Teledyne 200E - Page 7

M200E Documentation Model 200E Instruction Manual
8.8. Certification of Working Standards .............................................................................. 138
8.8.1. Certification Procedures of Working Standards ........................................................ 139
8.8.1.1. Other Methods of Establishing Traceability ....................................................... 139
8.9. References............................................................................................................... 139
9. INSTRUMENT MAINTENANCE ........................................................................................ 141
9.1. Maintenance Schedule ............................................................................................... 141
9.2. Predictive Diagnostics................................................................................................ 143
9.3. Maintenance Procedures ............................................................................................ 143
9.3.1. Changing the Sample Particulate Filter .................................................................. 144
9.3.2. Changing the O
3
Dryer Particulate Filter................................................................. 145
9.3.3. Changing the Ozone Filter Chemical ...................................................................... 146
9.3.4. Rebuilding the External Sample Pump ................................................................... 147
9.3.5. Changing the Pump and IZS Dust Filters................................................................ 148
9.3.6. Changing the IZS Permeation Tube ....................................................................... 148
9.3.7. Changing the External Zero Air Scrubber ............................................................... 149
9.3.8. Changing the NO
2
converter................................................................................. 150
9.3.9. Cleaning the Reaction Cell ................................................................................... 151
9.3.10. Cleaning or Changing Critical Flow Orifices ........................................................... 153
9.3.11. Checking for Light Leaks.................................................................................... 154
10. THEORY OF OPERATION .............................................................................................. 155
10.1. Measurement Principle............................................................................................. 155
10.1.1. Chemiluminescence .......................................................................................... 155
10.1.2. NO
X
and NO
2
Determination................................................................................ 156
10.1.3. Chemiluminescence Detection ............................................................................ 157
10.1.3.1. The Photo Multiplier Tube ............................................................................ 157
10.1.3.2. Optical Filter.............................................................................................. 158
10.1.4. Auto Zero ........................................................................................................ 158
10.1.5. Measurement Interferences................................................................................ 159
10.1.5.1. Direct Interference ..................................................................................... 159
10.1.5.2. Third Body Quenching................................................................................. 159
10.1.5.3. Light Leaks................................................................................................ 161
10.2. Pneumatic Operation ............................................................................................... 161
10.2.1. Pump and Exhaust Manifold ............................................................................... 161
10.2.2. Sample Gas Flow .............................................................................................. 162
10.2.3. Sample Particulate Filter .................................................................................... 163
10.2.4. Ozone Gas Air Flow........................................................................................... 164
10.2.5. O
3
Generator ................................................................................................... 164
10.2.6. Perma Pure
®
Dryer ........................................................................................... 165
10.2.7. Ozone Supply Air Filter ...................................................................................... 166
10.2.8. Ozone Scrubber................................................................................................ 167
10.2.9. Flow Rate Control - Critical Flow Orifices .............................................................. 167
10.2.10. Pneumatic Sensors.......................................................................................... 170
10.2.10.1. Sample Pressure Sensor ............................................................................ 170
10.2.10.2. Vacuum Pressure Sensor ........................................................................... 170
10.2.10.3. O
3
Supply Air Flow Sensor ......................................................................... 170
10.3. Electronic Operation ................................................................................................ 171
10.3.1. CPU ................................................................................................................ 172
10.3.1.1. Disk On Chip ............................................................................................. 173
10.3.1.2. Flash Chip ................................................................................................. 173
10.3.2. Sensor Module, Reaction Cell & PMT .................................................................... 173
10.3.2.1. Reaction Cell Heating Circuit ........................................................................ 173
10.3.2.2. Photo Multiplier Tube (PMT) ......................................................................... 174
10.3.2.3. PMT Cooling System ................................................................................... 174
10.3.2.4. TEC Control Board ...................................................................................... 175
10.3.2.5. PMT Preamplifier ........................................................................................ 175
10.3.3. Pneumatic Sensor Board .................................................................................... 176
10.3.4. Relay Board ..................................................................................................... 177
10.3.4.1. Heater Control ........................................................................................... 177
10.3.4.2. Valve Control............................................................................................. 177
10.3.4.3. Status LEDs............................................................................................... 177
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