Hanna-instruments HI 8711 Manual de usuario descargar pdf (Pagina 39)

CLEANING PROCEDURE

• General Soak in HI 7061

general cleaning solution for

approximately 1 hour.

Removal of films, dirt or deposits on the membrane/junction:

• Protein Soak in Hanna HI 7073

protein cleaning solution

for 15 minutes.

• Inorganic Soak in Hanna HI 7074

inorganic cleaning solution

for 15 minutes.

• Oil/grease Rinse with Hanna HI 7077

oil & fat cleaning solution.

IMPORTANT: After performing any of the cleaning procedures, rinse

the electrode thoroughly with distilled water, drain and refill the

reference chamber with fresh electrolyte, (not necessary for gel-filled

electrodes) and soak the electrode in HI 70300

storage solution for at

least 1 hour before taking measurements.

TROUBLESHOOTING

Evaluate your electrode performance based on the following:

••

• Noise

(readings fluctuate up and down) could be due to:

- Clogged/Dirty Junction:

refer to the above "Cleaning Procedure"

- Loss of shielding due to low electrolyte level (in refillable

electrodes only): refill with HI 7071

solution for single junction

or HI 7082

for double junction electrodes

••

• Dry Membrane/Junction: soak in HI 70300

storage solution for

at least 1 hour

••

• Drifting: soak the electrode tip in warm HI 7082

solution for one

hour and rinse the tip with distilled water; refill with fresh electrolyte

(HI 7071

for single junction and HI 7082

for double junction

electrodes)

••

• Low Slope: refer to the above "Cleaning Procedure"

••

• No Slope:

check the electrode for cracks in glass stem or bulb

(replace the electrode if cracks are found)

••

• Slow Response/Excessive Drift:

soak the tip in HI 7061

solution

for 30 minutes, rinse thoroughly in distilled water and then follow

the above "Cleaning Procedure"

••

• For ORP Electrodes: polish the metal tip with a light abrasive

paper (pay attention not to scratch the surface) and rinse

thoroughly with water.

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Hanna-instruments HI 8711 Manual de usuario Pagina 39

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