Appendix 2 MEASUREMENT OF SMOKE OPACITY
United Kingdom
1.
INTRODUCTION
1.1.
This Appendix describes the requirements for measuring the opacity of exhaust emissions.
2.
SYMBOL OF THE CORRECTED ABSORPTION COEFFICIENT
2.1.
A symbol of the corrected absorption coefficient shall be affixed to every vehicle conforming to a vehicle type to which this test applies. The symbol shall be a rectangle surrounding a figure expressing in m–1 the corrected absorption coefficient obtained, at the time of approval, from the test under free acceleration. The test method is described in section 4.
2.2.
The symbol shall be clearly legible and indelible. It shall be fixed in a conspicuous and readily accessible place, the location of which shall be specified in the Addendum to the type-approval certificate shown in Appendix 4 to Annex I.
2.3.
Figure IV.2.1 gives an example of the symbol.
Figure IV.2.1
The above symbol shows that the corrected absorption coefficient is 1,30 m–1.
3.
SPECIFICATIONS AND TESTS
3.1.
The specifications and tests shall be those set out in Part III, section 24, of UN/ECE Regulation No 24, with the exception to these procedures set out in section 3.2.
3.2.
The reference to Annex 2 in paragraph 24.1 of UN/ECE Regulation No 24 shall be understood as a reference to Appendix 2 to Annex X to this Regulation.
4.
TECHNICAL REQUIREMENTS
4.1.
The technical requirements shall be those set out in Annexes 4, 5, 7, 8, 9 and 10 to UN/ECE Regulation No 24, with the exceptions set out in sections 4.2., 4.3 and 4.4.
4.2.
Test at steady speeds over the full load curve
4.2.1.
The references to Annex 1 in paragraph 3.1. of Annex 4 of UN/ECE Regulation No 24 shall be understood as references to Appendix 3 to Annex I to this Regulation.
4.2.2.
The reference fuel specified in paragraph 3.2 of Annex 4 of UN/ECE Regulation No 24 shall be understood as reference to the reference fuel in Annex IX to this Regulation appropriate to the emission limits against which the vehicle is being type approved.
4.3.
Test under free acceleration
4.3.1.
The references to Table 2, Annex 2 in paragraph 2.2 of Annex 5 to UN/ECE Regulation No 24 shall be understood as references to the table under point 2.4.2.1 of Appendix 4 to Annex I to this Regulation.
4.3.2.
The references to paragraph 7.3 of Annex 1 in paragraph 2.3 of Annex 5 to UN/ECE Regulation No 24 shall be understood as references to Appendix 3 to Annex I to this Regulation.
4.4.
‘ECE’ method of measuring the net power of C.I. engines
4.4.1.
The references in paragraph 7 of Annex 10 to UN/ECE Regulation No 24 to the ‘Appendix to this Annex’ and in paragraphs 7 and 8 of Annex 10 to UN/ECE Regulation No 24 to ‘Annex 1’ shall be understood as references to Appendix 3 to Annex I to this Regulation.