Hanna Instruments HI 84429 - Manual (Page 26)

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After the 5 minutes purging interval has elapsed the “Completed” message is displayed.
Another purge period can be initiated by pressing Restart.
PUMP CALIBRATION PROCEDURE
The calibration of the pump must be performed each time the pump tube, the reagent bottle or
the pH electrode is changed. It is recommended to perform the pump calibration before each set
of measurements.
Verify: The electrode has been calibrated in 8.30 pH buffer.
• Sample preparation: Fill a beaker up to the 50 mL mark
with HI 84429-55 Standard. Place the stir bar into the
beaker and then place the beaker in the appropiate place on
the instrument top.
• Place the electrode holder on the top of the beaker and secure
it by turning clockwise.
• Immerse the pH, reference and the temperature electrodes
approximatively 2 cm (0.8”) into the sample to be tested
paying attention not to touch the stir bar.
• Insert the dosing tip in the appropriate holder place. Do not
immerse tip into solution.