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ATI Aerosol Photometer & Aerosol Generator Basics

ATI Aerosol Photometer & Aerosol Generator Basics. NAFA Meeting April 18, 2012 Scottsdale, AZ. ATI Aerosol Photometer Basics website: www.ATItest.com email: info@ATItest.com phone: 410-363-9696. Dave Crosby dcrosby@atitest.com Tony Hawkins ahawkins@atitest.com

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ATI Aerosol Photometer & Aerosol Generator Basics

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  1. ATI Aerosol Photometer & Aerosol Generator Basics NAFA Meeting April 18, 2012 Scottsdale, AZ

  2. ATI Aerosol Photometer Basicswebsite: www.ATItest.comemail: info@ATItest.comphone: 410-363-9696 Dave Crosbydcrosby@atitest.com Tony Hawkins ahawkins@atitest.com Don Largentdlargent@atitest.com

  3. Topics Basic HEPA Filtration System Aerosol Generator Basics Photometer Basics HEPA Filter Testing Summary Standards and help resources

  4. Objectives of Session Explain basic HEPA filtration components Describe “in-situ” test techniques Detail aerosol generator design and operation Describe components and functions of the photometer Differentiate between efficiency and leak testing of HEPA filters

  5. Basic HEPA Filtration System

  6. HEPA System Examples

  7. Aerosol Generators Types of Aerosols Aerosol Size Laskin Nozzle Type Thermal Inert Gas Type Generator Capacities & Concentration

  8. Two Types of Aerosol Monodisperse or Near- Monodisperse Polydisperse

  9. Near-Monodisperse Aerosol

  10. Polydisperse Aerosol

  11. Aerosol Size 0.3 Micrometer

  12. Monodisperse Aerosol Penetrometer (i.e. Filter Tester)

  13. Polydisperse Laskin Nozzle Aerosol Generators

  14. Polydisperse Laskin Nozzle

  15. DOP Output of Laskin Nozzle NRL Report 5929, Echols & Young, pg. 16, Appendix A, Model III-A (4 jets) 20 psig @ 75 lpm @ 5.1 mg/l 75 lpm X 5.1 mg/l = 382.5 mg/min DOP Output mixed with 135 cfm of air produces a concentration of 100ug/l

  16. Calculate Aerosol Challenge Concentration (µg/l) Laskin Nozzle Number Nozzles X 13,500 Total Flow (cfm)

  17. Polydisperse Thermal (vapor condensation) Aerosol Generator (inert gas)

  18. Thermal Generator Operation

  19. Generator Capacities

  20. Generator Applications Monodisperse Penetrometer -used at the factory and DOE Filter Test Facility (ATI Filter Test Laboratory):EFFICIENCY Testing Polydisperse Aerosol Generators and Photometers:In-Place Filter Leak Testing

  21. Photometers Forward Light Scattering Photometer Flow Diagram Photometer Components Digital Type Internal Reference (INT REF)

  22. Light Scattering

  23. Forward Light Scattering

  24. Forward Light Scattering Chamber

  25. Photometers View Particles En Masse

  26. Particle Counter Operation(One Particle at a time)

  27. Photometer Flow Diagram

  28. Analog Photometer

  29. TDA-2G Digital Photometer

  30. 2H Digital Photometer

  31. 2i Digital Photometer

  32. Digital Photometer Components Selector Valve % Penetration Display & Bar Graph Program/Control Key (ENTER) Scroll UP () & Scroll Down () keys Function keys (0) (100) (REF) (ALARM) Upstream & Downstream Connections Power switch (Ctrl-Alt-DEL) Fuses & various signal connectors

  33. 2i Digital Photometer Features Selector Valve – Electronically controlled Full digital display % Penetration & Flow Controlled via Probe and Base Easily navigable menu structure Power switch and button

  34. Digital Photometer Operation Use INT REF to establish 100 ug/l sensitivity level Measure & record upstream challenge concentration Set for 100% with upstream challenge concentration (100% baseline) Set for .000% (0% baseline) Test downstream for aerosol leakage

  35. Purpose of INT REF Feature To measure upstream challenge concentration levels directly in ug/l To set a photometer to the correct sensitivity level when an upstream aerosol challenge sample is unavailable and the concentration has to be calculated

  36. INT REF on Digital Photometer Using Calculated Concentration Simply scroll to the calculated concentration

  37. In-Situ Filter Leak Testing Performed with Polydisperse Aerosol Tests the entire filtration system for defects Checks the following system components Frames Gaskets Filters

  38. SUMMARY Efficiency testing done at factory with Monodisperse aerosol Efficiency testing measures penetration through HEPA filter only In-place testing done with Polydisperse aerosol In-place tests complete filtration system for defects (leaks)

  39. Standards IEST RP-001 Filters IEST RP-002 Laminar Flow Devices IEST RP-006 Cleanrooms IEST RP-034 Scanning HEPA Filters ISO 14644 ASME AG-1 Code ASME N-511 NSF 49

  40. Where to Get More Information Nuclear Air Cleaning Handbook NEBB Cleanroom Guide IEST Standards Various Manufacturers Literature and websites International Air Cleaning Conference Proceedings

  41. Thank You!

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