KROHNE OPTISENS PAM 2080 EN - Manual (Page 29)

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6 Calibration
6.1 Preparation for sensor calibration
To ensure that the measuring system can supply you with correct online data, the installed sensors must
be pre-calibrated.
It is essential that you pay attention to the following information:
Remove all potential protective caps, if present, from the sensors.
In the case of ion-sensitive probes (ISE), check that there are no air bubbles adhering to the inner
side of the membrane. For procedure for removing air bubbles.
Leave the immersion holder with the sensors in the measuring medium for at least one hour before
you commence with a calibration. The sensors need this time in order to get used to the medium
matrix.
We recommend undertaking the following types of calibration:
2-point calibration when:
- - Starting up for the first time.
- - Changing/regenerating electrodes.
- - Changing the measuring point (≈ change of matrix).
Offset calibration:
- - Regularly during permanent operation depending on electrode drift.