Document ID: chunk:federal_register_of_legislation:F2012C00283:reg:20:p15
Version: federal_register_of_legislation:F2012C00283
Segment Type: reg
Provision Reference: reg 20 (pt 15/19)
Character Range: 234638–237821

those used during calibration of the analysers.
              6.5.3.8. The figure adopted for the content of the gases in each of the pollutants measured shall be that read off after stabilisation of the measuring device. Hydrocarbon mass emissions of compression-ignition engines shall be calculated from the integrated HFID reading, corrected for varying flow if necessary, as shown in paragraph 6.6.6. below.
              6.6. Calculation of emissions
              6.6.1. Determination of volume
              6.6.1.1. Calculation of the volume when a variable dilution device with constant flow control by orifice or venturi is used.
               Record continuously the parameters showing the volumetric flow, and calculate the total volume for the duration of the test.
              6.6.1.2. Calculation of volume when a positive displacement pump is used
               The volume of diluted exhaust gas measured in systems comprising a positive displacement pump is calculated with the following formula:
                V = Vo · N
 Where:
 V       =  volume of the diluted gas expressed in litres per test (prior to correction),
 Vo      =  volume of gas delivered by the positive displacement pump in testing conditions in litres per revolution,
 N       =  number of revolutions per test.

              6.6.1.3. Correction of Volume to Standard Conditions
               The diluted exhaust-gas volume is corrected by means of the following formula:
                 (1)

           Where:

  (2)

                PB = barometric pressure in the test room in kPa,
                 P1 = vacuum at the inlet to the positive displacement pump in kPa relative   to the ambient barometric pressure,
                 Tp = average temperature of the diluted exhaust gas entering the positive  displacement  pump during the test (K).

              6.6.2. Total mass of gaseous and particulate pollutants emitted
               The mass M of each pollutant emitted by the vehicle during the test shall be determined by obtaining the product of the volumetric concentration and the volume of the gas in question, with due regard for the following densities under above-mentioned reference conditions:
               In the case of carbon monoxide (CO): d = 1.25 g/l
               In the case of hydrocarbons:
                For petrol (E5) (C1H1.89O0.016)  d = 0.631 g/1
                For diesel (B5) (C1Hl.86O0.005)  d = 0.622 g/1
                For LPG (CH2.525)    d = 0.649 g/l
                For NG/biomethane (C1H4)   d = 0.714 g/l
                For ethanol (E85) (C1H2,74O0.385) d = 0.932 g/l
               In the case of nitrogen oxides (NOx): d = 2.05 g/1
              6.6.3. Mass emissions of gaseous pollutants shall be calculated by means of the following formula:

 Where:
 Mi      =  mass emission of the pollutant i in grams per kilometre,
 Vmix    =  volume of the diluted exhaust gas expressed in litres per 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