a calibration and then reevaluate the
quality of the dissolved oxygen readings. If problems persist, try rehydrating or
replacing the sensor cap.
help
During use of the ProODO instrument press Question from any screen to
view help messages directly on the display.
error/status MessaGes
If readings for a certain parameter are over range you will see a series of +++++
and if the readings are under range you will see a series of ----- plus the error
message along the bottom of the screen. If you see a series of ?????, that will
indicate that a certain parameter cannot be calculated. This could be due to a