Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p1
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 1/27)
Character Range: 550666–554188

13      Lubricating oil pump                                                         Yes

Annex 4 ‑ Appendix 7 Procedure for the measurement of ammonia
              A.7.1. This appendix describes the procedure for measurement of ammonia (NH3). For non-linear analysers, the use of linearising circuits shall be permitted.
              A.7.2.              Two measurement principles are specified for NH3 measurement and either principle may be used provided it meets the criteria specified in paragraph A.7.2.1. or A.7.2.2., respectively. Gas dryers shall not be permitted for NH3 measurement.
              A.7.2.1. Laser Diode Spectrometer (LDS)
              A.7.2.1.1.              Measurement principle
              The LDS employs the single line spectroscopy principle. The NH3 absorption line is chosen in the near infrared spectral range and scanned by a single-mode diode laser.
              A.7.2.1.2.              Installation
              The analyser shall be installed either directly in the exhaust pipe (in-situ) or within an analyser cabinet using extractive sampling in accordance with the instrument manufacturers instructions. If installed in an analyser cabinet, the sample path (sampling line, pre-filter(s) and valves) shall be made of stainless steel or PTFE and shall be heated to 463 ± 10 K (190 ± 10 °C) in order to minimize NH3 losses and sampling artefacts. In addition, the sampling line shall be as short as practically possible.
              Influence from exhaust temperature and pressure, installation environment and vibrations on the measurement shall be minimized, or compensation techniques be used.
              If applicable, sheath air used in conjunction with in-situ measurement for protection of the instrument, shall not affect the concentration of any exhaust component measured downstream of the device, or sampling of other exhaust components shall be made upstream of the device.
              A.7.2.1.3.              Cross interference
              The spectral resolution of the laser shall be within 0.5 cm-1 in order to minimize cross interference from other gases present in the exhaust gas.
              A.7.2.2.              Fourier Transform Infrared (hereinafter FTIR) analyser
              A.7.2.2.1.              Measurement principle
              The FTIR employs the broad waveband infrared spectroscopy principle. It allows simultaneous measurement of exhaust components whose standardized spectra are available in the instrument. The absorption spectrum (intensity/wavelength) is calculated from the measured interferogram (intensity/time) by means of the Fourier transform method.

              A.7.2.2.2.              Installation and sampling
              The FTIR shall be installed in accordance with the instrument manufacturer's instructions. The NH3 wavelength shall be selected for evaluation. The sample path (sampling line, pre-filter(s) and valves) shall be made of stainless steel or PTFE and shall be heated to 463 ± 10 K (190 ± 10 °C) in order to minimize NH3 losses and sampling artefacts. In addition, the sampling line shall be as short as practically possible.
              A.7.2.2.3.              Cross interference
              The spectral resolution of the NH3 wavelength shall be within 0.5 cm-1 in order to minimize cross interference from other gases present in the exhaust gas.
              A.7.3.              Emissions test procedure and evaluation
              A.7.3.1.              Checking the analysers