Hanna Instruments HI 98180 - Manual (Page 24)

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CLEAR CALIBRATION
Press
Clear functional key when displayed or CLR key (HI 98180 &
HI 98181) to clear old calibrations.
All old calibrations, are cleared and the instrument continues calibration. The
points confirmed in current calibration are kept.
Note: If Clear calibration is invoked during the first calibration point, the
instrument returns to measurement mode.
ELECTRODE CONDITION
The display is provided with an icon, and a numeric value (unless the feature
is disabled) which gives an indication of the electrode status after calibration.
The “condition” remains active until the end of the calibration day.
Note: The electrode condition is evaluated only if current calibration includes
at least two standard buffers.
CLEAN ELECTRODE WARNING
Each time pH calibration is performed, the instrument internally compares the
new calibration with the one previously stored.
When this comparison indicates a significant difference, the
“Clean electrode”
warning message is displayed to advise the user that the pH electrode may
need to be cleaned (see ELECTRODE CONDITIONING & MAINTENANCE section for
details, page 61).
After cleaning, perform a new calibration.
Note: If the calibration data are cleared, the comparison is done with the
default values.