Hanna Instruments HI 8614N User Manual

Page 10

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 Cleaning Procedure

above.

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

electrodes only):

HI 7071 for single junction or HI 7082 for

double junction electrodes.

•

Dry Membrane/Junction: soak in HI 70300 storage solution for
at least one hour.

•

Drifting: soak the electrode tip in warm Hanna solution HI 7082
for one hour and rinse the tip with distilled water. Refill with fresh
HI 7071 for single junction electrodes and HI 7082 for double
junction electrodes.

•

Low Slope: refer to the Cleaning Procedure above.

•

No Slope: check the electrode for cracks in glass stem or bulb and
replace the electrode.

•

Slow Response/Excessive Drift: soak the tip in Hanna HI 7061
cleaning solution for 30 minutes, rinse thoroughly in distilled
water and then follow the Cleaning Procedure above.

CLEANING PROCEDURE

• General

Soak in Hanna

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.

For refillable electrodes

For refillable electrodes
If the fill solution (electrolyte) is more than 1 cm (½") below the fill
hole, add

HI 7082 3.5M KCl electrolyte solution for double junction or

HI 7071 3.5M KCl+AgCl electrolyte solution for single junction
electrodes. For a faster response unscrew the fill hole screw during
measurements.

For AmpHel

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 tip (4 cm / 1½") in the sample and stir gently for
approx. 30 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
To minimize clogging and assuring a quick response time, the glass
bulb and the junction should be kept moist and not allowed to dry
out. Replace the solution in the protective cap with a few drops of
HI 70300 storage solution or, in its absence, filling solution (HI 7071
for single junction or

HI 7082 for double junction electrodes). Follow

the Preparation Procedure above before taking measurements.

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

PERIODIC MAINTENANCE

Inspect the electrode and the cable. The cable used for 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 present on the electrode body, replace the electrode. Rinse off any
salt deposits with water.

For refillable electrodes

For refillable electrodes
Refill it with fresh electrolyte (

HI 7071 for single junction or HI 7082

for double junction electrodes). Allow the electrode to stand upright for
1 hour.
Follow the Storage Procedure above.

This manual is related to the following products:

HI 8615N