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C Bus ...............................................................................................................................................279
12.5.4. Touchscreen Interface .......................................................................................................................280
12.5.5. LCD Display Module ..........................................................................................................................280
12.5.6. Relay Board .......................................................................................................................................280
12.5.7. Sensor Assembly ...............................................................................................................................281
12.5.7.1. Sync/Demodulator Assembly .....................................................................................................281
12.5.7.2. Electrical Test .............................................................................................................................281
12.5.7.3. Opto Pickup Assembly ...............................................................................................................282
12.5.7.4. GFC Wheel Drive .......................................................................................................................282
12.5.7.5. IR Source ....................................................................................................................................282
12.5.7.6. Pressure/Flow Sensor Assembly ...............................................................................................283
12.5.8. Motherboard .......................................................................................................................................284
12.5.8.1. A/D Functions .............................................................................................................................284
12.5.8.2. Test Channel / Analog Outputs Voltage .....................................................................................284
12.5.8.3. Analog Outputs: Current Loop ....................................................................................................285
12.5.8.4. Status Outputs ............................................................................................................................286
12.5.8.5. Control Inputs - Remote Zero, Span ..........................................................................................286
12.5.9. CPU ....................................................................................................................................................287
12.5.10. RS-232 Communications .................................................................................................................287
12.5.10.1. General RS-232 Troubleshooting .............................................................................................287
12.5.10.2. Troubleshooting Analyzer/Modem or Terminal Operation .......................................................288
12.6. Repair Procedures ...................................................................................................................................289
12.6.1. Repairing Sample Flow Control Assembly ........................................................................................289
12.6.2. Removing/Replacing the GFC Wheel ................................................................................................290
12.6.3. Checking and Adjusting the Sync/Demodulator, Circuit Gain (CO MEAS) ......................................292
12.6.3.1. Checking the Sync/Demodulator Circuit Gain ............................................................................292
12.6.3.2. Adjusting the Sync/Demodulator, Circuit Gain ...........................................................................293
12.6.4. Disk-On-Module Replacement ...........................................................................................................294
12.7. Frequently Asked Questions ...................................................................................................................295
12.8. Technical Assistance ...............................................................................................................................296
13. THEORY OF OPERATION .............................................................................................. 297
13.1. Measurement Method ..............................................................................................................................297
13.1.1. Beer's Law .........................................................................................................................................297
13.2. Measurement Fundamentals ...................................................................................................................298
13.2.1. Gas Filter Correlation .........................................................................................................................299
13.2.1.1. The GFC Wheel ..........................................................................................................................299
13.2.1.2. The Measure Reference Ratio ...................................................................................................300
13.2.1.3. Summary Interference Rejection ................................................................................................303
13.3. Flow Rate Control ....................................................................................................................................304
13.3.1.1. Critical Flow Orifice .....................................................................................................................305
13.3.2. Particulate Filter .................................................................................................................................306
13.3.3. Pneumatic Sensors ............................................................................................................................306
13.3.3.1. Sample Pressure Sensor ...........................................................................................................306
13.3.3.2. Sample Flow Sensor ..................................................................................................................306
13.4. Electronic Operation ................................................................................................................................306
13.4.1. CPU ....................................................................................................................................................309
13.4.1.1. Disk-On-Module (DOM) ..............................................................................................................309
13.4.1.2. Flash Chip ..................................................................................................................................309
13.4.2. Optical Bench & GFC Wheel .............................................................................................................310
13.4.2.1. Temperature Control ..................................................................................................................310
13.4.2.2. IR Source ....................................................................................................................................310
13.4.2.3. GFC Wheel .................................................................................................................................310
13.4.2.4. IR Photo-Detector .......................................................................................................................312
13.4.3. Synchronous Demodulator (Sync/Demod) Assembly .......................................................................312
13.4.3.1. Signal Synchronization and Demodulation ................................................................................313
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Sensor ................................................................................................................288
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Teledyne API - Model T300/T300M CO Analyzer
06864B DCN6314
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Table of Contents
Troubleshooting
