User Manual

<7. COMMISSIONING OF SC (Conductivity)>
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IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
NOTE
The temperature compensation is not performed around zero. In this case, a warning may be
issued.
7.1.5 Calibration settings
Thescreenowdiffersdependingonthecombinationofobjectstobemeasured.
l Air adjust limit
Generally,aircalibrationisnotrequired.Toavoidtheeffectsofthecableonthemeasurementof
lower conductivities such as pure water, a “zero” calibration with a dry sensor may be done.
Whenusinga4-electrodesensor,additionalconnectionsarerequired.Temporarilyinterconnect
terminals13&14witheachotherand15&16witheachotherbeforemakingtheadjustment.
Thisisnecessarytoeliminatethecapacitiveinuenceofthecables.Thelinksshouldberemoved
after this step is completed.
Asthecalibrationisperformedinair,theresistivityisinnite(openconnection).Higher
conductivity values than the air adjust limit indicate that the cell is not in air or is still wet. To
prevent wrong air calibrations, a limit must be given here.
l c.c. high
Highlimitofthecellconstantexpressedasa%ofthenominalvalue.Duringcalibrationthisvalue
is used to check if the calibrated cell constant remains within reasonable limits.
l c.c. low
Lowlimitofthecellconstantexpressedasa%ofthenominalvalue.Duringcalibrationthisvalue
is used to check if the calibrated cell constant remains within reasonable limits.
l Step Range
Set the range over which the stability of a measured value is checked. If variations of a measured
value over the stabilization time are within this set value, the measured value is judged to have
stabilized.
l Stabilization time
Duringcalibration,thestabilityofthemeasurementisconstantlymonitored.Whenvariationsof
the value are within a value set in Step Range over this stabilization time set here, the value is
regarded as being stable. If the value does not stabilize within 10 minutes, calibration is aborted.
l Calibration interval
Settheintervalinwhichanewcalibrationmusttakeplace.Iftheintervalsethereisexceeded,
theinstrumentwillbenotiedaccordingtothesettingin“Calib.timeexceeded”intheerror
conguration.
7.1.6 Concentration
The “Concentration” can be set only when “Conduct. + Concentr.” or “Concentration” is selected
for the Measurement in the Measurement setup menu.
The corresponding concentration given by a measured conductivity can be shown on the Main
display or the Home display.
SC
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