Agilent Technologies 7000 Series Operating Manual page 175

7 General Maintenance
To Clean the EI XTR Source
.
If insulators are dirty, clean them with a cotton swab dampened with
C AU T I O N
reagent-grade methanol. If that does not clean the insulators, replace them. Do
not abrasively or ultrasonically clean the insulators.
The filaments, source heater assembly, and insulators cannot be cleaned
C AU T I O N
ultrasonically. Replace these components if major contamination occurs.
Repeller Repeller block
insert
Figure 55. EI XTR source parts to be cleaned


Procedure
1 If the contamination is serious, such as an oil backflow into the analyzer,
2 Abrasively clean the surfaces that contact the sample or ion beam.
7000/7010 Series TQ GC/MS Operating Manual
Entrance lens Ion focus lens
seriously consider replacing the contaminated parts.
Use an abrasive slurry of alumina powder and reagent-grade methanol on a
cotton swab. Use enough force to remove all discolorations. Polishing the
parts is not necessary; small scratches will not harm performance. Also
abrasively clean the discolorations where electrons from the filaments
enter the source body.
Extractor lens Source body
175