Thermo Finnigan LTQ - Page 111

MS Detector Maintenance
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_______________________ Finnigan LTQ Hardware Manual ______________________
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Ion detection system Clean ion detection
system (electron
multiplier and
conversion dynode)
Whenever the top
cover plate of the
vacuum manifold is
removed
Page 4-36
Mass analyzer Clean mass analyzer
2
Very rarely (if ever)
1
Page 4-38
Rotary-vane pump Add oil If oil level is low Manufacturer’s
documentation
Rotary-vane pump Change oil Every 3 months or if oil
is cloudy or discolored
Manufacturer’s
documentation
Ion detection system Replace electron
multiplier assembly
2
If noise in spectrum is
excessive or proper
electron multiplier gain
can not be achieved
Page 4-39
Turbomolecular pump Replace
turbomolecular pump
insert
2
Every 20,000 to 30,000
hours or if bearings fail
Page 4-43
Electronic modules Replace electronic
module
2
If electronic module
fails
Diagnostics and PCB
and Assembly
Replacement chapter
PCBs Replace PCB
2
If PCB fails Diagnostics and PCB
and Assembly
Replacement chapter
1
Frequency depends on analytical conditions
2
We recommend that this maintenance procedure be performed by a Thermo Electron Field Service Engineer
Table 4-1. MS detector maintenance procedures, continued
MS Detector
Component
Procedure Frequency Procedure Location