Hanna Instruments edge PHM4092, Руководство пользователя, Страница: 36 / 44

Maintenance 36
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 aff ecting
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 HI 70300 or HI 80300 storage solution
for at least one hour.
For refi llable electrodes:
If the fi lling solution (electrolyte) is more than 2½ cm (1”) below the fi ll hole, add
HI 7082 or HI 8082 3.5M KCl Electrolyte Solution for double junction electrodes.
Unscrew the fi ll hole cover during measurements so the liquid reference junction
maintains an outward fl 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.
Storage Procedure
To minimize clogging and ensure a quick response time, the glass bulb and the
junction should be kept moist and not allowed to dry out.
Maintenance
pH Probe
Maintenance