# Commission Delegated Regulation (EU) 2017/654 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery, Division 3.3.4: Total HC (THC) concentration initial contamination correction

Extent: E+W+S+N.I.

For HC measurement, x THC[THC-FID] shall be calculated by using the initial THC contamination concentration x THC[THC-FID]init from point 7.3.1.3 of Annex VI by means of equation (7-83):
x THC THC-FID cor = x THC THC-FID uncorr − x THC THC-FID init
(7-83)
Where:
x THC[THC-FID]cor THC concentration corrected for contamination [mol/mol]
x THC[THC-FID]uncorr THC uncorrected concentration [mol/mol]
x THC[THC-FID]init initial THC contamination concentration [mol/mol]

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/3/division/3.3/division/3.3.4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-3/division-3.3/division-3.3.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.