Ph Electrode Conditioning And Maintenance - Hanna Instruments HI83300 Instruction Manual

7.6. pH ELECTRODE CONDITIONING AND MAINTENANCE

Remove the protective cap of the pH electrode.
DO NOT BE ALARMED IF SALT DEPOSITS ARE PRESENT.
This is normal with electrodes. They will disappear when rinsed with water.
During transport, tiny bubbles of air may form inside the glass bulb affecting proper functioning of
the electrode. These bubbles can be removed by "shaking down" the electrode as you would do with
a glass thermometer. If the bulb and/or junction is dry, soak the electrode in HI70300 or HI80300
storage solution for at least one hour.
For refillable electrodes:
If the fi lling solution (electrolyte) is more than 2½ cm (1") below the fill hole, add HI7082 or
HI8082 3.5M KCl Electrolyte Solution for double junction electrodes.
Unscrew the fill hole cover during measurements so the liquid reference junction maintains
an outward + ow of electrolyte.
Measurement
Rinse the electrode tip with distilled water. Submerse the tip 3 cm (1¼") in the sample and stir
gently for a few seconds. For a faster response and to avoid cross‑contamination of the samples, rinse
the electrode tip with a few drops of the solution to be tested, before taking measurements.
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