MS Detector Maintenance
Cleaning the Q0 and Q1 Ion Guides
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______________________ Finnigan LTQ Hardware Manual _______________________
4.5 Cleaning the Q0 and Q1 Ion Guides
An accumulation of chemicals on the surfaces of the Q0 and Q1 ion guides
forms an insulating layer that can modify the electrical fields that control ion
transmission. Therefore, clean ion guide components are essential for the
proper operation of the instrument. The Q0 and Q1 ion guides require
cleaning less frequently than the Q00 ion guide. The frequency of cleaning
depends on the type and quantity of the compounds that you analyze.
Cleaning or replacing Q0 and Q1 ion guide components involves the
following steps:
•
Shut down and vent the system
•
Remove the top cover of the MS detector
•
Remove the top cover plate of the vacuum manifold
•
Remove the Q0 and Q1 ion guides
•
Clean the Q0 quadrupole, Q1 octapole, lens L1, and gate lens
•
Reinstall the Q0 and Q1 ion guides
•
Reinstall the top cover plate of the vacuum manifold
•
Reinstall the top cover of the MS detector
•
Start up the system
Shutting Down the System
Shut down and vent the system as described in the topic Shutting Down the
System Completely in the System Shutdown, Startup, and Reset chapter.
Go on to the next topic: Removing the Top Cover of the MS Detector.
Removing the Top Cover of the MS Detector
Remove the top cover of the MS detector as follows:
1. Open the front door of the MS detector by loosening the Allen screw on
the right side of the door with an Allen wrench.
2. Remove the top cover of the MS detector:
a.
Loosen the two fasteners that hold the top cover to the MS detector
chassis. The fasteners are located in the upper right and left corners of
the chassis.
b. Slide the top cover forward by about 1.2 cm (0.5 in.).
CAUTION. Make sure that the LTQ power cord is unplugged before you
proceed.
