Hanna Instruments HI 84432 - Manual (Page 26)

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Please set up the instrument before performing the pump calibration.
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 daily perform the pump calibration before you
start titrations.
Verify: The electrode has been calibrated in 8.20 pH buffer.
• Sample preparation: Precisely measure 2 mL of HI 84432-55
Pump Calibration Solution and add it to a clean beaker.
Fill the beaker up to the 50 mL mark with the distilled or
deionized water.
• Place the stir bar into the beaker and then place the beaker in
the appropriate place on the instrument top.
• Place the electrode holder on the top of the beaker and secure
it by turning clockwise.
• Before immersing the pH electrode and temperature probe
carefully rinse with deionized water.
• Blot dry using soft tissue. Do not rub.
• Insert the calibrated pH electrode and the temperature probe
through the electrode holder and immerse pH electrode bulb
approximatively 2 cm (0.8”) into the standard paying attention
not to touch the stir bar.
• Insert the dosing tip in the appropriate holder place through
guide tube. Immerse the tip into solution.
Note: The chemical reagents may be hazardous if improperly
handled. Read Health and Safety Data Sheets before
performing the test.
• From the titrator main screen press CAL.
The instrument displays the date and time of the last electrode calibration, and the date and
time of the last pump calibration, or calibration expired messages.
PUMP CALIBRATION PROCEDURE