Agilent Technologies 5975C TAD VL MSD Troubleshooting And Maintenance Manual page 138

4
General Maintenance
Procedure
The filaments, source heater assembly, and insulators cannot be cleaned
CA UT IO N
ultrasonically. Replace these components if major contamination occurs.
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All of these solvents are hazardous. Work in a fume hood and take all appropriate
WARNING
precautions.
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If the contamination is serious, such as an oil backflow into the analyzer,
seriously consider replacing the contaminated parts.
Abrasively clean the surfaces that contact the sample or ion beam.
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.
Rinse away all abrasive residue with reagent-grade methanol.
all
Make sure abrasive residue is rinsed way
the methanol becomes cloudy or contains visible particles, rinse again.
Separate the parts that were abrasively cleaned from the parts that were
not abrasively cleaned.
Ultrasonically clean the parts (each group separately) for 15 minutes in
each of the following solvents:
•
Methylene chloride (reagent-grade)
•
Acetone (reagent-grade)
•
Methanol (reagent-grade)
Place the parts in a clean beaker.
aluminum foil (dull side down).
Dry the cleaned parts in an oven at 100 °C for 5–6 minutes.
Loosely
5975 Series MSD Troubleshooting and Maintenance Manual
before
ultrasonic cleaning. If
cover the beaker with clean