Hanna Instruments HI 2550 User Manual

Page 52

For refillable electrodes:

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

For AMPHEL

electrodes:

If the electrode does not respond to pH changes, the battery is run down

and the electrode should be replaced.
MEASUREMENT

MEASUREMENT

MEASUREMENT
Rinse the pH 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.
Take care that the sleeve holes of the EC probe are completely submersed.

Tap the probe repeatedly to remove air bubbles that may be trapped

inside the sleeve.
STORAGE PROCEDURE

STORAGE PROCEDURE

STORAGE PROCEDURE
To minimize clogging and assure a quick response time, the glass bulb

and the junction of pH electrode should be kept moist and not allowed to

dry out.
Replace the solution in the protective cap with a few drops of HI 70300

or 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 on page

53 before taking measurements.
Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.
PERIODIC MAINTENANCE

PERIODIC MAINTENANCE

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.
pH Electrode Maintenance
For refillable electrodes:

For refillable electrodes:

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.