Hanna Instruments HI 84529 - Manual (Page 25)

www. hannainst .com 25 Operational Guide
Procedure
A single one, two or three-point calibration can be performed, using the four
predefined buffers 4.01, 6.00, 8.30 and 10.01 pH. For a single point calibration
any of the four buffers may be used, 8.30 pH is recommended.
Note: The HI 84529 will not accept other pH buffers for calibration.
1. Pour small quantities of selected buffer solutions into clean beakers. For
accurate calibration used two beakers for each buffer solution, the first
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
buffer solution to be use for the first calibration point.
4. Put the first beaker with calibration buffer 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 buffer, 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 buffer will be selected
by default. If necessary, press the
ARROW keys in order to select a
different buffer 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 buffer, the
(unstable measurement) symbol will
disappear and the CONFIRM key will
become active.
4. Press CONFIRM to confirm the
Electrode
Calibration
Procedure