Calibrating The Ph Measured Value - ProMinent DULCOMETER Assembly And Operating Instructions Manual

9.1

Calibrating the pH measured value

To ensure high measuring accuracy, it is necessary that you adjust the pH sensor at set
time intervals. This calibration interval depends strongly on the application of the pH
sensor and on the required measurement accuracy and reproducibility. The calibration
interval can vary between daily and every few months.
Valid calibration values
Assessment
Very good
Good
Acceptable
If you carry out the pH value measurement using potential equalisation, then you
must set this approach when selecting the measured variable as a parameter.
1. You must remove the wire jumper, see terminal diagram, XE3 1_2 for channel 1
and XE7 1_2 for channel 2
2. You must now connect the liquid potential equalisation kit (part number 818438) to
the now free terminals.
For the in-line probe housing DGMA, you also need a liquid potential equalisation
plug (part number 791663)
3. Connect the liquid potential equalisation kit to the fitting (e.g. DGMa)
4. During calibration you must also immerse the liquid potential equalisation pin in the
buffer solution. Otherwise the calibration will be inaccurate or not possible
Zero point
-30 mV ... +30 mV
-45 mV ... +45 mV
-60 mV ... +60 mV
Calibrating the controller
Slope
56 mV/pH ... 60 mV/pH
56 mV/pH ... 61 mV/pH
55 mV/pH ... 62 mV/pH
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