Document ID: chunk:federal_register_of_legislation:F2008C00323:reg:20:p22
Version: federal_register_of_legislation:F2008C00323
Segment Type: reg
Provision Reference: reg 20 (pt 22/23)
Character Range: 206218–209085

to the following steady speed.

           6.6.2.  Periods of constant speed shall be achieved by keeping the accelerator position fixed.

           7.  PROCEDURE FOR SAMPLING AND ANALYSIS

           7.1.  Sampling

           Sampling shall begin (BS) before or at the initiation of the engine start up procedure and end on conclusion of the final idling period in the extra-urban cycle (Part Two, end of sampling (ES)) or, in the case of test Type VI, on conclusion of the final idling period of the last elementary urban cycle (Part One).

           7.2.  Analysis

           7.2.1.  The exhaust gases contained in the bag shall be analysed as soon as possible and in any event not later than 20 minutes after the end of the test cycle. The spent particulate filters shall be taken to the chamber no later than one hour after conclusion of the test on the exhaust gases and shall there be conditioned for between 2 and 36 hours and then be weighed.

           7.2.2.  Prior to each sample analysis, the analyser range to be used for each pollutant shall be set to zero with the appropriate zero gas.

           7.2.3.  The analysers shall then be set to the calibration curves by means of span gases of nominal concentrations of 70 to 100 per cent of the range.

           7.2.4.  The analysers' zeros shall then be rechecked. If the reading differs by more than 2 per cent of the range from that set in paragraph 7.2.2. above, the procedure shall be repeated.

           7.2.5.  The samples shall then be analysed.

           7.2.6.  After the analysis, zero and span points shall be rechecked using the same gases. If these rechecks are within  2 per cent of those in paragraph 7.2.3. above, the analysis shall be considered acceptable.

           7.2.7.  At all points in this paragraph, the flow-rates and pressures of the various gases shall be the same as those used during calibration of the analysers.

           7.2.8. 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 Appendix 5 to this Annex.

            8. DETERMINATION OF THE QUANTITY OF GASEOUS
             AND PARTICULATE POLLUTANTS EMITTED

           8.1.  The volume considered

           The volume to be considered shall be corrected to conform to the conditions of 101.33 kPa and 273.2 K.

           8.2.  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