Hanna Instruments HI 2216 User Manual

Page 41

For refillable electrodes:

If the filling solution (electrolyte) is more than 2½ cm (1”) below the fill
hole, add

HI 7082 or HI 8082 3.5M KCl Electrolyte Solution for double

junction or

HI 7071 or HI 8071 3.5M KCl+AgCl Electrolyte Solution for

single junction electrodes.
For 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. Submerse the tip (3 cm /1¼”)
in the sample and stir gently for a few 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 PROCEDURE

To minimize clogging and assure 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

HI 80300 Storage Solution or, in its absence, Filling Solution

(

HI 7071 or HI 8071 for single junction and HI 7082 or HI 8082 for

double junction electrodes). Follow the Preparation Procedure before
taking measurements.

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

PERIODIC MAINTENANCE

Inspect the electrode and the cable. The cable used for connection to the
instrument 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 reference chamber with fresh electrolyte (

HI 7071 or HI 8071 for

single junction and

HI 7082 or HI 8082 for double junction electrodes).

Allow the electrode to stand upright for 1 hour.
Follow the Storage Procedure above.