Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:9:p2
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 9 (pt 2/71)
Character Range: 211991–215085

check within the control area shall be performed immediately upon completion of mode 13.

              The engine shall be conditioned at mode 13 for a period of three minutes before the start of the measurements. Three measurements shall be made at different locations within the control area, selected by the Technical Service. The time for each measurement shall be 2 minutes.

              The measurement procedure is identical to the NOx measurement on the 13-mode cycle, and shall be carried out in accordance with Sections 2.7.3, 2.7.5, and 4.1 of this Appendix, and Annex III, Appendix 4, Section 3.

              The calculation shall be carried out in accordance with Section 4.

2.7.7.                        Rechecking the analysers

              After the emission test a zero gas and the same span gas shall be used for rechecking. The test will be considered acceptable if the difference between the  pre-test and post-test results  is less than 2 % of  the  span gas value.

3.                                 ELR TEST RUN

3.1.                            Installation of the measuring equipment

              The opacimeter and sample probes, if applicable, shall be installed after the exhaust silencer or any aftertreatment device, if fitted, according to the general installation procedures specified by the instrument manufacturer. Additionally, the requirements of Section 10 of ISO IDS 11614 shall be observed, where appropriate.

              Prior to any zero and full scale checks, the opacimeter shall be warmed up and stabilised according to the instrument manufacturer's recommendations. If the opacimeter is equipped with a purge air system to prevent sooting of the meter optics, this system shall also be activated and adjusted according to the manufacturer's recommendations.

3.2.                            Checking of the opacimeter

              The zero and full scale checks shall be made in the opacity readout mode, since the opacity scale offers two truly definable calibration points, namely 0 % opacity and 100 % opacity. The light absorption coefficient is then correctly calculated based upon the measured opacity and the LA, as submitted by the opacimeter manufacturer, when the instrument is returned to the k readout mode for testing.

              With no blockage of the opacimeter light beam, the readout shall be adjusted to 0,0 % ± 1,0 % opacity. With the light being prevented from reaching the receiver, the readout shall be adjusted to 100,0 %
              ± 1,0 % opacity.

3.3.                            Test cycle

3.3.1.                        Conditioning of the engine

              Warming up of the engine and the system shall be at maximum power in order to stabilise the engine parameters according to the recommendation of the manufacturer. The preconditioning phase should also protect the actual measurement against the influence of deposits in the exhaust system from a former test.

              When the engine is stabilised, the cycle shall be started within 20 ± 2 s after the preconditioning phase. At