User Guide

pH ELECTRODE CONDITIONING

& MAINTENANCE

Preparation

Remove the protective cap.

DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT. This is

normal with pH electrodes and they will disappear when rinsed with

water.

During transportation tiny air bubbles may have formed inside the glass

bulb (membrane). Shake down the electrode, as you would do with a

glass thermometer to remove the bubbles.

If the bulb and/or junction are dry, soak the electrode overnight in HI

70300 Storage Solution.

Storage

To minimize noise 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.

This can be achieved by installing the electrode in such a way that it is

constantly in a well filled with the sample.

When not in use, pour a few drops of HI 70300 Storage Solution or HI

7007 pH 7.01 Buffer Solution in the protective cap and place it on the

electrode.

NEVER USE DISTILLED OR DEIONIZED WATER FOR STORING PURPOSES.

Periodic maintenance

Rinse off any salt deposits with water.

Inspect the electrode and the cable. The electrode connection cable must

be intact. There must be no points of broken insulation on the cable or

cracks on the electrode stem or bulb. If any scratches or cracks are

present, replace the electrode.

The connector must be perfectly clean and dry.

Cleaning procedure

Soak the electrode in HI 7061 General Cleaning Solution for approxi-

mately half an hour.

For a more specific cleaning procedure, refer to the electrode’s instruction

manual.

Note: After performing a cleaning procedure, rinse the electrode thor-

oughly with distilled water and recalibrate the controller.