User Manual

<13. COMMISSIONING OF DO (Dissolved Oxygen)>
13-4
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
13.2.6 Calibration settings
In “Calibration settings,” set the high and low limits of Zero/Slope and set up parameters relating
to stabilization performed during calibration.
l Limits and timing
Zero High/Low
SetthehighandlowlimitsofZero.Duringcalibration,itischeckedwhetherthenewzero
exceedsthesehighandlowlimits.Narrowingthebandwillpreventbadcalibrationprocedures
and calibration of bad sensors, which results in higher accuracy. The default values should be
adjusted to suit the application and the “users” criterion.
Slope High/Low
SetthehighandlowlimitsofSlope.Duringcalibration,itischeckedwhetherthenewslope
exceedsthesehighandlowlimits.Narrowingthebandwillpreventbadcalibrationprocedures
and calibration of bad sensors, which results in higher accuracy. The default values should be
adjusted to suit the application and the “users” criterion.
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 60 minutes, calibration is aborted.
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.
Calibr. 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.
l Zero/Slope
You can enter zero and slope values directly.
Zero current values can be set only when the setting of “Zero Calibration” is “Enabled.”
l Pressure comp. (Cal.)
You can enter the pressure level directly.
l Zero Calibration
Ifzerocalibrationisrequired,select“Enabled”forthisparameter.Thedefaultvalueis“Disabled.”
When this feature is enabled, “Zero current values” can be set in zero settings.
NOTE
When the zero calibration is set to “disabled” after performing the calibration, the result of the
calibration turns invalid (default).