Document ID: chunk:federal_register_of_legislation:F2012C00283:reg:20:p16
Version: federal_register_of_legislation:F2012C00283
Segment Type: reg
Provision Reference: reg 20 (pt 16/19)
Character Range: 237583–240665

test and corrected to standard conditions (273.2 K and 101.33 kPa),
 Qi      =  density of the pollutant i in grams per litre at normal temperature and pressure (273.2 K and 101.33 kPa),
 kh      =  humidity correction factor used for the calculation of the mass emissions of oxides of nitrogen. There is no humidity correction for HC and CO,
 Ci      =  concentration of the pollutant i in the diluted exhaust gas expressed in ppm and corrected by the amount of the pollutant i contained in the dilution air,
 d       =  distance corresponding to the operating cycle in kilometres.

              6.6.4. Correction for dilution air concentration
               The concentration of pollutant in the diluted exhaust gas shall be corrected by the amount of the pollutant in the dilution air as follows:
            (4)

 Where:
 Ci      =  concentration of the pollutant i in the diluted exhaust gas, expressed in ppm and corrected by the amount of i contained in the dilution air,
 Ce      =  measured concentration of pollutant i in the diluted exhaust gas, expressed in ppm,
 Cd      =  concentration of pollutant i in the air used for dilution, expressed in ppm,
 DF      =  dilution factor.

         The dilution factor is calculated as follows:
             for petrol (E5)  (5a)
             and diesel (B5) (5a)
             for LPG (5b)
             for NG/biomethane (5c)
             for Ethanol (E85) (5d)
  In these equations:
CCO2  =  concentration of CO2 in the diluted exhaust gas contained in the sampling bag, expressed in per cent volume,
CHC   =  concentration of HC in the diluted exhaust gas contained in the sampling bag, expressed in ppm carbon equivalent,
 CCO  =  concentration of CO in the diluted exhaust gas contained in the sampling bag, expressed in ppm.

               Non-methane hydrocarbon concentration is calculated as follows:
               CNMHC  = CTHC - (Rf CH4 • CCH4)

               where:
               CNMHC  = corrected concentration of NMHC in the diluted exhaust gas,   expressed in ppm carbon equivalent,

               CTHC  =  concentration of THC in the diluted exhaust gas, expressed in   ppm carbon equivalent and corrected by the amount of THC                             contained in the dilution air,

               CCH4  =  concentration of CH4 in the diluted exhaust gas, expressed in   ppm carbon equivalent and corrected by the amount of CH4                             contained in the dilution air,
               Rf CH4 = is the FID response factor to methane as defined in  paragraph 2.3.3. of Appendix 3 of Annex 4a.
              6.6.5. Calculation of the NO humidity correction factor
               In order to correct the influence of humidity on the results of oxides of nitrogen, the following calculations are applied:

           (6)

          in which:

 Where:
 H       =  absolute humidity expressed in grams of water per kilogram of dry air,
 Ra      =  relative humidity of the ambient air expressed as a percentage,
 Pd      =  saturation vapour pressure at ambient temperature expressed