Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p88
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 88/108)
Character Range: 1137036–1140176

of the cycle.
              2.12.5. Sample switching
              2.12.5.1. Gaseous emissions
              Sampling from the diluted exhaust and dilution air shall be switched from one pair of sample bags to subsequent bag pairs, if necessary, at the end of each phase of the applicable WLTC to be driven.
              2.12.5.2. Particulate
              The requirements of paragraph 2.10.1.1. of this annex shall apply.
              2.12.6. Dynamometer distance shall be recorded for each phase.
              2.13. Ending the test
              2.13.1. The engine shall be turned off immediately after the end of the last part of the test.
              2.13.2. The constant volume sampler, CVS, or other suction device shall be turned off, or the exhaust tube from the tailpipe or tailpipes of the vehicle shall be disconnected.
              2.13.3. The vehicle may be removed from the dynamometer.
              2.14. Post-test procedures
              2.14.1. Gas analyser check
              Zero and calibration gas reading of the analysers used for continuous diluted measurement shall be checked. The test shall be considered acceptable if the difference between the pre-test and post-test results is less than 2 per cent of the calibration gas value.
              2.14.2. Bag analysis
              2.14.2.1. Exhaust gases and dilution air contained in the bags shall be analysed as soon as possible. Exhaust gases shall, in any event, be analysed not later than 30 minutes after the end of the cycle phase.
              The gas reactivity time for compounds in the bag shall be taken into consideration.
              2.14.2.2. As soon as practical prior to analysis, the analyser range to be used for each compound shall be set to zero with the appropriate zero gas.
              2.14.2.3. The calibration curves of the analysers shall be set by means of calibration gases of nominal concentrations of 70 to 100 per cent of the range.
              2.14.2.4. The zero settings of the analysers shall be subsequently rechecked: if any reading differs by more than 2 per cent of the range from that set in paragraph 2.14.2.2. of this annex, the procedure shall be repeated for that analyser.
              2.14.2.5. The samples shall be subsequently analysed.
              2.14.2.6. After the analysis, zero and calibration points shall be rechecked using the same gases. The test shall be considered acceptable if the difference is less than 2 per cent of the calibration gas value.
              2.14.2.7.  The flow rates and pressures of the various gases through analysers shall be the same as those used during calibration of the analysers.
              2.14.2.8. The content of each of the compounds measured shall be recorded after stabilization of the measuring device.
              2.14.2.9. The mass and number of all emissions, where applicable, shall be calculated according to Annex B7.
              2.14.2.10. Calibrations and checks shall be performed either:
                  (a)  Before and after each bag pair analysis; or
                  (b)  Before and after the complete test.
              In