Division 4.2.1.2 General requirements

Figure A5/12

Particulate sampling system

Figure A5/13

Double dilution particulate sampling system

1. 4.2.1.2.1Division 4.2.1.2.1
2. 4.2.1.2.2Division 4.2.1.2.2
3. 4.2.1.2.3The sampled dilute exhaust gas shall be maintained at a temperature above 20 °C and below 52 °C within 20 cm upstream or downstream of the particulate sampling filter face. Heating or insulation of components of the particulate sampling system to achieve this is permitted.
4. 4.2.1.2.4Division 4.2.1.2.4
5. 4.2.1.2.5Division 4.2.1.2.5
6. 4.2.1.2.6Division 4.2.1.2.6
7. 4.2.1.2.7Division 4.2.1.2.7
8. 4.2.1.2.8The sample flow from the dilution tunnel shall be measured with an accuracy of ± 2.5 per cent of reading or ± 1.5 per cent full scale, whichever is the least.
9. 4.2.1.2.9All data channels required for the measurement of PM shall be logged at a frequency of 1 Hz or faster. Typically these would include:
10. 4.2.1.2.10For double dilution systems, the accuracy of the diluted exhaust transferred from the dilution tunnel Vep defined in paragraph 3.3.2. of Sub-Annex 7 in the equation is not measured directly but determined by differential flow measurement.
11. 4.2.1.2.11Division 4.2.1.2.11