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

M9110E Documentation Model 9110E Instruction Manual
vi M9110E Rev B
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