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Table of Contents Teledyne API – Model T400 Photometric Ozone Analyzer
xviii
13.1.4. Interferent Rejection ......................................................................................................................... 279
13.2. Pneumatic Operation ............................................................................................................................... 280
13.2.1. Sample Gas Air Flow ........................................................................................................................ 280
13.2.2. Flow Rate Control ............................................................................................................................. 281
13.2.2.1. Critical Flow Orifice.................................................................................................................... 281
13.2.3. Particulate Filter................................................................................................................................ 282
13.2.4. Pneumatic Sensors........................................................................................................................... 282
13.2.4.1. Sample Pressure Sensor .......................................................................................................... 282
13.2.4.2. Sample Flow Sensor ................................................................................................................. 282
13.3. Electronic Operation................................................................................................................................. 283
13.3.1. Overview........................................................................................................................................... 283
13.3.2. CPU .................................................................................................................................................. 284
13.3.2.1. Disk-On-Module......................................................................................................................... 285
13.3.2.2. Flash Chip ................................................................................................................................. 285
13.3.3. Motherboard...................................................................................................................................... 286
13.3.3.1. A to D Conversion ..................................................................................................................... 286
13.3.3.2. Sensor Inputs ............................................................................................................................ 286
13.3.3.3. Thermistor Interface .................................................................................................................. 286
13.3.3.4. Analog Outputs.......................................................................................................................... 287
13.3.3.5. External Digital I/O..................................................................................................................... 287
13.3.3.6. I
2
C Data Bus.............................................................................................................................. 287
13.3.3.7. Power Up Circuit........................................................................................................................ 288
13.3.4. Relay PCA ........................................................................................................................................ 288
13.3.4.1. Status LEDs............................................................................................................................... 290
13.3.4.2. Watchdog Circuitry .................................................................................................................... 290
13.3.4.3. Valve Control............................................................................................................................. 291
13.3.4.4. Heater Control ........................................................................................................................... 291
13.3.4.5. Thermocouple Inputs and Configuration Jumper (JP5) ............................................................ 292
13.3.5. Power Supply/Circuit Breaker........................................................................................................... 293
13.3.5.1. Power Switch/Circuit Breaker.................................................................................................... 294
13.3.6. AC Power Configuration ................................................................................................................... 295
13.3.6.1. AC Configuration – Internal Pump (JP7)................................................................................... 296
13.3.6.2. AC Configuration – Heaters for Option Packages (JP6) ........................................................... 297
13.3.7. Photometer Layout and Operation.................................................................................................... 298
13.3.7.1. Photometer Electronic Operation .............................................................................................. 299
13.3.7.2. O
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Photometer UV Lamp Power Supply ................................................................................... 300
13.3.7.3. Photometer Temperature .......................................................................................................... 301
13.3.7.4. Photometer Gas Pressure and Flow Rate................................................................................. 301
13.4. Front Panel Touchscreen/Display Interface............................................................................................. 302
13.4.1. Front Panel Interface PCA................................................................................................................ 302
13.5. Software Operation .................................................................................................................................. 303
13.5.1. Adaptive Filter................................................................................................................................... 303
13.5.2. Calibration - Slope and Offset........................................................................................................... 304
14. A PRIMER ON ELECTRO-STATIC DISCHARGE......................................................... 305
14.1. How Static Charges are Created ............................................................................................................. 305
14.2. How Electro-Static Charges Cause Damage........................................................................................... 306
14.3. Common Myths About ESD Damage ...................................................................................................... 307
14.4. Basic Principles of Static Control ............................................................................................................. 308
14.4.1. General Rules................................................................................................................................... 308
14.4.2. Basic anti-ESD Procedures for Analyzer Repair and Maintenance ................................................. 310
14.4.2.1. Working at the Instrument Rack ................................................................................................ 310
14.4.2.2. Working at an Anti-ESD Work Bench........................................................................................ 310
14.4.2.3. Transferring Components from Rack to Bench and Back......................................................... 311
14.4.2.4. Opening Shipments from Teledyne API Customer Service ...................................................... 311
14.4.2.5. Packing Components for Return to Teledyne API Customer Service....................................... 312
06870C DCN6332