User Manual

<15. OPERATION OF SENCOM pH/ORP>
15-9
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
Day
Value
Lower limit
Upper limit
Current
date
Projected
maintenance date
F0310.ai
Figure 15.7
The status shows the certainty of the projected maintenance date in terms of the correlation
coefcientR.Tables15.1and15.2showrespectivedisplaypatterns.
Table 15.1 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 15.2 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 Projected replacement
The projected replacement function predicts the date when the sensor will need replacing for
maintaining the measurement accuracy, based on the pH zero and pH slope on each calibration,
and reference impedance (input-2 impedance) after each calibration. The projected replacement
date is predicted based on these parameters stored upon calibration, and displayed the same as
that of projected maintenance. For details, see the description about the projected maintenance.
Since three parameters (pH zero, pH slope, and input-2 impedance after calibration) are used for
this projection, the nearest coming day is selected as the projected replacement date from the
extrapolatedlineofthevaluesobtainedbytheleastsquaresmethod.
n SENCOM sensor status
ThestatusoftheSENCOMsensorisdisplayed.
Max temp. exposed
Displaysthemaximumtemperature,whichisautomaticallyupdatedeverytimeahigher
temperature is measured.
High pH total time/Low pH total time
DisplaysthetotaltimeduringwhichthepHvalueremainsabovetheupperpHlimitorbelowthe
lower pH limit.
Upto10years(87600hours)canbecounted,afterwhichthetimeisnolongerupdated.Forthe
setting of the parameters, see Section 16.2.7.
Sterilization
Displaysthenumberoftimesthetemperatureremainsabovethepresetvalueforatleastthe
prescribed time period (min.). For the setting of these parameters, see Section 16.2.7.
Figure15.8showsanexampleofsterilization.
15
SENCOM