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Table of Contents M703E Calibrator Operator’s Manual
9.2.4. Motherboard........................................................................................................................................ 143
9.2.4.1. A to D Conversion ....................................................................................................................... 143
9.2.4.2. Sensor Inputs .............................................................................................................................. 143
9.2.4.3. Thermistor Interface .................................................................................................................... 143
9.2.4.4. Analog Outputs............................................................................................................................ 143
9.2.4.5. External Digital I/O....................................................................................................................... 144
9.2.4.6. I
2
C Data Bus................................................................................................................................ 144
9.2.4.7. Power-up Circuit.......................................................................................................................... 144
9.2.5. Power Supply and Circuit Breaker...................................................................................................... 145
9.2.6. AC Power Configuration ..................................................................................................................... 146
9.2.6.1. AC configuration – Internal Pump (JP7)...................................................................................... 146
9.3. Front Panel Interface ................................................................................................................................ 147
9.3.1.1. Calibrator Status LEDs................................................................................................................ 148
9.3.1.2. Keyboard ..................................................................................................................................... 148
9.3.1.3. Display......................................................................................................................................... 148
9.3.1.4. Keyboard/Display Interface Electronics....................................................................................... 149
9.4. Software Operation ................................................................................................................................... 150
9.5. O
3
generator operation............................................................................................................................. 151
9.5.1. Principle of Photolytic O
3
Generation ................................................................................................. 151
9.5.2. Generator Pneumatic Operation......................................................................................................... 152
9.5.3. O
3
Generator Electronic Operation ..................................................................................................... 152
9.5.3.1. O
3
Generator Temperature Control............................................................................................. 154
9.6. Photometer Operation............................................................................................................................... 155
9.6.1. Measurement Method......................................................................................................................... 155
9.6.1.1. Calculating O
3
Concentration ...................................................................................................... 155
9.6.1.2. The Measurement / Reference Cycle.......................................................................................... 156
9.6.1.3. The Absorption Path.................................................................................................................... 158
9.6.1.4. Interferent Rejection .................................................................................................................... 158
9.6.2. Photometer Layout.............................................................................................................................. 159
9.6.3. Photometer Pneumatic Operation ...................................................................................................... 159
9.6.4. Photometer Electronic Operation........................................................................................................ 160
9.6.4.1. O
3
Photometer Temperature Control .......................................................................................... 160
9.6.4.2. Pneumatic Sensors for the O
3
Photometer ................................................................................. 161
10. MAINTENANCE SCHEDULE & PROCEDURES .......................................................... 163
10.1. Maintenance Schedule ........................................................................................................................... 163
10.2. Performing Leak Checks ........................................................................................................................ 167
10.2.1. Pressure Leak Check ....................................................................................................................... 167
10.3. Cleaning or replacing the Absorption Tube............................................................................................ 171
10.4. Rebuilding the Dry Air Pump .................................................................................................................. 171
10.5. Photometer UV Source Lamp Adjustment.............................................................................................. 172
10.6. Photometer UV Source Lamp Replacement .......................................................................................... 173
10.7. Adjustment or Replacement of Ozone Generator UV Lamp .................................................................. 174
11. GENERAL TROUBLESHOOTING & REPAIR OF THE M703E CALIBRATOR ........... 177
11.1. General Troubleshooting ........................................................................................................................ 177
11.1.1. Fault Diagnosis with WARNING Messages...................................................................................... 178
11.1.2. Fault Diagnosis With Test Functions ................................................................................................ 180
11.1.3. Using the Diagnostic Signal I/O Function......................................................................................... 182
11.2. Using the Analog Output Test Channel.................................................................................................. 183
11.3. Using the Internal Electronic Status LEDs.............................................................................................. 184
11.3.1. CPU Status Indicator ........................................................................................................................ 184
11.3.2. Relay PCA Status LEDs ................................................................................................................... 184
11.3.2.1. I
2
C Bus Watchdog Status LEDs ................................................................................................ 184
11.3.2.2. O
3
Status LEDs ......................................................................................................................... 185
11.4. Subsystem Checkout.............................................................................................................................. 186
11.4.1. Verify Subsystem Calibration............................................................................................................ 186
11.4.2. AC Main Power................................................................................................................................. 186
11.4.3. DC Power Supply.............................................................................................................................. 187
vi 05744 Rev B