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M360E Documentation Model 360E Instruction Manual
10.2.1. Sample Gas Flow ...............................................................................................................................................168
10.2.2. Flow Rate Control...............................................................................................................................................169
10.2.2.1. Critical Flow Orifice.....................................................................................................................................169
10.2.3. Purge Gas Pressure Control...............................................................................................................................170
10.2.4. Particulate Filter..................................................................................................................................................170
10.2.5. Pneumatic Sensors.............................................................................................................................................170
10.2.5.1. Sample Pressure Sensor............................................................................................................................170
10.2.5.2. Sample Flow Sensor...................................................................................................................................170
10.3. Electronic Operation...................................................................................................................................................171
10.3.1. Overview.............................................................................................................................................................171
10.3.2. CPU....................................................................................................................................................................173
10.3.3. Optical Bench & GFC Wheel ..............................................................................................................................173
10.3.3.1. Temperature Control...................................................................................................................................173
10.3.3.2. IR Source....................................................................................................................................................173
10.3.3.3. GFC Wheel .................................................................................................................................................174
10.3.3.4. IR Photo-Detector .......................................................................................................................................175
10.3.4. Synchronous Demodulator (Sync/Demod) Assembly.........................................................................................175
10.3.4.1. Overview.....................................................................................................................................................175
10.3.4.2. Signal Synchronization and Demodulation..................................................................................................176
10.3.4.3. Sync/Demod Status LED’s..........................................................................................................................177
10.3.4.4. Photo-Detector Temperature Control..........................................................................................................178
10.3.4.5. Dark Calibration Switch...............................................................................................................................178
10.3.4.6. Electric Test Switch.....................................................................................................................................178
10.3.5. Relay Board........................................................................................................................................................178
10.3.5.1. Status LED’s ...............................................................................................................................................179
10.3.5.2. I
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C Watch Dog Circuitry..............................................................................................................................180
10.3.6. Mother Board......................................................................................................................................................180
10.3.6.1. A to D Conversion.......................................................................................................................................180
10.3.6.2. Sensor Inputs..............................................................................................................................................180
10.3.6.3. Thermistor Interface....................................................................................................................................181
10.3.6.4. Analog Outputs ...........................................................................................................................................181
10.3.6.5. Internal Digital I/O .......................................................................................................................................182
10.3.6.6. External Digital I/O......................................................................................................................................182
10.3.7. I
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C Data Bus.......................................................................................................................................................182
10.3.8. Power Supply/ Circuit Breaker............................................................................................................................183
10.4. Interface .....................................................................................................................................................................184
10.4.1. Front Panel Interface ..........................................................................................................................................184
10.4.1.1. Analyzer Status LED’s ................................................................................................................................185
10.4.1.2. Keyboard.....................................................................................................................................................185
10.4.1.3. Display........................................................................................................................................................185
10.4.1.4. Keyboard/Display Interface Electronics.......................................................................................................186
10.5. Software Operation.....................................................................................................................................................188
10.5.1. Adaptive Filter.....................................................................................................................................................188
10.5.2. Calibration - Slope and Offset.............................................................................................................................189
10.5.3. Measurement Algorithm......................................................................................................................................189
10.5.4. Temperature and Pressure Compensation.........................................................................................................189
10.5.5. Internal Data Acquisition System (iDAS) ............................................................................................................190
11. TROUBLESHOOTING & REPAIR PROCEDURES...........................................................................................................191
11.1. General Troubleshooting Hints...................................................................................................................................191
11.1.1. Interpreting WARNING Messages......................................................................................................................192
11.1.2. Fault Diagnosis with TEST Functions.................................................................................................................194
11.1.3. Using the Diagnostic Signal I/O Function ...........................................................................................................196
11.1.4. Internal Electronic Status LED’s .........................................................................................................................197
11.1.4.1. CPU Status Indicator ..................................................................................................................................197
11.1.4.2. Sync Demodulator Status LED’s.................................................................................................................197
11.1.4.3. Relay Board Status LED’s...........................................................................................................................198
11.2. Gas Flow Problems....................................................................................................................................................200
11.2.1. M360E Internal Gas Flow Diagrams...................................................................................................................200
11.2.2. Typical Sample Gas Flow Problems...................................................................................................................202
11.2.2.1. Flow is Zero ................................................................................................................................................202
11.2.2.2. Low Flow.....................................................................................................................................................203
11.2.2.3. High Flow....................................................................................................................................................203
11.2.2.4. Displayed Flow = “XXXX”............................................................................................................................203
11.2.2.5. Actual Flow Does Not Match Displayed Flow..............................................................................................203
11.2.2.6. Sample Pump .............................................................................................................................................204
vi 05232 Rev B3