User Guide

For refillable electrodes**: Refill the electrode 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 Stor-

age Procedure above.

CLEANING PROCEDURE

General Soak in Hanna HI 7061 General Cleaning

Solution for approximately ½ 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

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 reinstalling it.

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 Proce-

dure above.

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

able electrodes only): refill with HI 7071 for single

junction or HI 7082 for double junction electrodes.

• Dry Membrane/Junction: Soak in Storage Solution

HI 70300 for at least 1 hour. Check to make sure the

installation is such as to create a well for the electrode

bulb to constantly remain moist.

• Drifting: Soak the electrode tip in warm Hanna Solution HI

7082 for one hour and rinse tip with distilled water (refill

with fresh HI 7071 for single junction electrodes and HI

7082 for double junction electrodes if necessary).

• Low Slope: Refer to the cleaning procedure above.

• No Slope:

- Check the electrode for cracks in glass stem or bulb