Agilent Technologies 5975C TAD VL MSD, Troubleshooting And Maintenance Manual

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198 5975 Series MSD Troubleshooting and Maintenance Manual
7
Analyzer
Overview
The analyzer ( Figure 43 ) is the heart of the MSD. It ionizes the sample, filters
the ions, and detects them. The sample components exiting the GC column
flow into the ion source. In the ion source, the sample molecules are ionized
and fragmented. The resulting ions are repelled from the ion source into the
quadrupole mass filter. The mass filter allows selected ions to pass through
the filter and strike the detector. The detector generates a signal current
proportional to the number of ions striking it.
The analyzer is attached to the vacuum side of the side plate. The side plate is
hinged for easy access. The ion source and the mass filter are independently
heated. Each is mounted inside a radiator for correct heat distribution.
Each of the parts of the analyzer is discussed in the following material.
The analyzer has four basic components
The analyzer consists of the following components ( Figure 43 ):
•
Ion source
•
Mass filter
•
Detector
•
Heaters and radiators