Hardware manual

4-86 Agilent 7500 Series ICP-MS Hardware Manual
4Maintenance
2 Remove the plate bias lens.
Remove the screw fixing the plate bias lens and the QP focus guide (Screw
1), and remove the QP focus guide and the plate bias (Figure 76). Put the
plate bias lens on a clean surface. Put the cover on the vacuum chamber
after removing the lens.
Figure 76 Plate Bias Lens
Cleaning the Lenses
The extraction, Einzel, Omega, and plate bias lenses can be cleaned separately
or together. Complete the following steps:
1 Clean each lens orifice.
Polish the orifice of each lens with 400 grade polishing paper, which is
provided in the maintenance kit, until any discoloration is removed.
Polishing must be performed on the entire surface of the lenses; especially
the inner surface of the holes where the ion beam passes through. Cleaning
the entire surface of the extraction lens is difficult, so just cleaning the
inner and outer conical surfaces is acceptable. Clean the entire curved
surface of the Omega(+) and Omega(- ) lens. Be careful not to deform the tip
of the extraction lenses by mishandling it.
Plate Bias Lens
QP Focus Guide
Screw 1