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Teledyne API – Model T400 Photometric Ozone Analyzer Table of Contents
xvii
12.3. Using the Internal Electronic Status LEDs ............................................................................................... 253
12.3.1. CPU Status Indicator ........................................................................................................................ 253
12.3.2. Relay PCA Status LEDs ................................................................................................................... 253
12.3.2.1. I
2
C Bus Watchdog Status LEDs ................................................................................................ 253
12.3.2.2. O
3
Option Status LED s............................................................................................................. 254
12.4. Gas Flow Problems.................................................................................................................................. 255
12.4.1. Typical Flow Problems...................................................................................................................... 255
12.4.1.1. Flow is Zero ............................................................................................................................... 255
12.4.1.2. Low Flow ................................................................................................................................... 255
12.4.1.3. High Flow................................................................................................................................... 256
12.4.1.4. Actual Flow Does Not Match Displayed Flow ........................................................................... 256
12.4.1.5. Sample Pump............................................................................................................................ 256
12.5. Calibration Problems................................................................................................................................ 256
12.5.1. Mis-Calibrated................................................................................................................................... 256
12.5.2. Non-Repeatable Zero and Span....................................................................................................... 256
12.5.3. Inability to Span – No Span Button (CALS)...................................................................................... 257
12.5.4. Inability to Zero – No Zero Button (CALZ) ........................................................................................ 257
12.6. Other Performance Problems .................................................................................................................. 257
12.6.1. Temperature Problems ..................................................................................................................... 257
12.6.1.1. Box Temperature....................................................................................................................... 257
12.6.1.2. Sample Temperature................................................................................................................. 258
12.6.1.3. UV Lamp Temperature.............................................................................................................. 258
12.6.1.4. IZS Ozone Generator Temperature (Optional) ......................................................................... 258
12.7. Subsystem Checkout ............................................................................................................................... 259
12.7.1. AC Main Power................................................................................................................................. 259
12.7.2. DC Power Supply.............................................................................................................................. 259
12.7.3. I
2
C Bus.............................................................................................................................................. 260
12.7.4. Touchscreen Interface ...................................................................................................................... 261
12.7.5. LCD Display Module ......................................................................................................................... 261
12.7.6. Relay PCA ........................................................................................................................................ 261
12.7.7. Photometer Pressure /Flow Sensor Assembly ................................................................................. 262
12.7.8. Motherboard...................................................................................................................................... 263
12.7.8.1. Test Channel / Analog Outputs Voltage.................................................................................... 263
12.7.8.2. A/D Functions............................................................................................................................ 264
12.7.8.3. Status Outputs........................................................................................................................... 264
12.7.8.4. Control Inputs ............................................................................................................................ 265
12.7.9. CPU .................................................................................................................................................. 265
12.7.10. RS-232 Communications................................................................................................................ 266
12.7.10.1. General RS-232 Troubleshooting............................................................................................ 266
12.7.10.2. Troubleshooting Analyzer/Modem or Terminal Operation ...................................................... 266
12.8. Trouble Shooting the Photometer ............................................................................................................ 267
12.8.1. Checking Measure / Reference Valve .............................................................................................. 267
12.8.2. Checking The Photometer UV Lamp Power Supply......................................................................... 268
12.9. Trouble Shooting the IZS Options O
3
generator ...................................................................................... 269
12.9.1. Checking The O
3
Generator UV Lamp Power Supply...................................................................... 269
12.10. Service Procedures................................................................................................................................ 269
12.10.1. Repairing Sample Flow Control Assembly ..................................................................................... 269
12.10.2. Replacing The Standard Reference O
3
Scrubber .......................................................................... 270
12.10.3. Replacing the IZS O
3
Scrubber ...................................................................................................... 271
12.10.4. Metal Wool Scrubber Option........................................................................................................... 271
12.10.5. Disk-On-Module Replacement Procedure...................................................................................... 271
12.11. FAQ’s ..................................................................................................................................................... 272
12.12. Technical Assistance ............................................................................................................................. 274
13. THEORY OF OPERATION ............................................................................................ 275
13.1. Measurement Method .............................................................................................................................. 275
13.1.1. Calculating O
3
Concentration ........................................................................................................... 275
13.1.2. The Photometer UV Absorption Path ............................................................................................... 277
13.1.3. The Reference / Measurement Cycle............................................................................................... 278
06870C DCN6332