Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p54
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 54/56)
Character Range: 441741–445130

cycle and the exhaust gas mass flow rate according to the procedure in paragraph 8.4.2.2. The transformation time of the particle number sampling and measurement system shall be determined according to paragraph A.8.1.3.7. of Appendix 8 to this annex.
              10.4.2.  Determination of particle numbers with a partial flow dilution system

              Where particle numbers are sampled using a partial flow dilution system according to the procedures set out in paragraph 8.4., the number of particles
              emitted over the test cycle shall be calculated by means of the following
              equation:

                (95)

            Where:

                      N = number of particles emitted over the test cycle,

                      medf = mass of equivalent diluted exhaust gas over the cycle, determined according to paragraph 8.4.3.2.1. or 8.4.3.2.2., kg/test,

                      k = calibration factor to correct the particle number counter measurements to the level of the reference instrument where this is not applied internally within the particle number counter. Where the calibration factor is applied internally within the particle number counter, a value of 1 shall be used for k in the above equation,

                       = average concentration of particles from the diluted exhaust gas corrected to standard conditions (273.2 K and 101.33 kPa), particles per cubic centimetre,

                       = mean particle concentration reduction factor of the volatile particle remover specific to the dilution settings used for the test.

                        shall be calculated from the following equation:

                            (96)

                  Where:

                             cs,i = a discrete measurement of particle concentration in the diluted gas exhaust from the particle counter, corrected for coincidence and to standard conditions (273.2 K and 101.33 kPa), particles per cubic centimetre,

                             n = number of particle concentration measurements taken over the duration of the test.
              10.4.3. Determination of particle numbers with a full flow dilution system
               Where particle numbers are sampled using a full flow dilution system according to the procedures set out in paragraph 8.5., the number of particles emitted over the test cycle shall be calculated by means of the following equation:

                     (97)
               Where:
                      N  = number of particles emitted over the test cycle,
                      med = total diluted exhaust gas flow over the cycle calculated according to any one of the methods described in paragraphs 8.5.1.2. to 8.5.1.4., kg/test,
                      k = calibration factor to correct the particle number counter measurements to the level of the reference instrument where this is not applied internally within the particle number counter. Where the calibration factor is applied internally within the particle number counter, a value of 1 shall be used for k in the above equation,
                       = average corrected concentration of particles from the diluted exhaust gas corrected to standard conditions (273.2 K and 101.33 kPa), particles per cubic centimetre,
                       = mean particle concentration reduction factor of the volatile particle remover specific to the