Hanna Instruments HI 84432 - Manual (Page 19)

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Point 3 calibration
• Remove the electrode holder with electrode from the top of the beaker.
• Place the third buffer solution in a beaker and place in beaker holder. Rinse the probes in a
beaker with third buffer rinsing solution.
• Place the electrode holder (with electrode) in the beaker with third buffer and secure holder by
locking.
• The (unstable measurement) symbol will be shown on the display until the reading
becomes stable.
• When the reading is stable and close to the selected buffer, the (unstable measurement)
symbol will disappear and the Confirm key will become active.
• Press Confirm to confirm the calibration. The instrument stores the calibration value and returns
to pH meter/titrator calibration menu, where the date and time for the last pH will be updated.
Notes: • A buffer confirmed during the calibration process is removed from the list of
calibration buffers available for further calibration points.
• If the value measured by the instrument is not close to the selected buffer a “Wrong
Buffer” error message will be shown on the display.
Check if the correct buffer has been used or regenerate the pH electrodes by
following the Cleaning Procedure (see the “pH Cleaning Procedure” section). If
necessary change the buffer or the electrode.
• If the measured offset isn’t within the preset limits the meter will display the
message “Buffer Contaminated” alternatively with ”Electrode Dirty/Broken”.