5. Maintenance
5.4Interference filters
5.5Other optical surfaces
5.6Instrument housing
5.7Lamp and optical system test
8.Insert the new cell, being careful not to touch either of the optical surfaces. See that the inlet and outlet ports are correctly aligned.
9.Retighten the screw washers with the tool provided. Do not use excessive force.
10.Check for leakage.
11.Replace the black cover.
Reference out Sample out
Reference in Sample in
Fig. 13. Flow cell interior showing tubing connections.
For optimum performance, it is essential that the interference filters are clean and free of any particulate material. Do not touch the interference filters. Should the filter become contaminated with dust,finger prints or oil, proceed as follows:
-Carefully take out the filter without touching or scratching the surface.
-Use lens cleaning tissue dipped in ethanol to gently clean both sides of the filter surface.
-Place the clean filter back to the
-Interference filters should never be exposed to temperatures above 60 °C
Clean all other optical surfaces by wiping the surface with clean, lint- free cloth, moistened with carbon tetrachloride, ethanol, or another suitable pure solvent.
Wipe the instrument regularly with a damp cloth. Let the instrument dry completely before use.
Before performing this test see that the filter is clean, that the cell is clean and free of bubbles or particles and that the cell holder is correctly inserted and locked in position.
1.Insert the aperture and filter for 254 nm operation or the converter and filter for 280 nm operation.
2.Set AU / %T to % T.
3.Set the recorder to the 100 mV range.
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