Calibrating The Ph Sensor - ProMinent DULCOMETER diaLog DACb Assembly And Operating Instruction

Calibration
10.1

Calibrating the pH Sensor

To ensure a high level of measuring accuracy, adjust the pH sensor at set time intervals. This cali‐
bration interval seriously depends on the application of the pH sensor and on the required measure‐
ment accuracy and reproducibility. The calibration interval can vary between daily and every few
months.
Tab. 12: Valid calibration values
Evaluation
Good
Acceptable
If you measure the pH with potential equalisation, set the [Potential equalisation] procedure
as a parameter when selecting the measured variable as a parameter.
Calibrate the pH-sensor for the function: pH compensation for chlorine measurement
It is mandatory that the pH measurement is always calibrated first and then the chlorine
measurement. All other calibration of the pH measurement must always be followed by cali‐
bration of the chlorine measurement. Otherwise the chlorine measurement will be inaccu‐
rate.
82
Zero point
-30 mV ... +30 mV
-60 mV ... -30 mV
+30 mV ... +60 mV
Slope
-55 mV/pH ... -62 mV/pH
- 40 mV/pH ... -55 mV/pH
-62 mV/pH ... - 65 mV/pH