Hardware manual

4-88 Agilent 7500 Series ICP-MS Hardware Manual
4Maintenance
Refitting the Plate Bias Lens
To install the Plate Bias Lens in the vacuum chamber, start with the plate bias
lens. This must be installed before installing the Einzel lens- Omega lens
assembly. Otherwise, it will be impossible to install the plate bias lens.
To install the plate bias lens, wear gloves and complete the following steps:
1 Install the plate bias lens and the QP focus guide to the vacuum chamber.
Install the plate bias lens in the orientation as shown in Figure 76.
2 Fix the plate bias lens and the QP focus guide with Screw #1.
Tighten Screw #1 firmly.
After finishing the installation of the plate bias lens, refit the Einzel
lens- Omega lens assembly.
Refitting the Einzel Lens - Omega Lens Assembly
It is easiest to reattach the two sets of lenses in the reverse order of
disassembly. Therefore, if cleaning all three sets of lenses, reassemble the
Einzel Lens - Omega lens first.
To refit the Einzel Lens - Omega lens assembly, wear gloves and complete the
following steps:
1 Reassemble the Einzel Lens - Omega lens assembly.
To reassemble, complete the following steps:
1 Insert two shafts into the QP focus (back) in the position shown in
Figure 74. Perfectly insert them so the shaft brim fits into the groove of
the QP focus (back). Put this on the skimmer wrench so the shaft is
vertical to the tools. Continue assembly using this as a stand.
2 Put the parts into the shaft one by one.
Refer to Figure 74. The concave surface of the lenses should be up for
assembly. Do not insert spacer 1 between the QP focus (back) and the QP
focus (front) or between the base plate and spacer 3.