Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:1800:p2
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 1800 (pt 2/12)
Character Range: 509242–511922

shall:
                  (a) Be defined as the first 254 mm to 762 mm of the heated sampling line HSL1;
                  (b) Have a 5 mm minimum inside diameter;
                  (c) Be installed in the dilution tunnel DT (Figure 15) at a point where the diluent and exhaust gas are well mixed (i.e. approximately 10 tunnel diameters downstream of the point where the exhaust enters the dilution tunnel);
                  (d) Be sufficiently distant (radially) from other probes and the tunnel wall so as to be free from the influence of any wakes or eddies;
                  (e) Be heated so as to increase the gas stream temperature to 463 K  10 K (190 °C  10 °C) at the exit of the probe, or
                  to 385 K  10 K (112 °C  10 °C) for positive ignition engines;
                  (f) Non-heated in case of FID measurement (cold).
 SP3 Dilute exhaust gas CO, CO2, NOx sampling probe (Figure 10 only)
 The probe shall:
                  (a) Be in the same plane as SP2;
                  (b) Be sufficiently distant (radially) from other probes and the tunnel wall so as to be free from the influence of any wakes or eddies;
                  (c) Be heated and insulated over its entire length to a minimum temperature of 328 K (55 °C) to prevent water condensation.
 HF1 Heated pre-filter (optional)
 The temperature shall be the same as HSL1.
 HF2 Heated filter
 The filter shall extract any solid particles from the gas sample prior to the analyzer. The temperature shall be the same as HSL1. The filter shall be changed as needed.
 HSL1 Heated sampling line
 The sampling line provides a gas sample from a single probe to the split point(s) and the HC analyzer.
 The sampling line shall:
                  (a) Have a 4 mm minimum and a 13.5 mm maximum inside diameter;
                  (b) Be made of stainless steel or PTFE;
                  (c) Maintain a wall temperature of 463 K ± 10 K (190 °C ± 10 °C) as measured at every separately controlled heated section, if the temperature of the exhaust gas at the sampling probe is equal to or below 463 K (190 °C);
                  (d) Maintain a wall temperature greater than 453 K (180 °C), if the temperature of the exhaust gas at the sampling probe is above 463 K (190 °C);
                  (e) Maintain a gas temperature of 463 K ± 10 K (190 °C ± 10 °C) immediately before the heated filter HF2 and the HFID.
 HSL2 Heated NOx sampling line
 The sampling line shall:
                  (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