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Teledyne GFC-7001E - Trace CO Analyzer User Manual

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Table of Contents

Model GFC7001E Carbon Dioxide Analyzer

Teledyne Analytical Instruments

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11.5.4.1. Overview .....................................................................................................................................242

11.5.4.2. Signal Synchronization and Demodulation ................................................................................243

11.5.4.3. Sync/Demod Status LED’s .........................................................................................................244

11.5.4.4. Photo-Detector Temperature Control .........................................................................................244

11.5.4.5. Dark Calibration Switch ..............................................................................................................244

11.5.4.6. Electric Test Switch ....................................................................................................................245

11.5.5. Relay Board .......................................................................................................................................245

11.5.5.1. Heater Control ............................................................................................................................245

11.5.5.2. GFC Wheel Motor Control: .........................................................................................................245

11.5.5.3. Zero/Span Valve Options ...........................................................................................................245

11.5.5.4. IR Source ....................................................................................................................................245

11.5.5.5. Status LED’s ...............................................................................................................................246

11.5.5.6. I

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C Watch Dog Circuitry ..............................................................................................................246

11.5.6. MotherBoard ......................................................................................................................................247

11.5.6.1. A to D Conversion ......................................................................................................................247

11.5.6.2. Sensor Inputs .............................................................................................................................247

11.5.6.3. Thermistor Interface ...................................................................................................................247

11.5.6.4. Analog Outputs ...........................................................................................................................248

11.5.6.5. Internal Digital I/O .......................................................................................................................248

11.5.6.6. External Digital I/O ......................................................................................................................248

11.5.7. I

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C Data Bus ......................................................................................................................................249

11.5.8. Power Supply/ Circuit Breaker ...........................................................................................................249

11.5.9. Communication Interface ...................................................................................................................251

11.5.10. Front Panel Interface .......................................................................................................................252

11.5.10.1. Analyzer Status LED’s ..............................................................................................................252

11.5.10.2. Keyboard ..................................................................................................................................252

11.5.10.3. Display ......................................................................................................................................253

11.5.10.4. Keyboard/Display Interface Electronics....................................................................................253

11.5.11. Software Operation ..........................................................................................................................256

11.5.12. Adaptive Filter ..................................................................................................................................256

11.5.13. Calibration - Slope and Offset ..........................................................................................................257

11.5.14. Measurement Algorithm ...................................................................................................................257

11.5.15. Temperature and Pressure Compensation ......................................................................................257

11.5.16. Internal Data Acquisition System (iDAS) .........................................................................................257

12. MAINTENANCE SCHEDULE & PROCEDURES .......................................................... 259

12.1. Maintenance Schedule ..............................................................................................................................259

12.2. Predicting Failures Using the Test Functions ...........................................................................................263

12.3. Maintenance Procedures ..........................................................................................................................264

12.3.1. Replacing the Sample Particulate Filter .............................................................................................264

12.3.2. Rebuilding the Sample Pump ............................................................................................................264

12.3.3. Performing Leak Checks ....................................................................................................................265

12.3.3.1. Vacuum Leak Check and Pump Check ......................................................................................265

12.3.3.2. Pressure Leak Check .................................................................................................................265

12.3.4. Performing a Sample Flow Check .....................................................................................................266

12.3.5. Cleaning the Optical Bench ...............................................................................................................266

12.3.6. Cleaning Exterior Surfaces of the GFC 7001E/EM ...........................................................................266

13. TROUBLESHOOTING & REPAIR ................................................................................. 267

13.1. General Troubleshooting ...........................................................................................................................267

13.1.1. Fault Diagnosis with WARNING Messages .......................................................................................268

13.1.2. Fault Diagnosis with TEST Functions ................................................................................................270

13.1.3. DIAG  SIGNAL I/O: Using the Diagnostic Signal I/O Function ......................................................273

13.1.4. Internal Electronic Status LED’s ........................................................................................................274

13.1.4.1. CPU Status Indicator ..................................................................................................................274

13.1.4.2. Sync Demodulator Status LED’s ................................................................................................275

13.1.4.3. Relay Board Status LED’s ..........................................................................................................276

13.2. Gas Flow Problems ...................................................................................................................................278

13.2.1. GFC 7001E/EM Internal Gas Flow Diagrams ....................................................................................278