Hanna Instruments HI 84429 - Manual (Page 20)

20
THREE POINT CALIBRATION
• From the pH meter/titrator calibration menu screen select the Electrode calibration option.
The electrode calibration screen will be displayed.
• The 6.00 buffer will be selected by default. If necessary press the ARROW keys in order to
select a different buffer value.
• 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 CFM key will become active.
• Press CFM to confirm the calibration.
• The calibrated value will be shown on the display and the second expected buffer value will
be displayed.
• After the first calibration point has been confirmed, press STIR to stop stirring.
• Remove the electrode holder with electrodes from the top of the beaker.
• Place the second buffer into beaker and place in beaker holder. Rinse the electrodes in a
beaker containing the second buffer rinsing solution.
• Place the electrode holder (with electrodes) on the top of the beaker, lock cap by turning and
press STIR.
• If necessary press the ARROW keys in order to select a different buffer value.
• The
(unstable measurement) symbol will be shown on the display until the reading
becomes stable.