Agilent Technologies 5975T LTM GC/MSD, Troubleshooting And Maintenance Manual

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200 Troubleshooting and Maintenance Guide
13
Analyzer
Overview
The analyzer ( Figure 30 ) 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 30 ):
• Ion source
• Mass filter
• Detector
• Heaters and radiators