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TELEDYNE INSTRUMENTS
Table of Contents 460L Instruction Manual
iv 05228 Rev B
PRINTED DOCUMENTS ARE UNCONTROLLED DCN 5164
9.1.1. Filter Replacement Procedure............................................................................................45
9.1.2. Mounting the Particulate Filter Externally............................................................................46
9.2. Maintaining the Optional H
2
O Coalescing Filter...........................................................................47
9.2.1. Draining the Optional Coalescing Filter ...............................................................................47
9.2.2. Replacing the Coalescing Membrane ..................................................................................48
9.3. UV Lamp Replacement ...........................................................................................................49
9.4. Cleaning Exterior Surfaces of the 460L .....................................................................................50
9.5. Degree of Protection ..............................................................................................................50
10. THEORY OF OPERATION............................................................................................................51
10.1. Basic O
3
Measurement Principle .............................................................................................51
10.1.1. (Beer’s Law).................................................................................................................51
10.1.2. The Absorption Path ......................................................................................................52
10.1.3. The Reference / Measurement Cycle ................................................................................53
10.1.4. Digital Noise Filter .........................................................................................................54
10.2. Pneumatic Theory of Operation..............................................................................................55
10.2.1. Basic Pneumatic Flow And Flow Control ............................................................................55
10.2.2. Internal Pump and Flow Control.......................................................................................55
10.2.3. Optional Sample Conditioning .........................................................................................56
10.2.3.1. H
2
O Coalescing Filter...............................................................................................56
10.2.3.2. H
2
O Vapor Dryer.....................................................................................................56
10.2.3.3. Ozone Destruct Scrubber .........................................................................................57
10.3. Electronic Theory of Operation...............................................................................................58
10.3.1. Main Board...................................................................................................................58
10.3.2. O
3
Sensor Module..........................................................................................................59
10.3.2.1. O
3
Sensor Components............................................................................................59
10.3.2.2. Sensor Module PCA .................................................................................................60
10.3.3. CPU Board....................................................................................................................61
10.3.3.1. I/O Functions .........................................................................................................61
10.3.3.2. Status and Alarm Functions......................................................................................61
10.3.4. Display Driver and Keyboard Assembly.............................................................................62
10.3.4.1. Keyboard...............................................................................................................62
10.3.4.2. Display..................................................................................................................62
10.3.4.3. Display Driver ........................................................................................................62
10.3.5. Power Distribution.........................................................................................................63
11. TROUBLESHOOTING..................................................................................................................65
11.1. Status Output Summary .......................................................................................................65
11.2. Troubleshooting Using Status Outputs ....................................................................................65
11.2.1. Sensor OK....................................................................................................................65
11.2.2. Invalid Reading.............................................................................................................66
11.2.3. Lamp Low ....................................................................................................................66
11.2.4. Status LED / Status Output Troubleshooting Summary .......................................................66
11.3. Concentration Alarm Outputs.................................................................................................67
11.4. Technical Assistance ............................................................................................................68
12. A PRIMER ON ELECTRO-STATIC DISCHARGE.............................................................................69
12.1. How Static Charges are Created.............................................................................................69
12.2. How Electro-Static Charges Cause Damage .............................................................................70
12.3. Common Myths About ESD Damage .......................................................................................71
12.4. Basic Principles of Static Control ............................................................................................72
12.4.1. General Rules ...............................................................................................................72
12.4.2. Basic anti-ESD Procedures for Analyzer Repair and Maintenance ..........................................73
12.4.2.1. Working at the Instrument Rack................................................................................73
12.4.2.2. Working at an Anti-ESD Work Bench..........................................................................73
12.4.2.3. Transferring Components from Rack to Bench and Back................................................74
12.4.2.4. Opening Shipments from Teledyne Instruments’ Customer Service.................................75
12.4.2.5. Packing Components for Return to Teledyne Instruments Customer Service ...................76