158 Troubleshooting and Maintenance Manual
7 Analyzers and Collision Cell
Mass axis offset
Mass offset also controls the mass assignment.
• A higher offset yields higher mass assignment.
• Mass offset generally affects peaks equally at all masses.
Quadrupole maintenance
The mass filter requires no periodic maintenance. It should not be removed
from the radiator. If absolutely necessary (that is, if the only alternative is
replacement), the quadrupole can be cleaned. Cleaning must be performed by
Agilent Technologies service personnel.
Never put the quadrupole in an ultrasonic cleaner.
Never change the physical orientation of the quadrupole mass filter.
The fused-quartz quadrupole is fragile and will break if dropped or handled roughly.
The material in the cusps of the quadrupole is very hygroscopic. If exposed to water,
the quadrupole must be dried very slowly to prevent damage.
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