Thermo Fisher Scientific CyberScan pH/Ion 510 - Manual (Page 25)

Instruction Manual pH 510/ Ion 510
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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).