Instruction 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 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 (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 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 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 28 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.