Agilent Technologies 3200P, User Manual, Page: 32 / 116

32 3200P pH Meter User Guide
2 Operation
Using the pH Meter
For best accuracy, perform the following procedures before
making measurements.
To prepare an electrode for use
A new electrode should be stored wet in the reference filling
solution (5190- 0545) and should be in working condition
when received. Used electrodes should be stored as
described in
“Electrode storage” on page 59.
1 Check the electrode for any mechanical damage. If the
storage bottle is dry, soak the electrode in reference filling
solution for at least 2 hours before use.
2
Take the storage bottle off and keep it for future use.
3
Check the measuring tip for solidified electrolyte. If
present, rinse off with distilled or deionized water.
4 Unplug the filling hole and add new reference filling
solution if necessary. Fill to at least 20 mm higher than
the level of sample. The liquid junction must be immersed
completely in solution.
•
To guarantee the movement of reference filling solution
during measurement, keep the filling hole open during
measurement.
5
Hold the electrode measuring tip downwards and swing it
several times to remove air bubbles near the sensitive
glass bulb.
6
Install the electrode into the electrode holder as shown in
Figure 2 on page 8. Put the electrode in the solution with
the measuring tip downwards.
Do not remove the short- circuit plug until after adjusting
mv zero.