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Table of Contents Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 14
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
2
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
2
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