{
  "url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-2/division-2.2/division-2.2.1",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-2/division-2.2/division-2.2.1.json",
  "legislation": "eur/2017/654",
  "legislation_title": "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",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2017-654",
  "path": "annex/VII/division/2/division/2.2/division/2.2.1",
  "kind": "division",
  "number": "2.2.1",
  "heading": "Mass of the gaseous emissions",
  "text": "The exhaust gas mass flow rate shall be measured with a constant volume sampling (CVS) system, which may use a positive displacement pump (PDP), a critical flow venturi (CFV) or a subsonic venturi (SSV).\nFor systems with constant mass flow (i.e. with heat exchanger), the mass of the pollutants m gas [g/test] shall be determined by means of equation (7-23):\nm gas = k h · k · u gas · c gas · m ed\n(7-23)\nwhere:\nu gas is the ratio between density of exhaust gas component and density of air, as given in Table 7.2 or calculated by means of equation (7-34) [-]\nc gas = mean background corrected concentration of the component on a wet basis [ppm] or [% vol] respectively\nk h = NOx correction factor [-], only to be applied for the NOx emission calculation\nk = 1 for c gasr,w, i in [ppm], k = 10 000 for c gasr,w, i in [% vol]\nm ed = total diluted exhaust gas mass over the cycle [kg/test]\nFor systems with flow compensation (without heat exchanger), the mass of the pollutants m gas [g/test] shall be determined by calculation of the instantaneous mass emissions, by integration and by background correction by means of equation (7-24):\nm gas = k h × k × ∑ i = 1 N m ed, i × c e × u gas − m ed × c d × 1 − 1 D × u gas\n(7-24)\nWhere:\nc e emission concentration in the diluted exhaust gas, on a wet basis [ppm] or [% vol]\nc d emission concentration in the dilution air, on a wet basis [ppm] or [% vol]\nm ed, i mass of the diluted exhaust gas during time interval i [kg]\nm ed total mass of diluted exhaust gas over the cycle [kg]\nu gas tabulated value from Table 7.2 [-]\nD dilution factor [see equation (7-28) of point 2.2.2.2] [-]\nk h NOx correction factor [-], only to be applied for the NOx emission calculation\nk 1 for c in [ppm], k = 10 000 for c in [% vol]\nThe concentrations c gas, c e and c d can be either values measured in a batch sample (bag, but not allowed for NOx and HC) or be averaged by integration from continuous measurements. Also m ed, i has to be averaged by integration over the test cycle.\nThe following equations show how the needed quantities (c e, u gas and m ed) shall be calculated.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/2/division/2.2/division/2.2.1",
    "retrieved_at": "2026-11-01T14:45:01.864924+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}