20
21
If the bulb and/or junction are dry, soak the electrode in
HI 70300
Storage Solution
for at least one hour.
For refillable electrodes:
If the refill solution (electrolyte) is more than 2½ cm (1") 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.
TEST MEASUREMENT
Rinse the electrode tip with distilled water. Immerse the tip (bottom
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 the solution to be tested, before taking
any measurements.
STORAGE
To minimize clogging and assure a quick response time, the glass
bulb and the junction should be kept moist at any time and not
allowed to dry out.
When not in use, replace the solution in the protective cap with a few
drops of
HI 70300
Storage Solution.
Follow the Preparation Procedure above before taking measurements.
NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. The cable used for the 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 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 Storage Procedure above.
CLEANING PROCEDURE
General
Soak in Hanna
HI 7061
General Cleaning Solu-
tion for approximately 30 minutes.
Removal of films, dirt or deposits on the membrane/junction:
Protein
Soak in Hanna
HI 7073
Protein Cleaning Solu-
tion for 15 minutes.
ELECTRODE CONDITIONING AND
MAINTENANCE
PREPARATION
Remove the protective cap.
DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT. This is
normal with electrodes and they will disappear when rinsed with
water.
During transport tiny bubbles of air may have formed 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.
* Only available with refillable electrodes.
