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What is the PM2.5 FEM configuration?• The transport assembly was redesigned for filter tapepositioning accuracy of about 1/1000 of an inch.• The beta source gap geometry was reduced 25%, resulting inhigher signal-to-noise levels and reduced air density effects.• The beta count time was increased from 4 to 8 minutes,improving the statistical noise stability by about 40%. Knownas the “2X” effect.• The firmware was extensively revised to provide flowstatistics, new settings, and improved field calibrations.• The field zero background test was implemented to fine-tunethe slope offset characteristics in the field.• The BX-596 Temp/Baro combination sensor was designed.6/9/2009 6
What is the PM2.5 FEM configuration?• The combined effect of these improvements resulted in thetypical detection limit (2σ) of the unit improving from about6ug to about 3ug for hourly measurements, and below 1ug for24 hour averages.• <strong>Met</strong> <strong>One</strong> began PM2.5 FEM testing immediately upon releaseof the final U.S. EPA specifications for candidate monitors.• The units had to meet stringent requirements for both FRMcorrelation and inter-unit comparison during both winter andsummer seasons at multiple sites around the country.6/9/2009 7
Page 1 and 2: BAM-1020Beta Attenuation Mass Monit
Page 3 and 4: Overview - Topics of Discussion•
Page 5: What is the PM2.5 FEM Configuration
Page 9 and 10: Data Example 1 - PM10 and PM2.5 Lev
Page 11 and 12: Data Example 3 - PM2.5 Slope / Offs
Page 13 and 14: Typical older unimproved unit compa
Page 15 and 16: What is the PM2.5 FEM configuration
Page 17 and 18: Theory of Operation• At the begin
Page 19 and 20: Mass Calculation• DEFINITIONS:- I
Page 21 and 22: Beta Gauge Safety• The BAM-1020 c
Page 23 and 24: BAM-1020 Tape Transport6/9/2009 23
Page 25 and 26: Simplicity - Measurement System•
Page 27 and 28: Critical Checks• Leak Check, Flow
Page 29 and 30: BAM-1020 Span Check• The BAM-1020
Page 31 and 32: Measurement Challenges• Enclosure
Page 33 and 34: Electromagnetic Interference• Sou
Page 35 and 36: Supplemental Materials• BAM-1020

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