Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:1800:p1
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 1800 (pt 1/12)
Character Range: 506675–509494

1800  0.0          0.0

  m = motoring

Annex 4 ‑ Appendix 2 Measurement equipment
A.2.1. This appendix contains the basic requirements and the general descriptions of the sampling and analyzing systems for gaseous and particulate emissions measurement. Since various configurations can produce equivalent results, exact conformance with the figures of this appendix is not required. Components such as instruments, valves, solenoids, pumps, flow devices and switches may be used to provide additional information and coordinate the functions of the component systems. Other components which are not needed to maintain the accuracy on some systems may be excluded if their exclusion is based upon good engineering judgement.

A.2.1.1. Analytical system
A.2.1.2. Description of the analytical system
 Analytical system for the determination of the gaseous emissions in the raw exhaust gas (Figure 9) or in the diluted exhaust gas (Figure 10) are described based on the use of:
(a) HFID or FID analyzer for the measurement of hydrocarbons;

(b) NDIR analyzers for the measurement of carbon monoxide and carbon dioxide;

(c) HCLD or CLD analyzer for the measurement of the oxides of nitrogen.

 The sample for all components should be taken with one sampling probe and internally split to the different analyzers. Optionally, two sampling probes located in close proximity may be used. Care shall be taken that no unintended condensation of exhaust components (including water and sulphuric acid) occurs at any point of the analytical system.

       Figure 9
       Schematic flow diagram of raw exhaust gas analysis system for CO, CO2, NOx, HC
         a = vent b = zero, span gas c = exhaust pipe d = optional

       Figure 10
       Schematic flow diagram of diluted exhaust gas analysis system for CO, CO2, NOx, HC
    a = vent  b = zero, span gas c = dilution tunnel d = optional

A.2.1.3. Components of Figures 9 and 10
               EP Exhaust pipe

               SP1 Raw exhaust gas sampling probe (Figure 9 only)

 A stainless steel straight closed end multi-hole probe is recommended. The inside diameter shall not be greater than the inside diameter of the sampling line. The wall thickness of the probe shall not be greater than 1 mm. There shall be a minimum of three holes in three different radial planes sized to sample approximately the same flow. The probe shall extend across at least 80 per cent of the diameter of the exhaust pipe. One or two sampling probes may be used.
 SP2 Dilute exhaust gas HC sampling probe (Figure 10 only)
 The probe 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