User Manual

<12. OPERATION OF DO (Dissolved Oxygen)>
12-7
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
n Zero Current
=Theoffsetvalueofacalibratedsensor.Thisistheoffsetofthesensorandsensorcircuitinthe
zerooxygencondition.
n Slope
This parameter indicates the sensitivity of the sensor after calibration. It is indicated as a
percentage of the reference sensitivity based on the selection of the sensor or that has been
entered.
n Sensor Current
=Therawoutputofthesensorbeforeitiscalibratedandtemperaturecompensated.
n Available KOH
This parameter indicates the amount of available KOH remaining in the sensor. This amount
iscalculatedanddisplayedbytotalizingtheamountofKOHconsumedbydissolvedoxygen
measurements.
When replacing the solution in the sensor, calibration should be made to reset (clear) diagnostic
sensor data.
n Compensation
For compensation of measured value, salinity compensation and pressure compensation are
available. To use pressure compensation, enter the pressure level directly.
n Sensor wellness
At the Sensor wellness window, the soundness of a module is displayed. A larger number of n
in each gauge indicates that the parameter concerned is sound. A gauge is indicated for only
those parameters whose sensor wellness setting is “enabled,” while a bar (----) is displayed if the
sensor wellness setting is “disabled.”
SensorwellnesssetupcanbemadeinCommissioning→Measurementsetup→Sensordiag.
settings. For details, see section 13.2.7.
The “Reset wellness data” button can reset wellness data.
Whenasensororamembraneisexchangedorreplaced,sensorwellnessdatashouldbereset.
NOTE
When a sensor is replaced, the replacement can be recorded manually into a logbook. (Refer to
thegure12.7.)
n Last calibrated
=dateonwhichthelastsensorcalibrationwasperformed.ThedisplayedvalueoftheZeroisthe
result of this calibration. The displayed value of Slope was calibrated on this date only if the last
calibration was a 2-point calibration.
n Calibration due
=thedatewhenthecalibrationmustbedonenextaccordingtothesettingsofthecalibration
interval.ThecalibrationintervalsaresetinCommissioning→Measurementsetup→Calibration
settings→Limitsandtiming.
DO
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