User Guide

3332
HI70300 or HI80300 Storage Solution or, in its absence, Filling
Solution (HI7071 or HI8071 for single junction or HI7082 or HI8082
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, replace the electrode.
Rinse off any salt deposits with water.
For refillable electrodes:
Refill it with fresh electrolyte (HI7071 or HI8071 for single junction or
HI7082 or HI8082 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 or HI8061 General Cleaning
Solution for approximately 1 hour.
Removal of films, dirt or deposits on the membrane/junction:
- Protein Soak in Hanna HI7073 or HI8073 Protein
Cleaning Solution for 15 minutes.
- Inorganic Soak in Hanna HI7074 or HI8074 Inorganic
Cleaning Solution for 15 minutes.
- Oil/grease Rinse with Hanna HI7077 or HI8077 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 HI70300 or HI80300 Storage
Solution for at least 1 hour before taking any measurements.
TROUBLESHOOTING
Evaluate your electrode performance based on the following possibili-
ties:
• 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
Note: to prevent damage to the electrode, remove it from the sample
before turning the meter off.
If the meter is OFF, detach the electrode from the meter before
immersing the electrode in the storage solution.
PREPARATION
Remove the protective cap.
DO NOT BE ALARMED IF SALT DEPOSITS ARE PRESENT.
This is normal with pH-electrodes and they will disappear when rinsed
with water.
During transport tiny bubbles of air may form inside the glass bulb.
The electrode cannot function properly under these conditions. These
bubbles can be removed by "shaking down" the electrode as you
would do with a glass thermometer.
If the bulb and/or junction are dry, soak the electrode in HI70300 or
HI80300 Storage Solution for at least one hour.
For refillable electrodes:
If the fill solution (electrolyte) is less than 1 cm (½") below the fill
hole, add HI7082 or HI8082 3,5M KCl Electrolyte Solution for
double junction or HI7071 or HI8071 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 ensure a quick response time, the glass
bulb and the junction should be kept always moist and not allowed
to dry out.
Replace the solution in the protective cap with a few drops of
ELECTRODE CONDITIONINGELECTRODE CONDITIONING
ELECTRODE CONDITIONINGELECTRODE CONDITIONING
ELECTRODE CONDITIONING
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