Yokogawa EXAxt SC450 4-Wire Analyzer for Conductivity/Resistivity - Manual (Page 24)

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IM 12D08N05-01E
4-3-1. Actual mA1 = the current output in mA of
the first current output, which is defined as mA1.
The range and function of this mA output can be
set in:
Routing: Commissioning >> Output setup
>> mA1
4-3-2. Actual mA2 = the current output in mA of
the second current output, which is defined as
mA2. The range and function of this mA output
can be set in:
Routing: Commissioning >> Output setup
>> mA2
4-3-3. S1/S2/S3/S4 = the current state of
contacts 1 to 4. The functions and settings of the
contacts can be set in:
Routing: Commissioning >> Output setup
>> S1/S2/S3/S4
4-3-4. C.C. (factory) = the nominal cell constant
as determined by the factory calibration during
production. This value is set during commission-
ing, and is found on the nameplate of the sensor
or the calibration certificate.
Routing: Commissioning >> Measurement
setup >> Configure sensor
4-3-5. C.C. (adjusted) = the calibrated cell
constant. When the cell constant of the system is
adjusted on-line by grab sample or by calibrated
solution technique, the new cell constant is
recorded here. This value should not deviate
greatly from the original factory calibration. In
the event that there is a significant discrepancy
seen between this reading and the C.C. (factory)
value, the sensor should be checked for damage
and cleanliness.
Routing is via the “Calibration” menu.
4-3-6. Temp. comp 1 = the chosen temperature
compensation method for the primary measure-
ment.
Routing: Commissioning >> Measurement
setup >> Temp.compensation
4-3-7. Temp. comp 2 = the chosen temperature
compensation method for the secondary meas-
urement.
Note: This does not imply two separate meas-
urements. There is the possibility to set two
separate compensation methods so that two
different stages of the same process can be
monitored accurately. An example is process/
cleaning fluid interface.
Routing: Commissioning >> Measurement
setup >> Temp.compensation
4-3-8. Polarization = the polarization is meas-
ured by the input circuitry. Monitoring this figure
gives a guide to progressive fouling of the sensor.
4-3-9. Sensor ohms = the input measurement
as an uncompensated resistance value.
4-3-10. Last calibrated at = the date of the last
calibration
4-3-11. Calibration due at = the date scheduled
for the next calibration. This field is determined by
the calibration interval.
Routing: Commissioning >> Measurement
setup >> Calibration settings
4-3-12. Projected calibration at =
a diagnostic output, showing a time frame when
the unit should next be maintained according to
the sophisticated self-diagnostic tools built into
the EXAxt software (for example >12 months,
3-6 months or 0-1 month).
The analyzer checks the rate of polarization
every 24 hours. If a clear increase of polariza-
tion is observed, the user is notified when a
next calibration should take place. Prior to
calibration the sensor should be well cleaned
and rinsed.
4-3-13. HART ID = a part of the HART device ID
(descriptor)
4-3-14. Software revision = the revision level of
the software in the instrument.