Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 - Manual (Page 87)

<6. OPERATION OF SC (Conductivity)>
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IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
n Contact status
This screen is displayed only if the PH201G distributor is used and “PH201G” is selected in
communication setup.
n c.c. (factory)
This parameter displays the cell constant (factory setting).
The cell constant (factory setting) is determined by factory calibration made during sensor
manufacturing. This value can be set in Commissioning → Measurement setup → Sensor setup.
The cell constant is indicated on the sensor or cable label.
n c.c. (adjusted)
This parameter displays the cell constant (adjusted).
The cell constant (adjusted) is a cell constant that has been calibrated and is set by calibration
action.
When the system’s cell constant is adjusted on-line by calibration using a process solution or
buffer solution, a new cell constant is logged here. The difference between this value and the
default value set at factory shipment will not be large. If there is a large difference between them,
check whether the sensor is broken or contaminated.
n Temp. comp. 1
This parameter shows the temperature compensation method for 1st measurement. The setting
is made in Commissioning → Measurement setup → Temp. comp.
n Temp. comp. 2
This parameter shows the temperature compensation method for 2nd measurement. The setting
is made in Commissioning → Measurement setup → Temp. comp.
2nd measurement does not imply that two measurements can be made individually, but it means
that two types of compensation methods can be configured, which enables two phases to be
monitored accurately in the same process. An example is monitoring the switching between
process and washing solutions.
n Polarization
This parameter indicates the degree of polarization of the sensor. It is an index of the degree
of sensor contamination (adherents). The greater the value, the more the polarization has
progressed. If the value is high, maintenance should be performed on the sensor as soon as
possible.
n Sensor Ohm
This parameter represents the non-compensated resistance of the sensor.
n USP
USP stands for United States Pharmacopeia and indicates the margin of safety for the water for
injection (WFI) conductivity at each temperature as a percentage.
SC
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