3.9.An addition to the requirements of Paragraph 1.3. of Appendix 8 to Annex 4, the following requirements shall apply:U.K.
Non-methane hydrocarbon concentration is calculated as follows:
CNMHC = CTHC — (Rf CH4 × CCH4)
where:
=
corrected concentration of NMHC in the diluted exhaust gas, expressed in ppm carbon equivalent,
=
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,
=
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,
=
is the FID response factor to methane as defined in paragraph 2.3 of Annex 4-Appendix 6.