Hanna-instruments HI 84529 Manual de usuario descargar pdf (Pagina 24)

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Setup/Installation

Electrode

Calibration

Procedure

plug and o-ring on ll hole spout.

8. Using the dropper pipette provided, add a few drops of HI 7072 ll

solution to the electrode. Invert electrode to wet the o-ring and rinse

the electrolyte chamber.

9. Holding the body of the electrode gently press the cap with your thumb.

This permits the ll solution to drain out of the body. Release your thumb

and verify electrode returns to its original position (you may need to

gently assist for this to occur).

10. Fill electrode body with HI 7072 ll solution until solution volume is just

below ll hole.

Note: During measurement always operate reference electrode with the ll

hole open.

Measurement

Place pH electrode and reference electrode into electrode holder and connect

the electrodes to the instrument.

Rinse the pH and reference electrodes with distilled or deionized water.

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.

Electrode

Preparation

Procedure

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Hanna-instruments HI 84529 Manual de usuario Pagina 24