Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p48
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 48/108)
Character Range: 1019050–1022422

delay time (from the probe to the analyser inlet) shall be no more than 4 seconds.
              4.1.3.1.6. The HFID shall be used with a constant mass flow (heat exchanger) system to ensure a representative sample, unless compensation for varying CVS volume flow is made.
              4.1.4. Analysers
              4.1.4.1. General requirements for gas analysis
              4.1.4.1.1. The analysers shall have a measuring range compatible with the accuracy required to measure the concentrations of the exhaust gas sample compounds.
              4.1.4.1.2. If not defined otherwise, measurement errors shall not exceed ±2 per cent (intrinsic error of analyser) disregarding the reference value for the calibration gases.
              4.1.4.1.3. The ambient air sample shall be measured on the same analyser with the same range.
              4.1.4.1.4. No gas drying device shall be used before the analysers unless it is shown to have no effect on the content of the compound in the gas stream.
              4.1.4.2. Carbon monoxide (CO) and carbon dioxide (CO2) analysis
              The analysers shall be of the non-dispersive infrared (NDIR) absorption type.
              4.1.4.3. Hydrocarbons (HC) analysis for all fuels other than diesel fuel
              The analyser shall be of the flame ionization (FID) type calibrated with propane gas expressed in equivalent carbon atoms (C1).
              4.1.4.4. Hydrocarbons (HC) analysis for diesel fuel and optionally for other fuels
              The analyser shall be of the heated flame ionization type with detector, valves, pipework, etc., heated to 190 °C 10 °C. It shall be calibrated with propane gas expressed equivalent to carbon atoms (C1).
              4.1.4.5. Methane (CH4) analysis
              The analyser shall be either a gas chromatograph combined with a flame ionization detector (FID), or a flame ionization detector (FID) combined with a non-methane cutter (NMC-FID), calibrated with methane or propane gas expressed equivalent to carbon atoms (C1).
              4.1.4.6. Nitrogen oxides (NOx) analysis
              The analysers shall be of chemiluminescent (CLA) or non-dispersive ultra-violet resonance absorption (NDUV) types.
              4.1.4.7. (Reserved)

              4.1.4.8. (Reserved)

              4.1.4.9. (Reserved)

              4.1.4.10. (Reserved)

              4.1.4.11. Hydrogen (H2) analysis (if applicable)
              The analyser shall be of the sector field mass spectrometry type, calibrated with hydrogen.
              4.1.4.12. Water (H2O) analysis (if applicable)

              The analyser shall be of the non-dispersive infrared analyzer (NDIR) absorption type. The NDIR shall be calibrated either with water vapour or with propylene (C3H6). If the NDIR is calibrated with water vapour, it shall be ensured that no water condensation can occur in tubes and connections during the calibration process. If the NDIR is calibrated with propylene, the manufacturer of the analyzer shall provide the information for converting the concentration of propylene to its corresponding concentration of water vapour. The values for conversion shall be periodically checked by the manufacturer of the analyzer, and at least once per year.
              4.1.5. Recommended system descriptions
              4.1.5.1. Figure A5/9 is a schematic drawing of