ProMinent DULCOMETER diaLog DACb Assembly And Operating Instruction page 106

Calibration
Remove sample water directly at the measuring
point and determine the content of the feed
chemical in the sample water in
appropriate reference method (e.g. DPD, titra‐
tion etc.). Enter this value into the controller as
follows:
1. Press in the continuous display.
2. Use the arrow keys to select
[Slope calibration]
3. Continue with
CAL Cl
Latest sensor measured values
Concentration
Sensor current
1) Wait until meas values stable
2) Take sample and continue with <CAL>
Fig. 61: Reference value calibration shows the
actual sensor values
4. Continue with
CAL Cl
Determine reference value
Measured value upon sampling
Change with <OK>
106
[ppm] using an
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continue with <CAL>
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Fig. 62: Reference value calibration, the sensor
value is frozen here; now take the sample and
measure using DPD, for example
5. Then press
or press to continue with the calibra‐
tion
CAL Cl
Calibration successful
Slope
Zero point
continue with <CAL>
Fig. 63: Calibrating the reference value
6. Transfer the result of the calibration into
the controller memory by pressing
The controller displays the contin‐
ð
uous display again and operates
with the results of the calibration.
Incorrect calibration
An error message appears
if the result of the calibra‐
tion lies outside the speci‐
fied tolerance limits. In this
case, the current calibration
is not applied.
Check the prerequisites for
calibration and clear the
error. Then repeat calibra‐
tion
to adjust the ppm value
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