Lambda 20/Lambda 40 Installation and Maintenance Guide - VTP UP

Lambda 20, Lambda 40 UV/Vis Spectrometers8. If the radiation beam is not centered exactly, loosen the two locking screws andthe two milled posts on the relevant cell holder and shift the cell holder plate tocenter 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 cellsample area.Alignment is correct when the radiation beam is just above the floor of the cellsample area (min. 2 mm) or covers the cell window.NOTE: The center of the window for micro flowcells should be ideally approximately15 mm above the base of the cell.Min. 2 mmFigure 7 Correct Alignment of the Radiation Beam in the Cell Sample Area10. If vertical alignment is required, turn the vertical adjustment screw on the liftereither clockwise to raise the cell, or counterclockwise to lower the cell.11. Recheck the horizontal alignment of the radiation beam through the cell andcorrect 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 samplecompartment cover.32