11
minute to dissolve the salt. Submerge the Model 10 sensor in this water and allow it to rest for at least 30
minutes. For best accuracy, the sensor should be resting face down in the bottom of the container. (The
solution stratifies over time at rest, and the dissolved oxygen content will be closest to zero at the bottom
of the container, while slightly above zero nearer the surface.) Also make sure that no air bubbles are
trapped on the face of the sensing element during the soak. Once the sensor is stable, use the “Sensor
Calibration to a Reference” procedure described previously to set the D.O. reading to 0.00 PPM. YOU
MUST ACTUALLY PERFORM THE CAL TO REFERENCE PROCEDURE IN ZERO WATER EVEN IF
THE SENSOR READS ZERO FROM THE RUN MODE. [NOTE: If the user’s application requires a zero
that is absolutely accurate (frequent readings below 0.5 PPM), then the zero solution needed for this
procedure should be mixed 12 to 24 hours before use, and distilled water should be used in place of tap
water. Freshly mixed solution actually has a value of about 0.10 PPM, but a calm solution at rest for 12
hours will drop down very close to absolute zero.]
Once a sensor has been properly zeroed, a slope adjustment may be made. Place the sensor in a
solution of known D.O. concentration, and allow about 15 minutes to fully stabilize. Choose the sensor
slope adjustment calibration procedure as option 2 “Sensor Slope Adj” from the SENSOR SETUP menu,
and press ENTER. Press ENTER again to bypass the “!Warning! Proper Zero Required” message. The
analyzer will now read the sensor for the period of time indicated by the “dampening” parameter, and
display the result as D.O. in PPM. If this result matches the reference, simply press ENTER to exit.
Otherwise, use the arrow keys to adjust the reading to match the reference value, and then press ENTER
to store this new value.
FACTORY DEFAULT
The Factory Default parameter allows the user to restore the sensor characteristic values of zero and
slope to the original factory settings.
TEMP. UNITS
The temperature units parameter allows the user to specify Celsius or Fahrenheit for the displayed
temperature units.
DAMPENING
The dampening parameter will allow the adjustment of the amount of averaging taking place. This is
entered in the amount of time it will take to achieve a stabilized reading, in seconds. This may be useful
when using the system in a new application or trouble shooting.
SALINITY
This option allows for the correction of salts in the water. The salinity correction range is 0 to 45 ppt
with a resolution of 1 ppt.
DISPLAY MODE
This option allows the dissolved oxygen to be displayed in either PPM or %SAT.
PASSCODE
The passcode parameter will allow the operator to limit access to the sensor setup parameters. The
passcode may be set to any three-digit number.
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