Document ID: chunk:federal_register_of_legislation:F2012C00283:reg:20:p14
Version: federal_register_of_legislation:F2012C00283
Segment Type: reg
Provision Reference: reg 20 (pt 14/19)
Character Range: 231958–234918

keeping the accelerator position fixed.
              6.4.6. 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).
              6.4.7. During the test the speed is recorded against time or collected by the data-acquisition system so that the correctness of the cycles performed can be assessed.
              6.4.8. Particles shall be measured continuously in the particle sampling system. The average concentrations shall be determined by integrating the analyser signals over the test cycle.
              6.5. Post-test procedures
              6.5.1. Gas analyser check
               Zero and span gas reading of the analysers used for continuous 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 span gas value.
              6.5.2. Particulate filter weighing
               Reference filters shall be weighed within 8 hours of the test filter weighing. The contaminated particulate test filter shall be taken to the weighing chamber within one hour following the analyses of the exhaust gases. The test filter shall be conditioned for at least 2 hours and not more than 80 hours and then weighed.
              6.5.3. Bag analysis
              6.5.3.1. 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.
              6.5.3.2. Prior to each sample analysis, the analyser range to be used for each pollutant shall be set to zero with the appropriate zero gas.
              6.5.3.3. 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.
              6.5.3.4. The analysers' zero settings shall then be rechecked: if any reading differs by more than 2 per cent of the range from that set in paragraph 6.5.3.2. above, the procedure shall be repeated for that analyser.
              6.5.3.5. The samples shall then be analysed.
              6.5.3.6. 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 6.5.3.3. above, the analysis shall be considered acceptable.
              6.5.3.7. 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.
              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