# 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 3.2: Symbols for chemical balance

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

x dil/exh Amount of dilution gas or excess air per mole of exhaust gas
x H2Oexh Amount of water in exhaust per mole of exhaust gas
x Ccombdry Amount of carbon from fuel in the exhaust per mole of dry exhaust gas
x H2Oexhdry Amount of water in exhaust per dry mole of dry exhaust gas
x prod/intdry Amount of dry stoichiometric products per dry mole of intake air
x dil/exhdry Amount of dilution gas and/or excess air per mole of dry exhaust gas
x int/exhdry Amount of intake air required to produce actual combustion products per mole of dry (raw or diluted) exhaust gas
x raw/exhdry Amount of undiluted exhaust gas, without excess air, per mole of dry (raw or diluted) exhaust gas
x O2intdry Amount of intake air O2 per mole of dry intake air
x CO2intdry Amount of intake air CO2 per mole of dry intake air
x H2Ointdry Amount of intake air H2O per mole of dry intake air
x CO2int Amount of intake air CO2 per mole of intake air
x CO2dil Amount of dilution gas CO2 per mole of dilution gas
x CO2dildry Amount of dilution gas CO2 per mole of dry dilution gas
x H2Odildry Amount of dilution gas H2O per mole of dry dilution gas
x H2Odil Amount of dilution gas H2O per mole of dilution gas
x [emission]meas Amount of measured emission in the sample at the respective gas analyzer
x [emission]dry Amount of emission per dry mole of dry sample
x H2O[emission]meas Amount of water in sample at emission-detection location
x H2Oint Amount of water in the intake air, based on a humidity measurement of intake air

---
Source: https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/3/division/3.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-3/division-3.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.