Hanna Instruments HI 98150N - Manual (Page 15)

15
CLEAR CALIBRATION
To clear calibration press
2nd then CLR or CLR alone
after entering CAL mode. The “ CLr ALL” message will
be displayed on the LCD along with “ Cal Due” CLR
message blinking.
All old calibrations, starting with current selected buffer are cleared and
the instrument continues calibration.
Note: If CLR is pressed during the first calibration point, the instrument
returns to measurement mode.
CONDITION
The display is provided with a 5-dot bargraph (unless the feature is
disabled) which gives an indication of the electrode status after
calibration as follows:
Bargraph indication Condition value
All 5 dots steady 81 to 100% of life
4 dots steady 61 to 80%
3 dots steady 41 to 60%
2 dots steady 21 to 40%
1 dot steady 1 to 20%
1 dot blinking 0%
Only frame is ON No info available
The “condition” bargraph 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
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” “ ”
tags blink on the LCD to advise the user that the pH electrode may need
to be cleaned (see ELECTRODE CONDITIONING & MAINTENANCE section
for details, page 37).
After cleaning, perform a new calibration.
Note: If calibration data are cleared, the comparison is done with the
default values.