Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:1800:p3
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 1800 (pt 3/12)
Character Range: 511707–514310

(a) Maintain a wall temperature of 328 K to 473 K (55 °C to 200 °C), up to the converter for dry measurement, and up to the analyzer for wet measurement;
                  (b) Be made of stainless steel or PTFE.
 HP Heated sampling pump
 The pump shall be heated to the temperature of HSL.
 SL Sampling line for CO and CO2
 The line shall be made of PTFE or stainless steel. It may be heated or unheated.
 HC  HFID analyzer
 Heated flame ionization detector (HFID) or flame ionization detector (FID) for the determination of the hydrocarbons. The temperature of the HFID shall be kept at 453 K to 473 K (180 °C to 200 °C).
 CO, CO2 NDIR analyzer
 NDIR analyzers for the determination of carbon monoxide and carbon dioxide (optional for the determination of the dilution ratio for PT measurement).
 NOx  CLD analyzer or NDUV analyzer
 CLD, HCLD or NDUV analyzer for the determination of the oxides of nitrogen. If a HCLD is used it shall be kept at a temperature of 328 K to 473 K (55 °C to 200 °C).
 B  Sample dryer (optional for NO measurement)
 To cool and condense water from the exhaust sample. It is optional if the analyzer is free from water vapour interference as determined in paragraph 9.3.9.2.2. of this annex. If water is removed by condensation, the sample gas temperature or dew point shall be monitored either within the water trap or downstream. The sample gas temperature or dew point shall not exceed 280 K (7 °C). Chemical dryers are not allowed for removing water from the sample.
 BK Background bag (optional; Figure 10 only)
 For the measurement of the background concentrations.
 BG Sample bag (optional; Figure 10 only)
 For the measurement of the sample concentrations.
A.2.1.4. Non-methane cutter method (NMC)
 The cutter oxidizes all hydrocarbons except CH4 to CO2 and H2O, so that by passing the sample through the NMC only CH4 is detected by the HFID. In addition to the usual HC sampling train (see Figures 9 and 10), a second HC sampling train shall be installed equipped with a cutter as laid out in Figure 11. This allows simultaneous measurement of total HC, CH4 and NMHC.
 The cutter shall be characterized at or above 600 K (327 °C) prior to test work with respect to its catalytic effect on CH4 and C2H6 at H2O values representative of exhaust stream conditions. The dew point and O2 level of the sampled exhaust stream shall be known. The relative response of the FID to CH4 and C2H6 shall be determined in accordance with paragraph 9.3.8. of this annex.
           Figure 11
           Schematic flow diagram of methane analysis with the NMC
A.2.1.5. Components of