Hanna Instruments HI98190 - Wrong Slope; Wrong Old Slope

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pH CALIBRATION
Electrode Dirty/Broken alternatively with Buffer Contaminated
The calibration cannot be confirmed.
The offset of the electrode is not in the accepted range. Check if the electrode is broken or clean it
following the Cleaning Procedure (see page 57). Check the quality of the buffer. If necessary, change
the buffer.
Wrong slope
The calibration cannot be confirmed.
The evaluated slope is less than the lowest accepted value (80% of default slope).
The evaluated slope is more than the highest accepted value (110 % of default slope).
Wrong old slope
An inconsistency between new and previous (old) calibration is detected. Clear old calibration
parameters and proceed with the calibration from the current point. The instrument will keep all
confirmed values during current calibration.
Note: For one point calibration the electrode condition is not displayed in the measurement
screen. Each time a buffer is confirmed, the new calibration parameters replace the old
calibration parameters of the corresponding buffer.