User Guide

Instruction Manual pH 510/ Ion 510

6 pH ELECTRODE MAINTENANCE

pH electrodes are susceptible to dirt and contamination and need to be cleaned regularly depending on the

extent and condition of use. Refer to Section 6.3 for more details on cleaning pH electrode.

6.1 Storage

For best result, always keep the pH electrode bulb wet, preferably with the use of storage solution. pH 4 buffer

is also acceptable as a storage medium. Do not store in deionized water. The protective rubber cap or

container filled with the buffer solution provides ideal storage for long periods.

6.2 After Use

After measurement is complete, follow the sequence below for storage.

a) Wash the electrode and reference junction in de-ionized water

b) If using a refillable electrode, close the refilling hole by returning its rubber sleeve or stopper cap into

position.

c) Store the electrode as mentioned above (see Storage).

6.2.1 Electrolyte Replacement (for refillable electrodes only)

The reference electrolyte needs to be refilled when the pH electrode has been used for an extended period, or

when the internal electrolyte has dried up. To accomplish this, follow the procedure:

1. Remove the protective rubber cap or sleeve to expose the filling port of the electrode. Remove the old

reference electrolyte by flushing out with a syringe and a flexible tube.

2. Add in fresh electrolyte until it reaches the level of the refilling port. The reference electrolyte depends on

your electrode. For double junction or Calomel electrodes, the electrolyte should be 4M KCl (EC-RE001/

05992-48). Replace the rubber sleeve.

Sleeve

Rubber

Stopper

3. Rinse the liquid junction with de-ionized water and gently tap dry.

NOTE

If these steps fail to restore normal electrode response, you may attempt to rejuvenate it. (See: 6.4 pH

Electrode Rejuvenation).