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Table of Contents Teledyne API – Technical Manual - Model 300E Family CO Analyzers
xiv
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 M300E/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. M300E/EM Internal Gas Flow Diagrams .......................................................................................... 278
04288D DCN5752