Thermo Scientific VH-D20 Operating Manual page 7

6 Operation................................................................................... 85
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10 Optimizing the Performance of the Device........................................................ 107
6.11 Shutting Down the Device ................................................................................. 114
7 Maintenance and Service ......................................................... 119
7.1
7.2
7.3
Charged Aerosol Detectors (VH-D20, VF-D20)
Operating Manual
Introduction to this Chapter ................................................................................ 86
Safety Guidelines for Operation........................................................................... 87
Control Elements ................................................................................................. 89
6.3.1 Keypad...................................................................................................... 89
6.3.2 Status Indicators....................................................................................... 90
Power On/Off Control.......................................................................................... 92
Preparing the Device for Operation..................................................................... 93
Mobile Phase Guidelines for the Detector........................................................... 96
6.6.1 General Guidelines ................................................................................... 96
6.6.2 Mobile Phase Selection ............................................................................ 97
6.6.3 Mobile Phase Delivery System ................................................................. 98
6.6.4 Additives................................................................................................... 99
Setting the Nebulizer Gas Pressure and the Nebulizer Serial Number .............. 101
Turning On/Off the Detector Gas Flow .............................................................. 102
Important Operating Parameters ...................................................................... 104
6.10.1 General Guidelines ................................................................................. 107
6.10.2 Overview of Optimization Parameters................................................... 108
6.10.3 Data Collection Rate and Filter Constant ............................................... 108
6.10.4 Signal Channels ...................................................................................... 109
6.10.5 Evaporation Temperature ...................................................................... 110
6.10.6 Gas Regulation Mode (VH-D20 Detector only) ...................................... 112
6.10.7 Power Function Value ............................................................................ 112
6.10.8 Baseline Noise ........................................................................................ 113
6.11.1 Short-Term Shutdown (Interruption of Operation) ............................... 114
6.11.2 Long-Term Shutdown............................................................................. 115
6.11.3 Restart after Long-Term Shutdown........................................................ 117
Introduction to Maintenance and Service ......................................................... 120
Safety Guidelines for Maintenance and Service ................................................ 121
General Rules for Maintenance and Service...................................................... 123
Contents
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