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Appendix A                                                                                  Gas RATA Observation Sheet

5.  Reference Method Calculations

For sampling run durations of less than 1 hour, measurements at 1-minute intervals or a minimum of 30 measurements, whichever is less restrictive, shall be used.

a.  Percent by volume

Use equation 6C-1 from Method 6C to calculate the run percent by volume (ppm or %)

Cgas = Effluent gas concentration, dry basis, ppm.

Cavg =Average gas concentration indicated by gas analyzer, dry basis, ppm or %.

Co =Average of initial and final system calibration bias check responses for the zero gas, ppm, or %

Cm =Average of initial and final system calibration bias check responses for the upscale calibration gas, ppm or %.

Cma =Actual concentration of the upscale calibration gas, ppm or %.

b.  Percent by volume (O2 with low-level calibration gas)

For O2 analyzers that use a low-level calibration gas in place of a zero gas, calculate the effluent gas concentration using Equation 3A-1.

                                   Cma - Coa

               Cgas =  CCCCCCCCC  ( - Cm) + Cma                                                                     Eq. 3A-1

                                     Cm - Co

Cma = Actual concentration of the upscale calibration gas, percent

Coa = Actual concentration of the low-level calibration gas, percent.

Cm = Average of initial and final system calibration bias check responses for the upscale calibration gas, percent.

Co = Average of initial and final system calibration bias check responses for the low level gas, percent.

= Average gas concentration indicated by the gas analyzer, dry basis, percent.

Part 75 Field Audit Manual - July 16, 2003                                                                                                       Page A-18

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