User Manual

<11. CALIBRATION OF ISC (Inductive Conductivity)>
11-4
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
NOTE
ThetemperaturecompensationshouldbesettoNaClwhenconrmingzeroduringair
calibration.
NOTE
The temperature compensation is not performed around zero. In this case, a warning may be
issued.
Notbeingwet,thesensormeasurestheconductivityofair,whichisclosetozero.Because
zero conductivity is out of the range for temperature compensation (this range is based on the
temperatureandconductivityofsolutionsandispresetto0.033μS/cmat20°C),awarningmay
be issued. This is not a device error.
Theconductivityofairiszeroanditdoesnothaveatemperaturecoefcient.Executezero
calibration regardless of the warning.
11.4 Sample
With the sensor in situ, a sample can be taken for laboratory analysis. Sample calibration records
the time and reading, and holds these in memory until the analysis has been completed. The
laboratory data can then be entered regardless of the current process value, without the need for
calculations.
When sample calibration is made with temperature compensation activated, the types of
temperaturecompensationforlaboratoryanalysisequipmentshouldbematched.Useofa
differenttypeoftemperaturecompensationbetweenequipmentcausesanerror.Thestandard
conductivity meter to be used should always be based on the accurate and same temperature
compensation calculation method. Yokogawa recommends that the Model SC82 pocket
conductivity meter be used for this purpose.
Press[TakeSample]torecordacollectedsamplevalueinmemory.Re-entertheSampleCal.
screenandpress[Startcalibration]toperformasamplecalibration.Thisupdatestherecorded
data.
11.5 Temperaturecoefcient
Simply input the solution conductivity at the reference temperature (TR) after allowing the sensor
tostabilizeatelevatedtemperatures.TheFLXA21willcalculatethetemperaturecoefcientfor
you. The ideal temperature for this calibration is the normal process value (TP). This calibration is
enabled if the Temperature Compensation is set to “TC.” (Refer to section 10.1.4)