MAX300-RTG : Hardware Manual Hardware Maintenance
74
hex wrench. Use the ohmmeter to check that the ionizer lenses are isolated from
one another, the vacuum chamber, and the quadrupole. If the detector mounting
flange was removed, it will need to be re-attached using a new 4-1/2 inch copper
gasket and the 1/4 inch hex key for the securing socket head screws. Position the
detector mounting flange so that the HV feedthrough is towards the back of the
vacuum chamber. Use the ohmmeter to check that the detector connection
feedthrough(s) are isolated from both the vacuum chamber and the quadrupole
rods.
Detector
Two different detector options are offered. The standard detector is the faraday
plate. This component, located directly after the quadrupole, collects the signal of
the ions. An optional electron multiplier detector assembly is available for
increased dynamic range. It is recommended that the standard faraday detector
be wiped off occasionally, especially for dirty applications. Figure 48 below shows
the faraday detector.
Figure 48: Faraday Detector
Electron Multiplier Removal and Replacement
Required Tools
1/4 inch Hex Key
3/32 inch Hex Key
Note: a “ball end” type is most convenient.
(1) 4-1/2 inch Copper Gasket
Pair Lint Free or Nylon Gloves
#2 Phillips Screwdriver
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