YSI ProODO User Manual

Page 21

Inspect the o-ring on the probe for damage. If there is any indication of

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

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

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

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

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

humidified air in the calibration sleeve.

Follow the procedures below for configuring the ProODO instrument for

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

Probe

, highlight DO, and press enter.

Highlight

Sensor Cap and press enter.

Highlight

Sensor Cap Coefficients and

press enter.

Highlight each coefficient in turn (K1

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

entered, highlight Update Sensor Cap

Coefficients and press the Enter.

A message will appear warning that you

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.