User's Manual

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 a faster response, unscrew the fill hole screw during measure-

ments.

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 (bottom 4

cm /1½") 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

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

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

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

double junction electrodes). Follow the Preparation Procedure above

before taking measurements.

Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WA-

TER.

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 the reference chamber with fresh electrolyte (HI 7071 or HI 8071

for single junction or HI 7082 or HI 8082 for double junction elec-

trodes). Allow the electrode to stand upright for 1 hour.

Follow the Storage Procedure above.