Waters GCT Premier - Page 12

xii Table of Contents
Reference reservoir inlet ................................................................................ 1-7
Vacuum system .................................................................................................. 1-7
MassLynx control system ................................................................................ 1-8
Controls and indicators on the instruments’ front panel ....................... 1-9
Status display .................................................................................................. 1-9
Controls on the instruments’ top panel ..................................................... 1-11
Controls and connectors on instruments’ rear panel ............................ 1-12
Signal connections ......................................................................................... 1-13
Vacuum and gas inlet connections................................................................ 1-18
Gas inlet connections..................................................................................... 1-19
EPC power switch.......................................................................................... 1-20
2 Preparing the instrument for EI/CI operation ............................... 2-1
Changing the EI/CI inner source assembly ................................................ 2-2
Removing the EI/CI inner source.................................................................... 2-3
Installing the EI/CI inner source.................................................................... 2-4
Changing the EI/CI outer source assembly ................................................ 2-6
Removing the EI/CI outer source from the instrument................................. 2-6
Fitting the EI/CI outer source to the instrument .......................................... 2-8
3 Tuning the Instrument ......................................................................... 3-1
Preparing the instrument for operation ..................................................... 3-2
Obtaining an ion beam .................................................................................... 3-3
Introducing the reference sample................................................................... 3-6
Setting up the instrument automatically .................................................... 3-8
Required material............................................................................................ 3-8
Tuning the instrument for EI ....................................................................... 3-19
General tips for tuning.................................................................................. 3-23
Tuning the instrument for best resolution in EI ..................................... 3-24
Tuning the instrument for positive CI ....................................................... 3-25
Introducing CI reagent gas ........................................................................... 3-26