Teledyne API – T101 Operation Manual TABLE OF CONTENTS
xiii
9.5.12. PMT Sensor................................................................................................................ 232
9.5.13. PMT Preamplifier Board................................................................................................ 232
9.5.14. PMT Temperature Control PCA.......................................................................................232
9.5.15. High Voltage Power Supply........................................................................................... 233
9.5.16. Pneumatic Sensor Assembly..........................................................................................233
9.5.16.1. Sample Pressure................................................................................................... 233
9.5.17. IZS Option .................................................................................................................233
9.5.18. Box Temperature ........................................................................................................ 234
9.5.19. PMT Temperature........................................................................................................ 234
9.6. Repair Procedures ...............................................................................................................234
9.6.1. Disk-on-Module Replacement.......................................................................................... 234
9.6.2. Adjusting the UV Lamp (Peaking the Lamp) ......................................................................235
9.6.3. Replacing the UV Lamp.................................................................................................. 237
9.6.4. Factory Cal (PMT Sensor, Hardware Calibration)................................................................ 238
9.7. Frequently Asked Questions (FAQs)........................................................................................240
9.8. Technical Assistance ............................................................................................................241
10. PRINCIPLES OF OPERATION.................................................................................................. 243
10.1. Measurement Principle .......................................................................................................243
10.1.1. H2S Conversion........................................................................................................... 243
10.1.2. SO2 Ultraviolet Fluorescence ......................................................................................... 244
10.2. The UV Light Path.............................................................................................................. 247
10.2.1. UV Source Lamp ......................................................................................................... 247
10.2.2. The Reference Detector................................................................................................ 248
10.2.3. The PMT.....................................................................................................................248
10.2.4. Optical Filters .............................................................................................................249
10.2.4.1. UV Source Optical Filter......................................................................................... 249
10.2.4.2. PMT Optical Filter.................................................................................................. 249
10.2.5. Optical Lenses ............................................................................................................250
10.2.6. Measurement Interferences .......................................................................................... 251
10.2.6.1. Direct Interference................................................................................................ 251
10.2.6.2. UV Absorption by Ozone ........................................................................................252
10.2.6.3. Dilution ...............................................................................................................252
10.2.6.4. Third Body Quenching............................................................................................252
10.2.6.5. Light Pollution ......................................................................................................252
10.3. Pneumatic Operation.......................................................................................................... 253
10.3.1. Sample Gas Flow.........................................................................................................254
10.3.2. Multigas Measurement & H2S SO2 Switching Valve........................................................ 255
10.3.3. Flow Rate Control........................................................................................................ 255
10.3.3.1. Critical Flow Orifice ...............................................................................................255
10.3.4. Sample Particulate Filter...............................................................................................256
10.3.5. Hydrocarbon Scrubber (Kicker) ..................................................................................... 257
10.3.6. SO2 Scrubber.............................................................................................................. 257
10.3.7. Pneumatic Sensors...................................................................................................... 258
10.3.7.1. Sample Pressure Sensor ........................................................................................258
10.3.7.2. Sample Flow Sensor.............................................................................................. 258
10.4. Electronic Operation........................................................................................................... 259
10.4.1. CPU...........................................................................................................................261
10.4.1.1. Disk On Module (DOM) ..........................................................................................261
10.4.1.2. Flash Chip............................................................................................................261
10.4.2. Sensor Module & Sample chamber................................................................................. 262
10.4.3. Sample Chamber Heating Circuit ...................................................................................262
10.4.4. Photo Multiplier Tube (PMT).......................................................................................... 263
10.4.5. PMT Cooling System.................................................................................................... 264
10.4.5.1. Thermoelectric Cooler (TEC)................................................................................... 264
10.4.5.2. TEC Control Board.................................................................................................265
10.4.6. PMT Preamplifier......................................................................................................... 265
10.4.7. Pneumatic Sensor Board...............................................................................................267
10.4.8. Relay Board................................................................................................................267
10.4.8.1. Heater Control...................................................................................................... 267
10.4.8.2. Valve Control ....................................................................................................... 267
10.4.9. Status LEDs & Watch Dog Circuitry ................................................................................ 268
10.4.10. Motherboard............................................................................................................. 269
07266B DCN6485