Hanna Instruments HI 84529 - Manual (Page 27)

www. hannainst .com 27 Operational Guide
and press STIR. If necessary press the ARROW keys in order to select a
different buffer value.
4. The (unstable measurement) symbol will be shown on the display until
the reading becomes stable.
5. When the reading is stable and close to the selected buffer, the
(unstable measurement) symbol will disappear and the CONFIRM key
will become active.
6. Press CONFIRM to confirm the calibration. The instrument stores the
calibration value and returns to calibration menu, where the date and
time for the pH calibration will be updated.
Note: A buffer confirmed during the calibration process is removed from
the list of available buffers. 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. If
necessary change the buffer or the electrode.
If the measured offset isn’t within the preset limits (±45 mV), the meter will
display the message “Buffer Contaminated” alternatively with ”Electrode
Dirty/Broken”.
If the computed slope isn’t within the
preset limits, the meter will display the
message “Wrong Slope”. If the slope is too
high the
symbol will be displayed. If
the slope is too low the symbol will
be displayed.
Electrode
Calibration
Procedure