Milkotester Master Series Operation Manual page 2

Appendices towards the Operation Manual of Ultrasonic milk analyzer Master
Storage
For best results, always keep the pH bulb wet. An optimal storage solution for
combination electrode is pH 4 buffer with 225 grams of KCl per liter. Table salt, NaCl, can be
used if KCl is not really available. Other pH buffers or tap water are also acceptable storage
media, but avoid storage in de-ionized water. The protective rubber cap filled with the buffer
solution provides ideal storage for long periods.
After Use
After measurement is completed, follow the sequence below for storage.
- Wash the electrode and reference junction in de-ionized water.
- Close the refilling hole by returning its rubber sleeve or stopper cap.
(Necessary for only refillable electrode).
- Store the electrode as mentioned above (see section Storage).
Electrolyte Replacement (for refillable electrode only)
The reference electrolyte needs to be refilled when the electrode has been used for a
long period, or when the internal electrolyte has dried up. To accomplish this, follow the
procedure described below.
- Remove the protective rubber cap or sleeve;
- Remove the protective rubber sleeve to expose the filling port of the electrode;
- Remove the old reference electrolyte with a syringe;
- Fill the new reference electrolyte.