Incorrect calibration
An error message ‘ERR’ appears if
the result of the calibration lies out‐
side the specified tolerance limits. In
this case the current calibration is not
applied.
Check the prerequisites for calibration
and clear the error. Then repeat cali‐
bration
In the event of repeated calibration
failure, observe the notes given in the
sensor operating instructions.
During calibration, the controller sets the
control outputs to
‘0’
. Exception: If a basic
load or a manual control variable has
been set. This remains active. The mA
standard signal output is frozen.
When calibration has been completed
successfully, all of the error checks
relating to the measured value are
restarted. The controller saves the data
determined for the cell constant and tem‐
perature coefficient when the calibration is
successful.
The conductivity sensors can be cali‐
brated using 3 different methods. The cell
constant is adjusted directly or indirectly in
all methods:
n Calibration compared to a reference
solution
n Calibration compared to a reference
measurement (e.g. manual measuring
device)
n Calibration by entering a precisely
known or determined cell constant
Operating menus
56
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