Hanna-instruments HI 8711 Manual de usuario descargar pdf (Pagina 38)

PERIODIC MAINTENANCE

Inspect electrode and cable. The cable used for the connection to the

meter must be intact and there must be no points of broken insulation

on the cable or cracks on the electrode stem or bulb.

Connectors must be perfectly clean and dry. If any scratches or cracks

are noted, replace the electrode.

Rinse off any salt deposits with water.

For refillable electrodes:For refillable electrodes:

For refillable electrodes:

Refill the electrode with fresh electrolyte solution (HI 7071

for single

junction electrodes or HI 7082

for double junction). Allow the elec-

trode to stand upright for 1 hour.

Follow the above "Storage Procedure".

AmpHel

is a registered Trademark of "Hanna Instruments"

For refillable electrodes:For refillable electrodes:

For refillable electrodes:

If the internal electrolyte solution is more than 1 cm (½") below the

filling hole, add HI 7082

solution (3.5M KCl) for double junction

electrodes or HI 7071

(3.5M KCl+AgCl) for single junction electrodes.

For a faster response unscrew the filling hole screw during measurements.

For AmpHelFor AmpHel

For AmpHel

®®

electrodes: electrodes:

electrodes:

If the electrode does not respond to pH changes, the battery is run

down and the electrode should be replaced.

MEASUREMENT

Rinse the electrode tip with distilled water.

Immerse the electrode tip (4 cm) in the sample and stir gently for

approximately 30 seconds.

For a faster response and to avoid cross contaminations, before taking

measurements, rinse the electrode tip with some solution to be tested.

STORAGE

To minimize clogging and assure a quick response time, the electrode

glass bulb and junction should be kept moist at any time.

Store the electrode with a few drops of HI70300 storage solution in

the protective cap (in its absence, use HI 7071

electrolyte for single

junction, or HI 7082

for double junction electrodes).

Follow the above "Preparation Procedure" before taking measurements.

Note: NEVER STORE THE ELECTRODE IN DISTILLED WATER OR DRY.

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Hanna-instruments HI 8711 Manual de usuario Pagina 38

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