
Teledyne ML - T100 UV Fluorescence SO2 Analyzer
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9.3.3. Electronic Operation of the CO2Sensor..............................................................................................234
9.4. Pneumatic Operation................................................................................................................................235
9.4.1. Sample Gas Flow.................................................................................................................................235
9.4.2. Flow Rate Control................................................................................................................................236
9.4.3. Hydrocarbon Scrubber (Kicker) ...........................................................................................................237
9.4.4. Pneumatic Sensors..............................................................................................................................238
9.5. Electronic Operation.................................................................................................................................239
9.5.1. CPU......................................................................................................................................................241
9.5.2. Sensor Module.....................................................................................................................................242
9.5.3. Photo Multiplier Tube (PMT)................................................................................................................244
9.5.4. PMT Cooling System...........................................................................................................................246
9.5.5. PMT Preamplifier .................................................................................................................................247
9.5.6. Pneumatic Sensor Board.....................................................................................................................249
9.5.7. Relay Board .........................................................................................................................................249
9.5.8. Status LEDs & Watch Dog Circuitry ....................................................................................................250
9.5.9. Motherboard.........................................................................................................................................251
9.5.10. Analog Outputs ..................................................................................................................................252
9.5.11. External Digital I/O.............................................................................................................................253
9.5.12. I2C Data Bus ......................................................................................................................................253
9.5.13. Power up Circuit.................................................................................................................................253
9.5.14. Power Supply/ Circuit Breaker...........................................................................................................253
9.6. Front Panel/Display Interface...................................................................................................................255
9.6.1. LVDS Transmitter Board......................................................................................................................255
9.6.2. Front Panel Interface PCA...................................................................................................................255
9.7. Software Operation...................................................................................................................................256
9.7.1. Adaptive Filter......................................................................................................................................256
9.7.2. Calibration - Slope and Offset..............................................................................................................257
9.7.3. Temperature and Pressure Compensation (TPC) Feature .................................................................257
9.7.4. Internal Data Acquisition System (DAS)..............................................................................................258
10. TROUBLESHOOTING & REPAIR................................................................................. 259
10.1. General Troubleshooting .......................................................................................................................259
10.1.1. Fault Diagnostics with Warning Messages........................................................................................260
10.1.2. Fault Diagnosis with Test Functions..................................................................................................264
10.1.3. Using the Diagnostic Signal I/O Functions ........................................................................................265
10.2. Status LEDs.............................................................................................................................................267
10.2.1. Motherboard Status Indicator (Watchdog).........................................................................................267
10.2.2. CPU Status Indicators........................................................................................................................267
10.2.3. Relay Board Status LEDs..................................................................................................................268
10.3. Gas Flow Problems.................................................................................................................................268
10.3.1. Zero or Low Sample Flow..................................................................................................................268
10.3.2. High Flow...........................................................................................................................................269
10.4. Calibration Problems..............................................................................................................................269
10.4.1. Negative Concentrations....................................................................................................................269
10.4.2. No Response .....................................................................................................................................269
10.4.3. Unstable Zero and Span....................................................................................................................270
10.4.4. Inability to Span - No SPAN Button...................................................................................................270
10.4.5. Inability to Zero - No ZERO Button....................................................................................................271
10.4.6. Non-Linear Response........................................................................................................................271
10.4.7. Discrepancy Between Analog Output and Display............................................................................271
10.5. Other Performance Problems................................................................................................................272
10.5.1. Excessive noise .................................................................................................................................272
10.5.2. Slow Response..................................................................................................................................272
10.5.3. The Analyzer Doesn’t Appear on the LAN or Internet .......................................................................272
10.6. Subsystem Checkout..............................................................................................................................273
10.6.1. AC Power Configuration ....................................................................................................................273
10.6.2. DC Power Supply...............................................................................................................................274
10.6.3. I2C Bus...............................................................................................................................................275