Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p23
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 23/150)
Character Range: 778514–781494

The oxides of nitrogen analyser may also be of the Non-Dispersive Ultra Violet (NDUV) type.
A.2.2.3. Sampling of gaseous emissions
The sampling probes shall meet the requirements defined in paragraphs A.2.1.2. and A.2.1.3. of Appendix 2 to Annex 4 to this Regulation. The sampling line shall be heated to 190 °C (+/-10 °C).
              A.2.2.4. Other instruments
              The measuring instruments shall satisfy the requirements given in Table 7 in Annex 4 and paragraph 9.3.1. to Annex 4.
              A.2.2.5. PM number analysers

              A.2.2.5.1. General

              A.2.2.5.1.1. The PM number analyser shall consist of a pre-conditioning unit and a particle detector (see Figure 1). The particle detector may also pre-condition the aerosol. The analyser's sensitivity to shocks, vibrations, aging, variations in temperature and air pressure, electromagnetic interferences and other things that could affect the operation of the vehicle or the analyser shall be kept to a minimum as far as possible and shall be clearly stated in the supporting documentation produced by the instrument manufacturer. The PM number analyser shall fulfil the requirements of this Regulation and the specifications of the instrument manufacturer.

       Figure 1
       Example of a PM number analyser setup

       Notes: dotted lines depict optional parts; EFM means Exhaust mass Flow Meter; d means inner diameter ; PND means PM Number Diluter

              A.2.2.5.1.2. The PM number analyser shall be connected to the sampling point via a sampling probe which extracts a sample from the centreline of the tailpipe tube. If particles are not diluted at the tailpipe, the sampling line shall be heated to a minimum temperature of 373 K (100 °C) until the point of first dilution of the PM number analyser or the particle detector of the analyser. The residence time of the sample in the particle sampling line shall be less than 3 seconds to the point of first dilution or to the particle detector.

              A.2.2.5.1.3. All parts in contact with the sampled exhaust gas shall be always kept at a temperature that avoids condensation of any compound in the device. That may be achieved e.g. by heating to a higher temperature and diluting the sample or oxidising the (semi)volatile species.

              A.2.2.5.1.4. The PM number analyser shall include a heated section at wall temperature ≥ 573K (300 °C). The pre-conditioning unit shall control the heated stages to constant nominal operating temperatures, within a tolerance of ± 10 K and provide an indication of whether or not heated parts are at their correct operating temperatures. Lower temperatures are acceptable as long as the volatile particle removal efficiency meets the specifications set out in paragraph A.2.2.5.4.

              A.2.2.5.1.5. Pressure, temperature and other sensors shall monitor the operation of the instrument during its operation and shall trigger a warning or message in case