Chapter 7 Troubleshooting and diagnostics ................................................................................. 57
7.1 Troubleshooting, repairs, and failure diagnostics .......................................................................57
7.2 Using the Built-in-Test (BIT) fault diagnostics .............................................................................59
7.3 Visual examination .................................................................................................................... 64
7.4 Failure diagnostics ..................................................................................................................... 65
7.5 Repairable items ........................................................................................................................68
7.6 Tools and test equipment required for troubleshooting .............................................................68
7.7 Removing the top cover .............................................................................................................69
7.8 Removing the bottom cover ...................................................................................................... 72
7.9 Replacing the LCD display ..........................................................................................................73
7.10 Replacing the USB circuit board ................................................................................................. 76
7.11 Replacing the power socket fuses .............................................................................................. 80
7.12 Replacing the internal fuses ....................................................................................................... 82
7.13 Replacing the fans ..................................................................................................................... 87
7.14 Replacing the terminal electric cooler (TEC) board .....................................................................89
7.15 Replacing the peripheral PCA board ...........................................................................................92
7.16 Replacing the motherboard .......................................................................................................95
7.17 Replacing the DIN Rail ................................................................................................................98
7.17.1 Replacing the analog input unit ...................................................................................98
7.17.2 Replacing the DC power supply .................................................................................101
7.17.3 Replacing the temperature controller ....................................................................... 102
7.17.4 Replacing the Ethernet switch ...................................................................................104
7.17.5 Replacing the laser modules ......................................................................................107
7.18 Replacing the gas temperature sensor .....................................................................................110
7.19 Replacing the pressure sensor ..................................................................................................112
7.20 Replacing the thermal cut-out ................................................................................................. 114
7.21 Replacing the gas input line ..................................................................................................... 117
7.22 Replacing the gas output line ...................................................................................................119
7.23 Replacing the analysis cell ........................................................................................................121
7.24 Cleaning the analysis cell mirrors ............................................................................................. 124
7.25 Installing the Top Cover ........................................................................................................... 127
7.26 Installing the bottom cover ......................................................................................................127
7.27 Downloading data for diagnostics and service ......................................................................... 128
7.27.1 Downloading data to a USB flash drive ...................................................................... 128
7.27.2 Downloading data using TFTP .................................................................................. 133
Chapter 8 Shutdown procedure ................................................................................................. 139
8.1 Shutdown procedure safety precautions .................................................................................139
8.2 Shutdown procedure ............................................................................................................... 140
Chapter 9 Preventative maintenance ......................................................................................... 145
9.1 Maintaining the analyzer ..........................................................................................................145
9.2 Scheduled maintenance .......................................................................................................... 145
Appendices and reference
Appendix A Theory of Operation ................................................................................................... 147
A.1 Overview ................................................................................................................................. 147
A.2 Quantum Cascade Laser measurement principle ..................................................................... 147
A.3 Process analyzer - gas concentration measurements ............................................................... 148
Appendix B Spare parts list ........................................................................................................... 149
Contents
ii Rosemount CT5400