Introduction
Certain maintenance tasks are performed only when conditions require them, and cleaning the UV-VIS detector is one of the most important examples. Over time, contamination, deposits or air-bubbles can affect optical performance and compromise signal quality. This article outlines Metrohm's recommended as needed maintenance procedure for cleaning a UV-VIS detector on an ion chromatography system, explaining when cleaning is warranted and how proper handling helps restore detector performance, protect sensitive components, and ensure reliable analytical results.
Note: To open the measuring cell, you will need a slotted screwdriver size 5. Seals part number: 6.2764.000.
Removing the Flow-Through Cell
- Disconnect the inlet capillary and outlet capillary.
- Loosen the knurled screws and remove them.
- Remove the flow-through cell from the cell holder.
Removing the Lens
- Loosen the retaining screw (15-1) with a slotted screwdriver size 5 and remove it.
- Remove the seal from the inside of the retaining screw (15-2).
- Carefully remove the lens (15-3) and the inner seal (15-4) from the measuring cell.
- Put the lens onto a white paper. This allows you to see possible deposits.
Cleaning the Lens
- Clean the lens with ultrapure water, methanol or another suitable solvent (depending on the application) and wipe with a lint-free cloth.
- Rinse again with ultrapure water and dry with a lint-free cloth.
Re-inserting the Lens
- Insert a new inner seal (15-4) into the measuring cell, making sure that it lies flat and centered in the recess of the measuring cell.
- Insert the lens (15-3) with its flat side into the measuring cell, making sure that it lies flat and centered in the recess of the measuring cell.
- Inset a new outer seal (15-2).
- Insert the retaining screw (15-1) and tighten it with a slotted screwdriver size 5.
Additional Support
If you encounter any issues or need additional help, please submit a support ticket through Metrohm Technical Support.
For additional training on any of these topics, explore our available Metrohm Ion Chromatography Training courses or learn more about our Metrohm Custom Training options.