Hanna Instruments HI 98180 - Manual (Page 22)

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Wrong old slope
An inconsistency between new and previous (old) calibration is detected. Clear
old calibration parameters and proceed 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.
If current confirmed buffer has no correspondence in the existing stored calibration
and this is not full, the current buffer is added to the existing stored calibra-
tion.
If the existing stored calibration is full (five calibration points), after confirming
the calibration point, the instrument will ask wich buffer will be replaced by
current buffer.
Press ARROW keys to select another buffer to be replaced.
Press CFM to confirm the buffer that will be replaced.
Press CAL or ESC to leave replace mode. In this case, the buffer will not be
memorised.
Note: The replaced buffer is not removed from calibration list and it can be
selected for the next calibration points.