ATI Aerosol Photometer & Aerosol Generator Basics
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ATI Aerosol Photometer Basics
website: website: www.ATItest.comwww.ATItest.comemail: email: info@ATItest.cominfo@ATItest.com
phone: 410-363-9696phone: 410-363-9696
Dave Crosby dcrosby@atitest.comTony Hawkins ahawkins@atitest.comDon Largent dlargent@atitest.com
Topics
• Basic HEPA Filtration System• Aerosol Generator Basics• Photometer Basics• HEPA Filter Testing • Summary• Standards and help resources
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
Aerosol Generators
• Types of Aerosols• Aerosol Size• Laskin Nozzle Type• Thermal Inert Gas Type• Generator Capacities & Concentration
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
Calculate Aerosol Challenge Concentration (µg/l)
Laskin Nozzle
Number Nozzles X 13,500Total Flow (cfm)
Generator CapacitiesDescription TDA-4Blite TDA-4B 6D 5C
Aerosol Output Range 50-4,050 cfm 50-8,100 cfm 50-2,000 cfm 1,500-65,000 cfm
Aerosol Concentration 100µg/l @ 405 cfm* 810 cfm* 200 cfm* 6,500 cfm
Aerosol Concentration 10µg/l @ 4,050 cfm* 8,100 cfm* 2,000 cfm* 65,000 cfm
Generator Type 1 to 3 Laskin Nozzles
1 to 6 Laskin Nozzles
2 or 6 Laskin Nozzle Jets
Thermal (Vapor Condensation)
Compressed Gas 3 to 9 cfm @ 20 psi
3 to 18 cfm @ 20 psi
(Not Required) Inert Gas
Aerosol Type Polydispersed (cold)
Polydispersed (cold)
Polydispersed (cold)
Polydispersed (hot)
Size L x H x W L x H x W L x H x W L x H x W
Inches (in) 10in x 8in x 9in 11in x 10in x 11in 14.5in x 9in x 10in 14in x 10in x 10in
Weight-Pounds (lbs) 12 lbs 16 lbs 34 lbs 23 lbs
Electrical (Not Required) (Not Required) 110 or 220VAC 110 or 220VAC
*When operated at 20 psi
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
Photometers• Forward Light Scattering • Photometer Flow Diagram• Photometer Components Digital Type• Internal Reference (INT REF)
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
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
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
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
INT REF on Digital Photometer Using Calculated Concentration
• Simply scroll to the calculated concentration
In-Situ Filter Leak Testing
• Performed with Polydisperse Aerosol• Tests the entire filtration system for
defects
• Checks the following system componentsFramesGasketsFilters
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)
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
Where to Get More Information
• Nuclear Air Cleaning Handbook• NEBB Cleanroom Guide• IEST Standards• Various Manufacturers Literature and
websites• International Air Cleaning Conference
Proceedings
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