{
  "url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-3/division-3.5/division-3.5.1",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-3/division-3.5/division-3.5.1.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/3/division/3.5/division/3.5.1",
  "kind": "division",
  "number": "3.5.1",
  "heading": "Mass of gaseous emissions",
  "text": "To calculate the total mass per test of gaseous emission m gas [g/test], its molar concentration shall be multiplied by its respective molar flow and by exhaust gas molar mass; then integration over test cycle shall be performed [equation (7-104)]:\nm gas = M gas × ∫ ṅ exh × x gas × d t\n(7-104)\nWhere:\nM gas molar mass of the generic gaseous emission [g/mol]\nṅ exh instantaneous exhaust gas molar flow rate on a wet basis [mol/s]\nx gas instantaneous generic gas molar concentration on a wet basis [mol/mol]\nt time [s]\nSince equation (7-104) has to be solved by numerical integration, it is transformed in equation (7-105):\nm gas = M gas × ∫ ṅ exh × x gas × d t ⇒ m gas = 1 ƒ × M gas × ∑ i = 1 N ṅ exh i × x gas i\n(7-105)\nWhere:\nM gas generic emission molar mass [g/mol]\nṅ exh i instantaneous exhaust gas molar flow rate on a wet basis [mol/s]\nx gas i instantaneous generic gas molar concentration on a wet basis [mol/mol]\nƒ data sampling rate [Hz]\nN number of measurements [-]\nGeneral equation may be modified according to which measurement system is used, batch or continuous sampling, and if a varying rather than a constant flow rate is sampled.\n(a) For continuous sampling, in the general case of varying flow rate, the mass of the gaseous emission m gas [g/test] shall be calculated by means of equation (7-106):\nm gas = 1 ƒ × M gas × ∑ i = 1 N ṅ exh i × x gas i\n(7-106)\nWhere:\nM gas generic emission molar mass [g/mol]\nṅ exh i instantaneous exhaust gas molar flow rate on a wet basis [mol/s]\nx gas i instantaneous gaseous emission molar fraction on a wet basis [mol/mol]\nƒ data sampling rate [Hz]\nN number of measurements [-]\n(b) Still for continuous sampling but in the particular case of constant flow rate the mass of the gaseous emission m gas [g/test] shall be calculated by means of equation (7-107):\nm gas = M gas × ṅ exh × x – gas × Δ t\n(7-107)\nWhere:\nM gas generic emission molar mass [g/mol]\nṅ exh exhaust gas molar flow rate on a wet basis [mol/s]\nx – gas mean gaseous emission molar fraction on a wet basis [mol/mol]\nΔt time duration of test interval\n(c) For the batch sampling, regardless the flow rate is varying or constant, equation (7-104) can be simplified by means of equation (7-108):\nm gas = 1 ƒ × M gas × x – gas × ∑ i = 1 N ṅ exh i\n(7-108)\nWhere:\nM gas generic emission molar mass [g/mol]\nṅ exh i instantaneous exhaust gas molar flow rate on a wet basis [mol/s]\nx – gas mean gaseous emission molar fraction on a wet basis [mol/mol]\nƒ data sampling rate [Hz]\nN number of measurements [-]",
  "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/3/division/3.5/division/3.5.1",
    "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."
}