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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. H
2
S Conversion........................................................................................................... 243
10.1.2. SO
2
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 & H
2
S SO
2
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. SO
2
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