Teledyne GFC7000E instruction manual - page 6

Model GFC7000E Instruction Manual GFC7000E Documentation
04584 Rev A1 v
10.3. Electronic Operation...........................................................................................................161
10.3.1. Overview ...................................................................................................................161
10.3.2. CPU...........................................................................................................................163
10.3.3. Optical Bench & GFC Wheel...........................................................................................163
10.3.3.1. Sample Gas and GFC Temperature Control............................................................... 163
10.3.3.2. IR Source ............................................................................................................ 164
10.3.3.3. GFC Wheel........................................................................................................... 164
10.3.3.4. IR Photo-Detector................................................................................................. 165
10.3.4. Synchronous Demodulator (Sync/Demod) Assembly.........................................................165
10.3.4.1. Overview............................................................................................................. 165
10.3.4.2. Signal Synchronization and Demodulation ................................................................ 166
10.3.4.3. Phase Lock Warning.............................................................................................. 167
10.3.4.4. Sync/Demod Status LED’s...................................................................................... 167
10.3.4.5. Photo-Detector Temperature Control........................................................................168
10.3.4.6. Dark Calibration Switch..........................................................................................168
10.3.4.7. Electric Test Switch............................................................................................... 168
10.3.5. Relay Board................................................................................................................168
10.3.5.1. Status LED’s.........................................................................................................169
10.3.5.2. I2C Watch Dog Circuitry........................................................................................ 170
10.3.6. Mother Board..............................................................................................................170
10.3.6.1. A to D Conversion................................................................................................. 170
10.3.6.2. Sensor Inputs.......................................................................................................171
10.3.6.3. Thermistor Interface..............................................................................................171
10.3.6.4. Analog Outputs.....................................................................................................172
10.3.6.5. Internal Digital I/O................................................................................................ 172
10.3.6.6. External Digital I/O............................................................................................... 173
10.3.7. I2C Data Bus...............................................................................................................173
10.3.8. Power Supply/ Circuit Breaker....................................................................................... 173
10.4. Interface.......................................................................................................................... 174
10.4.1. Front Panel Interface................................................................................................... 175
10.4.1.1. Analyzer Status LED’s............................................................................................175
10.4.1.2. Keyboard............................................................................................................. 176
10.4.1.3. Display................................................................................................................176
10.4.1.4. Keyboard/Display Interface Electronics.....................................................................177
10.5. Software Operation............................................................................................................ 178
10.5.1. Adaptive Filter............................................................................................................ 179
10.5.2. Calibration - Slope and Offset........................................................................................179
10.5.3. Measurement Algorithm............................................................................................... 180
10.5.4. Temperature and Pressure Compensation....................................................................... 180
10.5.5. Internal Data Acquisition System (iDAS)......................................................................... 180
11. TROUBLESHOOTING & REPAIR PROCEDURES ........................................................................ 183
11.1. General Troubleshooting Hints............................................................................................. 183
11.1.1. Interpreting WARNING Messages................................................................................... 184
11.1.2. Fault Diagnosis with TEST Functions...............................................................................186
11.1.3. Using the Diagnostic Signal I/O Function.........................................................................188
11.1.4. Internal Electronic Status LED’s..................................................................................... 189
11.1.4.1. CPU Status Indicator............................................................................................. 189
11.1.4.2. Sync Demodulator Status LED’s.............................................................................. 190
11.1.4.3. Relay Board Status LED’s....................................................................................... 191
11.1.5. Gas Flow Problems...................................................................................................... 192
11.1.6. Typical Sample Gas Flow Problems.................................................................................193
11.1.6.1. Flow is Zero......................................................................................................... 193
11.1.6.2. Low Flow............................................................................................................. 193
11.1.6.3. High Flow ............................................................................................................194
11.1.6.4. Displayed Flow = “XXXX”....................................................................................... 194
11.1.6.5. Actual Flow Does Not Match Displayed Flow.............................................................. 194
11.1.6.6. Sample Pump....................................................................................................... 194
11.1.7. Poor or Stopped Flow of Purge Gas................................................................................ 194
11.2. Calibration Problems.......................................................................................................... 195
11.2.1. Miss-Calibrated........................................................................................................... 195