stack_testing_according_to_us_epa_methods
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GasmetTM FTIR application note Stack testing according to US EPA methods KEY WORDS • Emissions monitoring • Fourier Transform Infrared (FTIR) • EPA test methods 320, 321 • Hydrogen Chloride (HCl) PRODUCTS • DX4000 Portable FTIR Gas Analyzer • PSS Portable Sampling System OVERVIEW US EPA has two stack testing methods for FTIR. Method 320 is a FTIR method for measuring wide range of organic and inorganic pollutants from stack. Method 321 is a specific version for measuring HCl at Portland cement plants. These methods define a QA/QC process to verify the accuracy of the results. The requirements for analytical equipment and software are defined on 40 CFR Part 60 Appendix B Performance Specification 15. GASMETTM analysers and CALCMETTM software are designed taking the requirements of performance specification into account. Short term measurements can be carried out with the portable analyzer and sampling system (above). Test gases can be injected to the probe upstream of particle filter or to the sampling system, downstream of all sample treatment stages. All parts in contact with the sample are heated to 180 °C. Hot particle filters are available in sintered steel (0.1 µm), sintered PTFE (2 µm) and microfiber (0.1 µm) Copyright Gasmet Technol

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Typical analytical procedure to complete method 320 / 321 test From a paper by Maxwell Lee and John B. Koogler: Gas Emissions Testing By EPA Methods 320: Procedures and Results, Florida Section of the Air and Waste Management Association on Sept. 7-9, 2003 PRE-TEST 1)Background spectrum −Evaluate diagnostics of the instrumentation 2)Baseline (cylinder UHP-N2) (i.e. zero check) −Determine the level of background noise −Observe spectrum for baseline tilt, i.e., indicates vibrations/perturbations affecting instrument 3)Calibration Transfer Standard (cylinder 100-ppm ethylene, i.e. span check)...

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