Hanna Instruments HI 504920 Instruction Manual Download Page 13

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ACCESSORIES

pH CALIBRATION SOLUTIONS

HI 70004P

pH 4.01 buffer, 20 mL sachet (25 pcs)

HI 70007P

pH 7.01 buffer, 20 mL sachet (25 pcs)

HI 70010P

pH 10.01 buffer, 20 mL sachet (25 pcs)

HI 7004L

pH 4.01 buffer, 500 mL bottle

HI 7006L

pH 6.86 buffer, 500 mL bottle

HI 7007L

pH 7.01 buffer, 500 mL bottle

HI 7009L

pH 9.18 buffer, 500 mL bottle

HI 7010L

pH 10.01 buffer, 500 mL bottle

ELECTRODE STORAGE SOLUTION

HI 70300L

Storage solution, 500 mL bottle

ELECTRODE CLEANING SOLUTIONS

HI 70000P

Rinsing solution, 20 mL sachet (25 pcs)

HI 7061L

General cleaning solution, 500 mL bottle

HI 7073L

Protein cleaning solution, 500 mL bottle

HI 7074L

Inorganic cleaning solution, 500 mL bottle

HI 7077L

Oil & Fat cleaning solution, 500 mL bottle

REFILL ELECTROLYTE SOLUTIONS

HI 7071

3.5M KCl + AgCl Electrolyte, 50 mL (4 pcs)

HI 7072

1M KNO

Electrolyte, 50 mL (4 pcs)

HI 7082

3.5M KCl Electrolyte, for double junction electrodes, 50
mL (4 pcs)

• Dry Membrane/Junction:

Soak in

Storage Solution HI 70300

for at least 1 hour.

• Drifting:

Soak the electrode tip in warm Hanna Solution

7082

for 1 hour, then flush 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 Solu-

tion

HI 7061

for 30 minutes, rinse thoroughly in distilled water

and then follow the Cleaning Procedure above.

Replace the solution in the protective cap with a few drops of

70300 Storage Solution

. 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, replace the electrode.
Rinse off any salt deposits with water.

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.

CLEANING PROCEDURE

General Soak in Hanna

HI7061

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 and Fat Clean

ing 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 possibilities:

• 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