# Commission Regulation (EC) No 692/2008 of 18 July 2008 implementing and amending Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information (Text with EEA relevance), Division 3.3

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

The exhaust gases mentioned in paragraph 4.3.1.1 shall be understood as including methane, water and hydrogen:
‘ … (HFID). It shall be calibrated with propane gas expressed as equivalent to carbon atoms (C 1 ).
Methane (CH 4 ) analysis:
The analyser shall be either a gas chromatograph combined with a flame ionisation (FID) type or a flame ionisation (FID) with a non-methane cutter type, calibrated with methane gas expressed as equivalent to carbon atoms (C 1 ).
Water (H 2 O) analysis:
The analyser shall be of the non-dispersive infrared analyzer (NDIR) absorption type. The NDIR shall be calibrated either with water vapour or with propylene (C 3 H 6 ). If the NDIR is calibrated with water vapour, it shall be ensured that no water condensation can occur in tubes and connections during the calibration process. If the NDIR is calibrated with propylene, the manufacturer of the analyzer shall provide the information for converting the concentration of propylene to its corresponding concentration of water vapour. The values for conversion shall be periodically checked by the manufacturer of the analyzer, and at least once per year.
Hydrogen (H 2 ) analysis:
The analyser shall be of the sector field mass spectrometry type, calibrated with hydrogen.
Nitrogen oxide (NO x ) … ’ .

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Source: https://www.legislation.gov.uk/eur/2008/692/annex/III/division/3/division/3.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2008-692/annex-III/division-3/division-3.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.