27
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• Press
Pump
.
The next screen will be displayed.
• Press
Start
.
• After the pump calibration is started, on the upper right side of the display two animations will be
shown in order to indicate that the pump and the stirrer are working. On the lower right side of
the display is shown the amount of time that has passed since the beginning of the calibration.
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.
Verify:
The electrode has been calibrated in 8.30 pH buffer.
•
Sample preparation:
Precisely measure the amount of
HI 84430-55
Pump Calibration
Solution
as indicated below and add 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.
• Immerse the pH electrode approximatively 2 cm (0.8”) into
the standard paying attention not to touch the stir bar.
• Insert the temperature probe into the dedicated guide tube.
• Verify if the titrant correspondes to selected titration range.
For Low Range (Strong LR, Total LR) use the
HI 84430-50.
For High Range (Strong HR, Total HR) use the
HI 84430-51.
• Carefuly insert the dosing tip into the dedicated guide tube.
After the 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 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 titrations.
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Please set up the instrument before performing the pump calibration.
• Select the acidity type in SETUP menu to correspond with expected sample:
Low Range (Strong LR, Total LR) - 2 ml
High Range (Strong HR, Total HR) -20 ml
