Hanna-instruments HI 8711 Manuel d'utilisateur télécharger pdf (Page 36)

Oxidizing pre-treatment: immerse the electrode for some minutes in

HI 7092 solution.

If no pre-treatment is performed, the electrode will have long response

times.

If working with refillable electrodes, always check the internal electrolyte

level and refillwith HI 7071

solution, if necessary (the level must be at

least 2.5 cm below the filling hole).

If measurements are taken in solutions containing sulfides or proteins,

the cleaning of the electrode junction must be performed (see "Cleaning

Procedure" section for details).

To check the correct functioning of the ORP electrode, immerse it into

HI 7020 test solution and verify that the reading is within 200 and

275 mV.

After the test, rinse the electrode thoroughly with water and proceed

with the oxidizing or reducing pre-treatment before taking any

measurement.

When not in use, the electrode tip should be kept moist and far from

any type of mechanical stress which might cause damage. For this

reason, it is reccommended to store the electrode with a few drops of

HI 70300 storage solution in the supplied protective cap.

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Hanna-instruments HI 8711 Manuel d'utilisateur Page 36