# 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 7.3.1.4: Preparation of measurement equipment for sampling

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

The following steps shall be taken before emission sampling begins:
(a) Leak checks shall be performed within 8 hours prior to emission sampling in accordance with point 8.1.8.7;
(b) For batch sampling, clean storage media shall be connected, such as evacuated bags or tare-weighed filters;
(c) All measurement instruments shall be started in accordance with the instrument manufacturer's instructions and good engineering judgment;
(d) Dilution systems, sample pumps, cooling fans, and the data-collection system shall be started;
(e) The sample flow rates shall be adjusted to desired levels, using bypass flow, if desired;
(f) Heat exchangers in the sampling system shall be pre-heated or pre-cooled to within their operating temperature ranges for a test;
(g) Heated or cooled components such as sample lines, filters, chillers, and pumps shall be allowed to stabilize at their operating temperatures;
(h) Exhaust gas dilution system flow shall be switched on at least 10 minutes before a test sequence;
(i) Calibration of gas analyzers and zeroing of continuous analyzers shall be carried out in accordance with the procedure of point 7.3.1.5;
(j) Any electronic integrating devices shall be zeroed or re-zeroed, before the start of any test interval.

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VI/division/7/division/7.3/division/7.3.1/division/7.3.1.4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VI/division-7/division-7.3/division-7.3.1/division-7.3.1.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.