Hanna-instruments HI 84502 Manual do Utilizador descarregar pdf (Página 26)

Note: Failure to use a clean pipette will result in erroneous

readings.

• Fill the beaker up to the 50 mL mark with the distilled or

deionized water.

• Press CAL key. The instrument displays the date and time of

the last electrode calibration, and the last pump calibration.

• Press Pump key.

Note: DO NOT PLACE THE TIP INTO THE CALIBRATION

BEAKER, PLACE THE TIP OVER A WASTE BEAKER.

A SMALL AMOUNT OF TITRANT IS DISPENSED

WHEN THE PUMP RESETS.

• Press Start, wait for the syringe to refill.

• Place the stir bar in the beaker and put the beaker in the

minititrator top.

• Place the probe holder on the top of the beaker and secure it

by turning clockwise.

• Rinse the pH electrode with deionized water and immerse

into the sample until the PTFE reference junction is completely

submerged. Be sure that the tip of the electrode is not hitting

the stir bar. If necessary, additional distilled or deionized

water can be added.

PUMP CALIBRATION PROCEDURE

• Verify the electrode has been calibrated in 8.20 pH buffer or in 7.01 pH buffer.

Sample preparation: Use a clean tip and 2000 uL automatic pipette to precisely add the

appropriate amount of HI 84502-55 Calibration Standard to a clean beaker as indicated below:

egnaRwoL egnaRhgiH

L/g0.5ot1.0 L/g0.52ot0.4

Low Range - 4 mL

High Range - 4 mL

The calibration of the pump must be performed every time the syringe, pump tube, the titrant

bottle or the pH electrode is changed. It is recommended to perform the pump calibration before

each set of titration or after the titrator is left idle for several hours.

• Press MENU, select Setup and select the corresponding range according to the table below:

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 43 44

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Hanna-instruments HI 84502 Manual do Utilizador Página 26