# 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 3.6.2: Dry-to wet concentration conversion

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

The same relations for raw gases (point 3.5.2) shall be used for dry-to-wet conversion on diluted samples. For dilution air a humidity measurement shall be performed with the aim to calculate its water vapour fraction x H2Odildry [mol/mol] by means of equation (7-96):
x H2Odildry = x H2Odil 1 − x H2Odil
[(see equation (7-96)]
Where:
x H2Odil water molar fraction in the dilution air flow [mol/mol]

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/3/division/3.6/division/3.6.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-3/division-3.6/division-3.6.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.