KROHNE OPTISENS PAM 2080 EN - Manual (Page 36)

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6.3 Offset Calibration
Offset calibration is used to compensate for the electrode drift that sets in due to the interaction of the
probes with the measuring medium.
This drift is dependent upon the substances contained in the water and is therefore different for every
measuring point. With time, you will establish how often you need to carry out an offset in each case.
Offset calibration is very easy to carry out. The probe generally remains in the measuring medium in the
process.
Carrying Out Offset Calibration
Select the measuring channel that you wish to calibrate.
Set the calibration type to offset calibration ("Calibration – Cal.method – Offset). Ensure that
measurement is active (must not remain on “Hold”).
Now press the Cal button once.
Displays of “Hold”, “Electrode active”, “Buffer”, “Run time” indicate that the offset routine is
running.
The symbols “Hold”, “Buffer” and “Run time” are displayed after approx. 20 sec.
Now press the Cal button once more in order to save the determined measurement internally.
You now have 2 hours.