Hanna Instruments HI 221 - Manual (Page 13)

13 2
CAL
CLEAR CAL if new electrode
ATC
BUFFER 1
pH
ATC
CAL CFM
BUFFER 1
pH
ATC
ELECTRODE CLEAN
ELECTRODE
This message appears if the cleaning procedure performed as a result of the
above two messages is found by the instrument to be unsuccessful. Replace the
electrode.
WRONG BUFFER TEMPERATURE
This message appears if the temperature of the buffer is outside the defined
buffer temperature range.
WARNING MESSAGES
During calibration, the Calibration Check feature analyzes the electrode calibration
history and warns the user when problems have been detected. It is possible to
over ride the warning messages and confirm the calibration but it is not
recommended.
CLEAR CAL IF NEW ELECTRODE
This warning is displayed any time the new calibration parameters are better
than the previous parameters. You can clear the calibration history by press-
ing the CLR key, or continue by pressing the CAL key.
CLEAN ELECTRODE
This warning appears during Calibration Check for the second calibration
buffer when the instrument has detected a small variation of offset or both
offset and slope parameters. This variation may result from dirt on the
electrode. Refer to the electrode cleaning procedure. This ensures the removal
of film, dirt or deposits on the glass bulb and reference junction.
CLEAN ELECTRODE alternating with CHECK BUFFER
This warning appears during Calibration Check in the first calibration buffer as
CAL
WRONG
CLEAR CAL if new electrode
ATC
pH
BUFFER