Hanna Instruments HI 84442 - Manual (Page 23)

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Verify: The electrode has been calibrated in 4.01 pH buffer.
• Sample preparation: Add 1 mL of HI 84442-55 Pump
Calibration Solution to a clean beaker.
Fill the beaker up to the 75 mL mark with the distilled or
deionized water. Place the stir bar into the beaker and
then place the beaker into the appropriate place on the
instrument top.
• Place the electrode holder on the top of the beaker and
secure it by turning clockwise.
• Before immerse the electrodes in the beaker:
- Carefully rinse the pH electrode and temperature
probe with deionized water.
- Dry electrodes using soft paper.
- Rinse again with the deionized water.
• Immerse the calibrated pH 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 guide tube holder
place taking care not to empty the tip.
Note: The chemical reagents may be hazardous if improperly
handled. Read the Material Safety Data Sheets (MSDS)
before performing the test.
•From the titrator main screen press CAL.
After 5 minutes purging interval has elapsed, the “Completed” message is displayed. Another
purge period can be initiated by pressing Restart or press ESC to return to main titrator screen.
PUMP CALIBRATION PROCEDURE
The pump calibration must be performed each time the titrant bottle or the pH electrode is
changed. It is recommended the pump calibration to be performed before each set of titrations.