MS Detector Maintenance
Replacing the Electron Multiplier
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4-40 ______________________ Finnigan LTQ Hardware Manual _______________________
high voltage feedthrough in the top cover plate and remove the electron
multiplier as a unit. (The anode remains in the anode feedthrough in the
top cover plate.)
6. Repeat steps 4 and 5 with the second electron multiplier.
7. Remove the anode shield (Figure 4-17).
8. Loosen the socket-head screw that secures the dual anode. Remove the
dual anode from the anode feedthrough.
9. Install a new dual anode (P/N 97055-20018) in the anode feedthrough in
the top cover plate. Secure the dual anode with the socket-head screw.
10. Reinstall the anode shield over the dual anode.
11. With one hand holding the high voltage tube and the other hand holding
the electron multiplier support, install the new electron multiplier
(P/N 96000-60036) on the top cover plate. Ensure that the high voltage
tube is properly inserted in the high voltage feedthrough and that the
screw holes in the electron multiplier support are aligned with the screw
holes in the top cover plate.
Caution. Be careful not to damage the surface of the electron multiplier
shield. The electron multiplier shield has been electropolished to prevent
field emission.
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