Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 6)

Model 9110EH Instruction Manual M9110EH Documentation
8.7.2. Precision Check .................................................................................................. 142
8.7.3. Precision Check Procedure ................................................................................... 142
8.8. Certification of Working Standards .............................................................................. 142
8.8.1. Certification Procedures of Working Standards ........................................................ 143
8.8.1.1. Other Methods of Establishing Traceability ....................................................... 143
8.9. References............................................................................................................... 143
9. INSTRUMENT MAINTENANCE ........................................................................................ 145
9.1. Maintenance Schedule ............................................................................................... 145
9.2. Predictive Diagnostics................................................................................................ 147
9.3. Maintenance Procedures ............................................................................................ 147
9.3.1. Changing the Sample Particulate Filter .................................................................. 148
9.3.2. Changing the O
3
Dryer Particulate Filter................................................................. 149
9.3.3. Changing the Ozone Filter Chemical ...................................................................... 150
9.3.4. Rebuilding the External Sample Pump ................................................................... 151
9.3.5. Changing the Pump and IZS Dust Filters ................................................................ 152
9.3.6. Changing the IZS Permeation Tube ....................................................................... 152
9.3.7. Changing the External Zero Air Scrubber ............................................................... 153
9.3.8. Changing the NO
2
converter................................................................................. 154
9.3.9. Cleaning the Reaction Cell ................................................................................... 155
9.3.10. Cleaning or Changing Critical Flow Orifices ........................................................... 157
9.3.11. Checking for Light Leaks.................................................................................... 158
10. THEORY OF OPERATION .............................................................................................. 159
10.1. Measurement Principle............................................................................................. 159
10.1.1. Chemiluminescence .......................................................................................... 159
10.1.2. NO
X
and NO
2
Determination................................................................................ 160
10.1.3. Chemiluminescence Detection ............................................................................ 161
10.1.3.1. The Photo Multiplier Tube ............................................................................ 161
10.1.3.2. Optical Filter.............................................................................................. 162
10.1.4. Auto Zero ........................................................................................................ 162
10.1.5. Measurement Interferences................................................................................ 163
10.1.5.1. Direct Interference ..................................................................................... 163
10.1.5.2. Third Body Quenching................................................................................. 163
10.1.5.3. Light Leaks................................................................................................ 165
10.2. Pneumatic Operation ............................................................................................... 165
10.2.1. Pump and Exhaust Manifold ............................................................................... 165
10.2.2. Sample Gas Flow .............................................................................................. 166
10.2.3. Sample Particulate Filter .................................................................................... 167
10.2.4. Ozone Gas Air Flow ........................................................................................... 168
10.2.5. O
3
Generator ................................................................................................... 168
10.2.6. Perma Pure ® Dryer ........................................................................................... 169
10.2.7. Ozone Supply Air Filter ...................................................................................... 170
10.2.8. Ozone Scrubber................................................................................................ 171
10.2.9. Flow Rate Control - Critical Flow Orifices .............................................................. 171
10.2.10. Pneumatic Sensors.......................................................................................... 173
10.2.10.1. Vacuum Manifold ...................................................................................... 173
10.2.10.2. Sample Pressure Sensor ............................................................................ 174
10.2.10.3. Vacuum Pressure Sensor ........................................................................... 174
10.2.10.4. O
3
Supply Air Flow Sensor ......................................................................... 174
10.2.11. Dilution Manifold............................................................................................. 175
10.3. Electronic Operation ................................................................................................ 175
10.3.1. CPU ................................................................................................................ 176
10.3.1.1. Disk On Chip ............................................................................................. 177
10.3.1.2. Flash Chip ................................................................................................. 178
10.3.2. Sensor Module, Reaction Cell & PMT .................................................................... 178
10.3.2.1. Reaction Cell Heating Circuit ........................................................................ 178
10.3.2.2. Photo Multiplier Tube (PMT) ......................................................................... 178
10.3.2.3. PMT Cooling System ................................................................................... 179
10.3.2.4. TEC Control Board ...................................................................................... 179
10.3.2.5. PMT Preamplifier ........................................................................................ 180
10.3.3. Pneumatic Sensor Board .................................................................................... 181
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