User Manual

<9. OPERATION OF ISC (Induvtive Conductivity)>
9-8
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
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.
n Projected replacement
The projected maintenance function predicts the date when the sensor unit will need cleaning or
recalibrating for maintaining measurement accuracy. The function checks the cleanliness of the
sensor by monitoring the cell constant after calibration. Clean the sensor before the predicted
date.
The function predicts the dates when the cell constant will cross the upper or lower limits and
displays the predicted date with the status (the status is displayed in parentheses).
As shown in Figure 9.6, the date is predicted based on the intersection point of the upper or lower
limitsandtheextrapolatedlineofthevaluesobtainedbytheleastsquaresmethod.
Day
Value
Lower limit
Upper limit
Current
date
Projected
maintenance date
F0310.ai
Figure 9.6
The status shows the certainty of the projected maintenance date in terms of the correlation
coefcientR.Tables9.1and9.2showrespectivedisplaypatterns.
Table 9.1 Display pattern of the projected maintenance date
Projected date - - 0-1 month 1-3 months 3-6 months 6-12 months Over 1 year
--: cannotbepredictableduetoinsufcientdata
Table 9.2 Display pattern of the status
Status
(- - - - -)
(R < 0.50)
(Poor)
(0.50≤R<0.70)
(Reasonable)
(0.70≤R<0.85)
(Excellent)
(0.85≤R<1.00)
n ISC module (sensor)
With this screen, you can check the module productions number and software revision of the
installed module.
n HOUSING ASSY
With this screen, you can check the module productions number, software revision, and HART
device revision of the housing assembly.