Endress+Hauser ASP Station 2000 peristaltic Manuel D'utilisation page 96

Operation
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6. Check the pH measurement.
The procedure for two-point (pH #2) or three-point calibration (pH #3) is the same as for one-point
calibration. The individual measurements are taken one after another for different buffer solutions.
Note!
To achieve exact measured values, a "two-point calibration" at least is required.
Checking the pH measurement (sensor check system)
The pH value corresponds to a mV signal which is output by the pH sensor. Here, a certain pH value
is in a certain mV range.
Example:
pH 7 is in a range between -40 mV and +40 mV. If the pH value is outside this range, the pH sensor
is most probably faulty and has to be replaced. It is possible to display the mV signal output by the
pH sensor with the sensor check system.
Menu structure:
Fig. 29: Checking the pH measurement (sensor check system)
Calibrating redox (ORP) measurement
Fig. 30: Menu structure for redox (ORP) measurement calibration
ASP station 2000 peristaltic
Endress+Hauser