Agilent Technologies MSD 5977B Series Operating Manual page 207

7 General Maintenance
To Clean an EI XTR, SS, or Inert Source


Procedure
The filaments, source heater assembly, and insulators cannot be cleaned
C AU T I O N
ultrasonically. Replace these components if major contamination occurs.
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.
3 Rinse away all abrasive residue with reagent-grade methanol.
4 Separate the parts that were abrasively cleaned from the parts that were not
All of these solvents are hazardous. Work in a fume hood and take all
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appropriate precautions.
5 Ultrasonically clean the parts (each group separately) for 15 minutes. For
6 Place the parts in a clean beaker.
7 Dry the cleaned parts in an oven at 100 °C for 5–6 minutes.
Let the parts cool before you handle them.
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5977B Series MSD Operating Manual
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.
all
Make sure abrasive residue is rinsed
methanol becomes cloudy or contains visible particles, rinse again three times.
abrasively cleaned.
dirty parts, use all three solvents in the order shown, cleaning 15 minutes with
each of the following solvents:
• Methylene chloride (reagent-grade)
• Acetone (reagent-grade)
• Methanol (reagent-grade)
For routine cleaning, cleaning with methanol is sufficient.
aluminum foil (dull side down).
before
ultrasonic cleaning. If the
Loosely
cover the beaker with clean
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