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ROSS Ultra, ROSS Ultra Triode and ROSS pH Electrodes
Thermo Scientific Orion
pH sensing bulb
Reference junction
ROSS
internal
reference
Gel solution
chamber
ROSS Gel-filled Combination pH
Electrode
Sample Requirements
A benefit of the ROSS pH electrodes is that the fill solution composition
may be changed depending on the sample requirements. The ROSS
pH electrode fill solution, Cat. No. 810007, is 3 M KCl. For solutions
that precipitate in the presence of chloride ions, the electrode can be
filled with 10% KNO
3
, Cat. No. 900003.
Electrodes with an epoxy body should only be used in aqueous
solutions.
Electrodes with a glass body may be used in non-aqueous solutions
and solutions that contain organic solvents. A minimum of 20% water
must be present in the sample for the best measurement results. If
there is a great deal of drift when using the ROSS electrode filled with
ROSS fill solution, try filling the electrode with a mixture of methanol
Preparation for Gel-Filled ROSS Ultra Triode
Electrodes
1. Remove the electrode storage bottle from the sensing bulb and
save it for later storage of the electrode.
Note:
Unscrew the cap on the electrode storage bottle before
removing the electrode.
2. Clean any salt deposits from the exterior of the electrode by rinsing
it with distilled water.
3. Connect the electrode to the meter.
4. If the electrode will not be used immediately, soak it in ROSS
pH electrode storage solution, Cat. No. 810001, or standard pH
electrode storage solution, Cat. No. 910001.
