Metrohm 944 Professional UV/VIS Detector Vario - Manual (Page 40)

6.7 Cleaning the flow-through cell
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944 Professional UV/VIS Detector Vario (2.944.0010)
2 Removing the lens
￭ Loosen the retaining screw (12-1) with a slotted screwdriver, size
5, and remove it.
Remove the seal from the inside of the retaining screw (12-2).
￭ Carefully remove the lens (12-3) and the inner seal (12-4) from
the measuring cell.
￭ Put the lens onto a white paper, this allows you to see possible
deposits.
3 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.
4 Reinserting the lens
￭ Insert a new inner seal (12-4) into the measuring cell; make sure
that it lies flat and centered in the recess of the measuring cell.
￭ Reinsert the lens (12-3) with its flat side facing inwards; make
sure that it lies flat and centered in the recess of the measuring
cell.
￭ Insert a new outer seal into the retaining screw (12-2).
￭ Reinsert the retaining screw (12-1) and tighten it with a slotted
screwdriver, size 5.
5 Cleaning the second lens
Repeat steps 2 to 4 on the opposite side of the cell holder.
6 Reinserting the flow-through cell
Follow steps 3 and 4 of "Installing the flow-through cell", page 16.