of Method 3 should be followed to

validate the O₂ and CO2 measurement results. 8.2 If only O2 is measured using Method 3A. measurements of the sample stream CO2 concentration should be obtained at the sample by-pass vent discharge using an Orsat requirements for measuring and controlling the analyzer flow rate are not applicable if data are presented that demonstrate the analyzer is insensitive to flow variations over the range encountered during the test. [Method 3A added by 51 FR 21165, June 11, 1986] [Appendix A, Method 3A] 121:1576.4 or Fyrite analyzer. or equivalent. Duplicate samples should be obtained concurrent with at least one run. Average the duplicate Orsat or Fyrite analysis results for each run. Use the average CO2 values for comparison with the O₂ measurements in accordance with the procedures described in Section 4.4 of Method 3. 8.3 If only CO2 is measured using Method 3A. concurrent measurements of the sample stream CO2 concentration should be obtained using an Orsat or Fyrite analyzer as described in Section 8.2. For each run. differences greater than 0.5 percent between the Method 3A results and the average of the duplicate Fyrite analysis should be investigated. 9. Emission Calculation. For all CO2 enalyzers, and for O₂ analyzers that can be calibrated with zero gas, follow