YOKOGAWA FLXA21 User Manual

<7. COMMISSIONING OF SC (Conductivity)>
7-5
IM 12A01A02-01E 8th Edition : Oct. 01, 2015-00
NOTE
The temperature compensation is not performed around zero. In this case, a warning may be
issued.
7.1.5 Calibration settings
The screen ow differs depending on the combination of objects to be measured.
l Air adjust limit
Generally, air calibration is not required. To avoid the effects of the cable on the measurement of
lower conductivities such as pure water, a “zero” calibration with a dry sensor may be done.
When using a 4-electrode sensor, additional connections are required. Temporarily interconnect
terminals 13 & 14 with each other and 15 & 16 with each other before making the adjustment.
This is necessary to eliminate the capacitive inuence of the cables. The links should be removed
after this step is completed.
As the calibration is performed in air, the resistivity is innite (open connection). Higher
conductivity values than the air adjust limit indicate that the cell is not in air or is still wet. To
prevent wrong air calibrations, a limit must be given here.
l c.c. high
High limit of the cell constant expressed as a % of the nominal value. During calibration this value
is used to check if the calibrated cell constant remains within reasonable limits.
l c.c. low
Low limit of the cell constant expressed as a % of the nominal value. During calibration this value
is used to check if the calibrated cell constant remains within reasonable limits.
l Step Range
Set the range over which the stability of a measured value is checked. If variations of a measured
value over the stabilization time are within this set value, the measured value is judged to have
stabilized.
l Stabilization time
During calibration, the stability of the measurement is constantly monitored. When variations of
the value are within a value set in Step Range over this stabilization time set here, the value is
regarded as being stable. If the value does not stabilize within 10 minutes, calibration is aborted.
l Calibration interval
Set the interval in which a new calibration must take place. If the interval set here is exceeded,
the instrument will be notied according to the setting in “Calib. time exceeded” in the error
conguration.
7.1.6 Concentration
The “Concentration” can be set only when “Conduct. + Concentr.” or “Concentration” is selected
for the Measurement in the Measurement setup menu.
The corresponding concentration given by a measured conductivity can be shown on the Main
display or the Home display.
SC
7

YOKOGAWA FLXA21 Specifications

General

Brand	YOKOGAWA
Model	FLXA21
Category	Measuring Instruments
Language	English