Perkin-Elmer Lambda 20, Installation And Maintenance Manual

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Lambda 20, Lambda 40 UV/Vis Spectrometers
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8. If the radiation beam is not centered exactly, loosen the two locking screws and
the two milled posts on the relevant cell holder and shift the cell holder plate to
center the radiation beam horizontally.
Then retighten the two milled posts and the two locking screws.
9. Now visually check the vertical alignment of the radiation beam in the cell
sample area.
Alignment is correct when the radiation beam is just above the floor of the cell
sample area (min. 2 mm) or covers the cell window.
NOTE: The center of the window for micro flowcells should be ideally approximately
15 mm above the base of the cell.
Figure 7 Correct Alignment of the Radiation Beam in the Cell Sample Area
10. If vertical alignment is required, turn the vertical adjustment screw on the lifter
either clockwise to raise the cell, or counterclockwise to lower the cell.
11. Recheck the horizontal alignment of the radiation beam through the cell and
correct if necessary.
12. Using the [GOTO] key, slew the monochromator to any value above 200 nm.
13. Remove the card blocking the sample beam window and close the sample
compartment cover.
Min. 2 mm
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