Division 3.6.2: Dry-to wet concentration conversion - 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

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} = \frac{x_{H2Odil}}{1 - x_{H2Odil}}

[(see equation (7-96)]

Where:

x _H2Odil

water molar fraction in the dilution air flow [mol/mol]

Division 3.6.2 Dry-to wet concentration conversion