User Manual

<4. COMMISSIONING OF pH/ORP>
4-7
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
l Auto correct (Zero, Slope)
Thisfunctioncalculatescalibrationcoefcientsfromthetransitionofpastcalibrationdata(zero,
slope)andcompensatespHvalueusingthesecalibrationcoefcientsafterthelatestcalibration.
Thedefaultsettingis“Disable.”Tomakethefunctioneffective,select“Enable.”
Time
Calibration
Zero, Slope
a
b
c
d
a: Actual change
b: Zero and slope calculated from
the calibration data
c: Zero and slope calculated from
the calibration data and shifted
using the latest calibration data
d: Data from calibration
Figure 4.3 Auto correct
n
ORP settings
l Limits and timing
Zero High/Low
Zero(aspot)highandlowlimits.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, resulting in higher accuracy. The default values should be adjusted to
suit the application and the “users” criterion.
Slope High/Low
Slope(sensitivity)highandlowlimits.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, resulting in higher accuracy. The default values should be
adjusted to suit the application and the “users” criterion.
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 setpoint, the measured value is judged to have
stabilized.
Stabilization time
Duringcalibration,thestabilityoftheORPvalueisconstantlymonitored.Whenvariationsofthe
ORP value are within a value set in Step Range over this stabilization time set here, the value
is regarded as being stable. If the ORP value does not stabilize within 10 minutes, calibration is
aborted.
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.
PH
4