Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 15)

Table of Contents Model 9110TH NOx Analyzer
Teledyne Analytical Instruments xv
7.2.1. 9110TH Internal Gas Flow Diagrams .................................................................................................................... 211
7.2.2. 9110TM Internal Gas Flow Diagrams ................................................................................................................... 214
7.2.3. Zero or Low Flow Problems .................................................................................................................................. 216
7.2.4. High Flow .............................................................................................................................................................. 218
7.2.5. Sample Flow is Zero or Low But Analyzer Reports Correct Flow ......................................................................... 219
7.3. Calibration Problems .................................................................................................................................................... 219
7.3.1. Negative Concentrations ...................................................................................................................................... 219
7.3.2. No Response ........................................................................................................................................................ 220
7.3.3. Unstable Zero and Span ....................................................................................................................................... 221
7.3.4. Inability to Span - No SPAN Button ...................................................................................................................... 221
7.3.5. Inability to Zero - No ZERO Button ....................................................................................................................... 222
7.3.6. Non-Linear Response ........................................................................................................................................... 222
7.3.7. Discrepancy Between Analog Output and Display ............................................................................................... 223
7.3.8. Discrepancy between NO and NO
X
Slopes .......................................................................................................... 223
7.4. Other Performance Problems ....................................................................................................................................... 224
7.4.1. Excessive Noise ................................................................................................................................................... 224
7.4.2. Slow Response ..................................................................................................................................................... 224
7.4.3. Auto Zero Warnings .............................................................................................................................................. 225
7.5. Subsystem Checkout ................................................................................................................................................... 226
7.5.1. Simple Leak Check using Vacuum and Pump ...................................................................................................... 226
7.5.2. Detailed Leak Check Using Pressure ................................................................................................................... 226
7.5.3. Performing a Sample Flow Check ........................................................................................................................ 227
7.5.4. AC Power Configuration ....................................................................................................................................... 228
7.5.5. DC Power Supply Test Points .............................................................................................................................. 233
7.5.6. I 2 C Bus ................................................................................................................................................................. 233
7.5.7. Touch Screen Interface ........................................................................................................................................ 234
7.5.8. LCD Display Module ............................................................................................................................................. 234
7.5.9. General Relay Board Diagnostics ......................................................................................................................... 234
7.5.10. Motherboard ....................................................................................................................................................... 235
7.5.11. CPU .................................................................................................................................................................... 237
7.5.12. RS-232 Communication ...................................................................................................................................... 238
7.5.13. PMT Sensor ........................................................................................................................................................ 239
7.5.14. PMT Preamplifier Board ..................................................................................................................................... 239
7.5.15. High Voltage Power Supply ................................................................................................................................ 239
7.5.16. Pneumatic Sensor Assembly .............................................................................................................................. 240
7.5.17. NO
2
Converter .................................................................................................................................................... 241
7.5.18. O
3
Generator ...................................................................................................................................................... 243
7.5.19. Box Temperature ................................................................................................................................................ 243
7.5.20. PMT Temperature ............................................................................................................................................... 244
7.6. Repair Procedures ....................................................................................................................................................... 245
7.6.1. Disk-on-Module Replacement .............................................................................................................................. 245
7.6.2. O
3
Generator Replacement .................................................................................................................................. 246
7.6.3. Sample and Ozone Dryer Replacement ............................................................................................................... 246
7.6.4. PMT Sensor Hardware Calibration ....................................................................................................................... 247
7.6.5. Replacing the PMT, HVPS or TEC ....................................................................................................................... 249
7.7. Removing / Replacing the Relay PCA from the Instrument .......................................................................................... 252
7.8. Frequently Asked Questions ........................................................................................................................................ 253
7.9. Technical Assistance .................................................................................................................................................... 254
8. Principles of Operation ......................................................................................................................................................... 256
8.1. Measurement Principle ................................................................................................................................................. 256
8.1.1. Chemiluminescence ............................................................................................................................................. 256
8.1.2. NO
X
and NO
2
Determination ................................................................................................................................. 258
8.2. Chemiluminescence Detection ..................................................................................................................................... 259
8.2.1. The Photo Multiplier Tube ..................................................................................................................................... 259
8.2.2. Optical Filter ......................................................................................................................................................... 259
8.2.3. Auto Zero .............................................................................................................................................................. 260
8.2.4. Measurement Interferences .................................................................................................................................. 261
8.3. Pneumatic Operation .................................................................................................................................................... 263
8.3.1. Pump and Exhaust Manifold ................................................................................................................................. 263
8.3.2. Sample Gas Flow ................................................................................................................................................. 264
8.3.3. Flow Rate Control - Critical Flow Orifices ............................................................................................................. 265
8.3.4. Sample Particulate Filter ....................................................................................................................................... 269
8.3.5. Ozone Gas Air Flow .............................................................................................................................................. 270
8.3.6. O
3
Generator ........................................................................................................................................................ 271
8.3.7. Perma Pure ® Dryer ............................................................................................................................................... 272