Waters Xevo TQ-GC Overview And Maintenance Manual page 13

4.11 Working on the GC column ......................................................................................................... 94
4.11.1 Precautions and recommendations for working on the column ......................................... 97
4.12 Cleaning the instrument case...................................................................................................... 98
4.13 Replacing the gas cylinders ........................................................................................................ 98
4.14 Maintaining the rotary backing pump oil...................................................................................... 98
4.15 Gas-ballasting the rotary backing pump.................................................................................... 101
4.16 Replacing the rotary backing pump's demister element............................................................ 101
4.17 Replacing the instrument's fuses .............................................................................................. 101
5 Best practices for efficient operation ...................................................................102
5.1 GC injector and inlet.................................................................................................................... 102
5.2 Air leaks ...................................................................................................................................... 102
5.3 Contaminated sample ampule and reference gas line................................................................ 103
5.4 Contaminated source components ............................................................................................. 103
5.5 Air in the CI gas inlet line ............................................................................................................ 104
5.6 Repelling magnets on the outer source ...................................................................................... 104
6 Troubleshooting the Xevo TQ-GC .........................................................................105
6.1 System troubleshooting............................................................................................................... 105
6.2 Component hardware troubleshooting ........................................................................................ 105
6.2.1 No ion beam ...................................................................................................................... 105
6.2.2 Unstable or low-intensity ion beam.................................................................................... 106
6.2.3 Poor sensitivity with EI source ........................................................................................... 107
6.2.4 Poor sensitivity with CI source........................................................................................... 107
6.2.5 Poor analyzer vacuum ....................................................................................................... 108
6.2.6 Poor source vacuum.......................................................................................................... 109
6.2.7 Failure of rotary pump fuse................................................................................................ 109
6.2.8 Poor resolution................................................................................................................... 109
6.2.9 High noise levels in MRM analyses ................................................................................... 110
April 27, 2020, 715005564 Ver. 01 (previously released as Rev. A)
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