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8 .2 MAINTENACE AND STORAGE
This section describes the proper procedures for care, maintenance and storage of the ProOBOD probe.
Do not attempt to access the probe motor assembly or open the probe body. Doing so will void any remaining warranty. The probe
body should only be opened by a YSI Authorized Service Center.
8 .2 .1 SENSOR MAINTENANCE - DISSOlVED OxYGEN
8.2.1.1
Cleaning the OBOD Sensor Cap
The Sensor Cap should be kept clean since some types of fouling may consume or produce 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. Do not
use a coarse towel or cloth or organic solvents to clean the Sensor Cap. Using a coarse towel or 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. If the sensor cap is damaged, it must be replaced.
8.2.1.2 OBOD Sensor Cap Replacement
The frequency of replacing the sensor cap is dependent on use. for example, when the probe is powered on for approximately 4 hours per day,
5 days a week, the sensor cap will need to be replaced about once per year. If the probe is powered on more than this, the sensor cap will
need to be replaced more often. To extend the sensor cap's usable life, turn the instrument off when not in use. This could mean turning the
instrument off over night, but not in between readings. The sensor cap will also need to be replaced if it is damaged or cracked.
When replacing a Sensor Cap, the Sensor Cap Coefficients must be manually updated in the ProODO instrument. The instruction sheet shipped
with the replacement OBOD sensor cap includes the calibration coefficients that are specific to your Sensor Cap.
Be sure to save the OBOD Sensor Cap instruction sheet in case you need to re-enter the calibration coefficients.
The replacement OBOD Sensor Cap is shipped in a humidified container and the package should not be opened until the cap is needed.
Once the sensor cap has been installed on the OBOD probe as described, it is important to keep the sensor in a 100% humid environment.
Therefore, the Pro0BOD sensor should be stored either with the clear cap and moist sponge on, in a BOD bottle that contains a small amount of
clean water (approximately 40 ml), or in a BOD bottle that is filled with clean water so the sensor cap is immersed in water. See Sensor Storage
for more information. If the sensor dries out, refer to the Rehydration procedure in this manual for instructions on how to recondition the sensor
cap.
Refer to Figure 35 below when following instructions for replacing the sensor cap.
NOTE
NOTE
