IM 12D7B4-E-H
18
5-4. Calibration Settings
Air adjust limit
To avoid cable influences on the
measurement, a "zero" calibration with a
dry sensor may be done. If a connection
box (BA10) and extension cable (WF10) are
be used, "zero" calibration should be done
including this connection equipment.
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 influence of the
cables. The links should be removed after
this step is completed.
As the calibration is performed in air the
resistivity is infinite (open connection).
Lower values than the air adjust limit
indicate the cell is not in air or is still wet.
To prevent wrong air calibrations a limit
must be given here.
c.c. high limit
High limit of the cell constant expressed in
% of nominal value. During calibration this
value is used to check if the calibrated cell
constant remains within reasonable limits.
c.c. low limit
Low limit of the cell constant expressed in
% of nominal value. During calibration this
value is used to check if the calibrated cell
constant remains within reasonable limits.
Calibration Interval
A user defined interval in which a new
calibration should take place. If the interval
is exceeded the instrument will give a
warning or a fail (user definable in error
configuration 2/3)
5-5. Concentration
There are two ways to come to a
concentration value.
1.
use a matrix for temperature
compensation, which includes
concentration values. See section 5-3.
Commissioning>> Measurement
Commissioning>> Measurement
setup>> Temp.compensation>>
setup>> Temp.compensation>>
Method
Method
2.
use the additional concentration table,
which can be combined with any of the
temperature compensation methods.
Additional table
This 21x2 user defined concentration table
is used to come to more accurate
concentration values compared to the
temperature compensation matrix.
Enabling this additional table overrules the
concentration values obtained from the
matrix (if used).
Unit for table
The way the concentration values are
presented to the user. Changing the unit
will not result in a re-calculation of the
table.
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