Hanna Instruments HI 84529-01 - Manual (Page 25)

www. hannainst .com 25 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 buff ers and clean the
electrode.
Procedure
A single one, two or three-point calibration can be performed, using the four
predefi ned buff ers 4.01, 6.00, 8.30 and 10.01 pH. For a single point calibration
any of the four buff ers may be used, 8.30 pH is recommended.
Note: The HI 84529 will not accept other pH buff ers for calibration.
1. Pour small quantities of selected buff er solutions into clean beakers. For
accurate calibration used two beakers for each buff er solution, the fi 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
buff er solution to be use for the fi rst calibration point.
4. Put the fi rst beaker with calibration buff 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 buff 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