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Contents
Appendix B
xii
Prima PRO & Sentinel PRO Mass Spectrometers User Guide
Sample Pump (Sentinel PRO Applications) ........................... A-21
Fibre Optic Communications .................................................. A-21
Service Replacement Items ........................................................ A-21
Troubleshooting ......................................................................... A-23
Standards Conformance ............................................................. A-25
Technical Description: Hardware ...................................... B-1
Introduction to the Prima PRO Hardware .................................... B-1
Main Components ..................................................................... B-1
Principle of Operation .................................................................. B-2
Vacuum System ........................................................................... B-4
Ion Source .................................................................................... B-5
Filaments ................................................................................... B-7
Mass Analyser .............................................................................. B-9
Collector ....................................................................................... B-9
Ion Detection .............................................................................. B-10
MCP Detector Assembly ........................................................ B-10
MCP Operation ....................................................................... B-11
Faraday Detector ..................................................................... B-13
Introduction of a Gas Sample .................................................... B-13
Mass Spectrometer Parameters .................................................. B-15
Sensitivity ............................................................................... B-15
Resolution ............................................................................... B-15
Cracking Patterns ....................................................................... B-17
Ion Types ................................................................................ B-17
Molecular Ion ....................................................................... B-17
Isotope Ions .......................................................................... B-17
Fragment Ions ...................................................................... B-18
Multiple-Charged Ions ......................................................... B-18
Rearrangement and Recombination Peaks........................... B-18
Definitions............................................................................... B-19
Rapid Multi-Stream Sampler (RMS) ........................................... C-1
Introduction ............................................................................... C-1
Safety ........................................................................................ C-1
Inlet Specification ..................................................................... C-2
Inlet Operation .......................................................................... C-3
General Description ............................................................... C-3
Connection to the Mass Spectrometer ................................... C-4
Seals ....................................................................................... C-4
Inlet Selection ........................................................................ C-5
Calibration Gas Control ......................................................... C-5
Gas Connection ...................................................................... C-6
Exhaust Connection ............................................................... C-7
Heating ................................................................................... C-8
Hazardous Area Systems ....................................................... C-9
Inlet Controller ........................................................................ C-10
General ................................................................................. C-10
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