YSI ScienceLine -- pHT - G - Manual (Page 7)

T 814244 04/2014 7
IoLine
ScienceLine Storage
• Immerse the combination electrode in the solution in a vertical or slightly
tilted position.
• Make sure the immersion depth is correct. The junction must be
completely submersed in the solution. At the same time, the level of the
reference electrolyte must be at least 2 cm above the level of the solution.
• Provide approximately the same stirring conditions for measuring as for
calibrating.
The frequency of subsequent calibrations depends on the application.
Many meters provide an option where you can enter a calibration interval.
After the calibration interval has expired, the meter will automatically
remind you of the due calibration.
Storage
With the refilling opening open, immerse the combination electrode in
in reference electrolyte (KCl 3 mol/L, Ag+ free). Observe the minimum depth
of immersion. Prior to the next measurement, shortly rinse the combination
electrode with the test sample or deionized water.
Note
Prevent contact of the pH membrane to the beaker bottom to avoid scratches
on the pH membrane.
Put the clean combination electrode in the watering cap that is filled with
reference electrolyte (KCl 3 mol/L, Ag
+
free) and close the refilling opening.
Overnight or
longer
Note
pH combination electrodes must not be stored dry or in deionized water. The
combination electrode could be permanently damaged by this. If the liquid in
the irrigation cap has dried up, condition the combination electrode in
reference electrolyte (KCl 3 mol/L, Ag+
+
free) for at least 24 hours.
Note
During longer storing periods, salt sediments may develop on the watering
cap. They do not affect the measuring characteristics and can easily be re-
moved with deionized water when the combination electrode is put into oper-
ation again.