Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:10:p3
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 10 (pt 3/32)
Character Range: 1276351–1279737

shall be corrected by the amount of the gaseous compound in the dilution air using the following equation:
              where:
                   is the concentration of gaseous compound i in the diluted exhaust gas corrected by the amount of gaseous compound i contained in the dilution air, ppm;
                   is the measured concentration of gaseous compound i in the diluted exhaust gas, ppm;
                   is the concentration of gaseous compound i in the dilution air, ppm;
                   is the dilution factor.
              3.2.1.1.1. The dilution factor  shall be calculated using the equation for the concerned fuel (as applicable):
                                                   for petrol (E10) and diesel (B0)
               for petrol (E0)
               for diesel (B7)
               for LPG
               for NG/biomethane
               for ethanol (E85)
               for hydrogen
              With respect to the equation for hydrogen:
                     CH2O is the concentration of H2O in the diluted exhaust gas contained in the sample bag, per cent volume;
                     CH2O-DA is the concentration of H2O in the dilution air, per cent volume;
                     CH2 is the concentration of H2 in the diluted exhaust gas contained in the sample bag, ppm.
              If a fuel type is not listed in this paragraph, the DF for that fuel shall be calculated using the equations in paragraph 3.2.1.1.2. of this annex.
              If the manufacturer uses a DF that covers several phases, it shall calculate a DF using the mean concentration of gaseous compounds for the phases concerned.
              The mean concentration of a gaseous compound shall be calculated using the following equation:
              where:
                is mean concentration of a gaseous compound;
                is the concentration of each phase;
               is the Vmix of the corresponding phase;
              n  is the number of phases.
              3.2.1.1.2. The general equation for calculating the dilution factor DF for each reference fuel with an arithmetic average composition of CxHyOz is as follows:
              where:
                   is the concentration of CO2 in the diluted exhaust gas contained in the sample bag, per cent volume;
                   is the concentration of HC in the diluted exhaust gas contained in the sample bag, ppm carbon equivalent;
                   is the concentration of CO in the diluted exhaust gas contained in the sample bag, ppm.
              3.2.1.1.3. Methane measurement
              3.2.1.1.3.1. For methane measurement using a GC-FID, NMHC shall be calculated using the following equation:
              where:
                      is the corrected concentration of NMHC in the diluted exhaust gas, ppm carbon equivalent;
                      is the concentration of THC in the diluted exhaust gas, ppm carbon equivalent and corrected by the amount of THC contained in the dilution air;
                      is the concentration of  in the diluted exhaust gas, ppm carbon equivalent and corrected by the amount of contained in the dilution air;
                      is the FID response factor to methane determined and specified in paragraph 5.4.3.2. of Annex B5.
              3.2.1.1.3.2. For methane measurement using an NMC-FID, the calculation of NMHC depends on the