Hanna Instruments HI 84502 - Manual (Page 20)

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Point 1 calibration
• The default buffer selected will be 7.01 if end point was set to 7.00 pH or else 8.20 pH will
be selected. 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 Confirm key will become active.
• Press Confirm to confirm the calibration or ESC to exit calibration.
• After the first calibration point has been confirmed, press ESC to exit without performing the
second calibration point.
Point 2 calibration
• The calibrated value will be shown on the display and the second expected buffer value will
be displayed.
• Remove the electrode holder with electrodes from the top of the beaker.
• Place the second beaker with calibration buffer in the 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 and secure it by turning
clockwise and press STIR.
• If necessary, press the ARROW keys in order to select a different buffer value.