YSI ProODO - Manual (Page 21)

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Inspect the o-ring on the probe for damage. If there is any indication of 2.
damage, carefully remove the o-ring and replace it with the new o-ring
included with the replacement sensor cap. Do not use any tools to remove
the o-ring.
Ensure that the o-ring installed on the probe is clean. If necessary, wipe 3.
clean with a lint free cloth or replace the o-ring as described in the previous
step.
Locate the o-ring lubricant included with the new sensor cap. Apply a thin 4.
coat of o-ring lubricant to the installed o-ring. After application, there
should be a thin coat of o-ring lubricant on the o-ring only. Remove any
excess o-ring lubricant from the o-ring and/or probe with a lens cleaning
tissue.
Remove the new sensor cap from its hydrated container and dry the inside 5.
cavity of the sensor cap with lens cleaning tissue. Make sure that the cavity
is completely dry before proceeding with the installation. Next, clean
the clear surface of the sensor on the end of the probe with lens cleaning
tissue.
Using clockwise motion, thread the new sensor cap onto the probe assembly 6.
until it is finger-tight. The o-ring should be compressed between the sensor
cap and probe. Do not over-tighten the sensor cap and do not use any tools
for the installation process.
After installing the new sensor cap, store the sensor in either water or in 7.
humidified air in the calibration sleeve.
Follow the procedures below for configuring the ProODO instrument for 8.
the new Sensor Cap.
CONFIGURING PROODO INSTRUMENT FOR NEW SENSOR CAP
After installing a new Sensor Cap, connect the probe/cable assembly to the
ProODO instrument and turn the instrument on. Locate the Calibration Code
Label at the top of the instruction sheet and note the six numbers which are
listed as K1 through K5 and KC. These six numbers contain the calibration
code for this particular sensor cap. Follow the instructions below to enter the
new calibration coefficients into your existing ODO instrument.
Press the 1. Probe , highlight DO, and press enter.
Highlight 2. Sensor Cap and press enter.
Highlight 3. Sensor Cap Coefficients and
press enter.
Highlight each coefficient in turn (K1 4.
through KC) and use the numeric entry
screen to enter the corresponding new
coefficient from the Calibration Code
Label. Press Enter after each entry and
then proceed to the next K selection.
After all the new coefficients have been 5.
entered, highlight Update Sensor Cap
Coefficients and press the Enter.
A message will appear warning that you 6.
will be overwriting the current sensor cap coefficients and you should
confirm that you wish to carry out this action. Highlight Yes and press
enter to confirm the new coefficients.
After updating the Coefficients, the Serial # in the Sensor Cap menu will be
updated automatically based on your entries. The Temperature Coefficient
listed in the Sensor Cap menu is programmed into the sensor at the factory and
should not be modified unless instructed by YSI Technical Support.
If errors are made in entering the Sensor Cap Coefficients, the instrument will
block the update and an error message will appear on the display. If you see
this error message, re-enter the coefficients and check them carefully for correct
transcription from the Calibration Code Label prior to selecting Update Sensor
Cap Coefficients. If you continue to get an error message after several entry
attempts, contact YSI Technical Support for assistance.
After entering the new Sensor Cap coefficients, perform a 1-point DO
calibration.
REHYDRATING THE SENSOR CAP
The Sensor Cap must remain in a moist environment; see Sensor Storage for
storage recommendations. If you inadvertently leave your sensor exposed to
ambient air for a period of more than approximately 8 hours it may dry out. If
the sensor cap is allowed to dry out, it is likely to drift slightly at the beginning
of your next study unless it is rehydrated. If the cap dries out, you can rehydrate
it by soaking the probe tip with the sensor cap installed in warm tap water for 24
hours. After rehydration is complete, recalibrate and be sure to store the probe
in a moist environment.