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Division 3.9

United Kingdom

Original text. Later amendments are not shown.

An addition to the requirements of Paragraph 1.3. of Appendix 8 to Annex 4, the following requirements shall apply:

Non-methane hydrocarbon concentration is calculated as follows:

CNMHC = CTHC — (Rf CH4 × CCH4)

where:

CNMHC

  • corrected concentration of NMHC in the diluted exhaust gas, expressed in ppm carbon equivalent,

    • CTHC

  • concentration of THC in the diluted exhaust gas, expressed in ppm carbon equivalent and corrected by the amount of THC contained in the dilution air,

    • CCH4

  • concentration of CH4 in the diluted exhaust gas, expressed in ppm carbon equivalent and corrected by the amount of CH4 contained in the dilution air,

    • Rf CH4

  • is the FID response factor to methane as defined in paragraph 2.3 of Annex 4-Appendix 6.