Hanna-instruments HI 84529-01 Manual do Utilizador descarregar pdf (Página 25)

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Operational Guide

Immerse the pH and reference electrodes 1.5 cm (0.6”) in the sample and stir

gently for a few seconds.

For a faster response and to avoid cross-contamination of the samples, rinse

the electrodes with a few drops of the solution to be tested, before taking

measurements.

It is recommended to calibrate the instrument frequently, especially if high

accuracy is required. The pH electrode should be recalibrated:

1. Whenever the pH electrode is replaced

2. At least once a week, but daily is advised

3. After testing aggressive chemicals and after the electrode is cleaned

4. When high accuracy is required

5. If the pH calibration expired warning is displayed during measurement

Every time you calibrate the instrument use fresh bu ers and clean the

electrode.

Procedure

A single one, two or three-point calibration can be performed, using the four

prede ned bu ers 4.01, 6.00, 8.30 and 10.01 pH. For a single point calibration

any of the four bu ers may be used, 8.30 pH is recommended.

Note: The HI 84529 will not accept other pH bu ers for calibration.

1. Pour small quantities of selected bu er solutions into clean beakers. For

accurate calibration used two beakers for each bu er solution, the  rst

one for rinsing the electrode and the second one for calibration.

2. Put a magnetic stir bar in the beaker that will be used for calibration.

3. Remove the protective cap and rinse the electrode with some of the

bu er solution to be use for the  rst calibration point.

4. Put the  rst beaker with calibration bu er in the beaker holder.

5. Place the electrode holder on the top of the beaker and secure it by

turning clockwise and press STIR.

6. Immerse the pH electrode and the temperature probe approximately

2 cm (0.8”) into the bu er, paying attention not to touch the stir bar.

To enter Electrode Calibration follow the next steps:

1. Press CAL function key then ELECTRODE.

2. The electrode calibration screen will be displayed.

3. Press CLEAR to delete the previous calibration.

Electrode

Calibration

Procedure

Electrode

Preparation

Procedure

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