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Instrumental Methods Update

Instrumental Methods Update. Methods 3A, 6C, 7E, 10, & 20. Purpose. Harmonize - Same Performance Tests - Same Calibration Gases Update - Address Outdated Equipment & Procedures Simplify - Plain English Format -Adding Flexibility.

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Instrumental Methods Update

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  1. Instrumental Methods Update Methods 3A, 6C, 7E, 10, & 20

  2. Purpose Harmonize -SamePerformance Tests - Same Calibration Gases Update -Address Outdated Equipment & Procedures Simplify - Plain English Format -Adding Flexibility

  3. Instrumental Methods Update • Method 3A: O2/CO2 • Method 6C SO2 • Method 7E NOx • Method 10 CO • Method 20 NOx/SO2/Diluent

  4. Performance RequirementsExisting

  5. Current Cal Gas Requirements

  6. Instrumental Methods Update • Additional Revisions • Cal Error/Bias Calculation - % of Std • Dropping Drift Check Between Runs • Bias Test Definition, Correction, Reporting • M7E Converter Efficiency Test • Alternative Interference Test for M6C • Frequency of Interference Test • Alternative Dynamic Spiking Test • M20 Only a Placeholder

  7. Bias Test Revisions • Definition Current: Difference between post-run bias test and calibration error test Proposing: Difference between post-run bias test and cal gas tag value • Dropping Bias Correction • Report Bias as Uncertainty

  8. Interference CheckInterference Gas Challenge to InstrumentAcceptance: Sum < 2.5% of High Cal Value

  9. Frequency of Interference Test Currently: Once for each source category Proposing: Once a year for each tested source category Initial test may be manufacturer certification

  10. Alternative Dynamic Spiking Test • Conducted During Test • Min. 5 1-min. Samples • Recoveries Must Be 100 ± 5% • Can Be Used in Place of Interference & Bias Tests

  11. Low Concentrations Provisions<10 ppm • Bias check ± 0.5 ppm instead of 5% of Emission Std • Initial Manufacturer type certification

  12. SchedulePublication in Federal Register Proposal December ’02 Promulgation December ‘03

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