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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
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C 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
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C Bus ...............................................................................................................................................275
xiv
Teledyne ML - T100 UV Fluorescence SO2 Analyzer
Sensor ..............................................................................................234
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