18.5 Help texts
Content of the help
texts
Cause Remedy
The DPD value is too
small, DPD value >
MRS + 2 %
If the calculated reference value (e.g.
DPD1) for calibrating a sensor is less
than 2 % of the measuring range, then
calibration is not possible.
Increase the concentration of
the chemical to be measured
in the process/sample water
and determine the reference
value again (e.g. DPD1) after
the run-in period.
The slope is too
shallow, < 20 % of the
MR
The sensor can no longer detect the
chemicals to be measured
Replace the membrane cap
and replace the electrolyte for
new material
The slope is too steep,
> 300 % of the MR
The sensor has been permanently
affected by for example surface-active
substances (surfactants).
Make sure that none of these
substances are present in the
water. Replace the membrane
cap and replace the electro‐
lyte for new material
The zero point is too
low, < 3.2 mA
The sensor delivers a measured signal
that is less than 3.2 mA. This value is
outside of the specification.
Check the raw value in mA in
the Information menu, by
pressing in the main dis‐
play. If the value is < 3.2 mA,
then this is not the correct
sensor signal. Check the
cabling and replace the
sensor with a new sensor.
The zero point is too
high, > 5 mA
You would like to calibrate the zero
point but the sensor is still detecting the
chemical to be measured
Rinse the sensor with water
containing no chemicals that
are to be measured before
zero point calibration. The
water with which the zero
point is determined should
also not contain traces of this
chemical. Use mineral water
without carbon dioxide for this
purpose.
An unknown calibration
error
In the residual period
parameter set 1 is used
If parameter set 2 is not active, then
parameter set 1 is activated
Check the control signals/lines
that switch the parameter set
or check the timer settings.
[Diagnostics]
174
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