PHOTOVOLT TECHNICAL NOTE
Cleaning Of Cathode Solution Cell*
For The Aquatest CMA, 10, And 2010

1. Remove the cathode solution cell from the titration vessel and dispose of the catholyte (generator) solution.

2. Rinse the cell with water.

3. Plug up the small "breathing hole", located on the under-side of the ground-glass fitting, with a stopper or if unavailable, a wooden tooth-pick. This hole must be plugged up in order to create a vacuum in the cell.

4. Connect a vacuum line to the ground glass fitting on the cathode solution cell. The PHOTOVOLT CLEANING KIT, 4091004, has been manufactured for this purpose.

5. Place the cell in a small beaker containing approximately 50 cm3 of 75% nitric acid in water. Concentration is not critical.

6. A brownish-red layer of iodine and other impurities will form when the acid is drawn through the frit.

7. Draw the acid through the frit until it comes through clear.

8. Dispose of the acid and draw water through the frit followed by methanol.

9. Finally, draw through a small amount of vessel solution and discard.

10. At this point, place the cathode solution cell in the vessel and add the generator solution. The titration vessel is now ready for use.

*Also known as the generator cell.

1999-05-26