MAX300-RTG : Hardware Manual Hardware Maintenance
70
Figure 44: Quadrupole Collar Shield
Using the flat blade screwdriver, remove the four 2-56 pan head screws used to
secure the ionizer end collar shield plate, visible on the right of Figure 44, above.
Remove the collar shield by sliding the remaining components out of the detector
end of the mass filter assembly. This is best performed by grasping the remaining
collar shield plate and gently pulling. Locating pins are incorporated into the
detector end plate to limit rotation of the assembly with respect to the quadrupole.
These pins will pull out of the mass filter collar without any additional disassembly.
(To clean the shield rod assembly, it is convenient to remove the four shield rods
from the detector end by removing the remaining four pan head screws.) The wires
connecting opposing poles can be left in place.
Note: Under no circumstances should the screws holding the quadrupole rods
to the ceramic collars be removed, adjusted or checked for tightness.
Quadrupole Cleaning
Required Tools
(1) ¾ to 1-inch diameter bottle brush with the wire “knot” removed from the
end and the handle covered in plastic.
(~5) Cotton Swabs
Small amount of Pumice
Small amount of Alconox
Hair Dryer
(2) Lint-free Tissue Paper Wipes
(1) Pair Powder-free Latex Gloves
A source of clean tap water
Distilled water (most convenient in a lab style wash bottle)
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