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

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Operational Guide

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.

1 Point Calibration

1. The 8.30 buer will be selected

by default. If necessary, press the

ARROW keys in order to select a

dierent buer value.

2. The (unstable measurement)

symbol will be shown on the display

until the reading becomes stable.

3. When the reading is stable and

close to the selected buer, the

(unstable measurement) symbol will

disappear and the CONFIRM key will

become active.

4. Press CONFIRM to conrm the

Electrode

Calibration

Procedure

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Hanna-instruments HI 84529 Manual do Utilizador Página 25