http://www.legislation.gov.uk/eur/2017/655/annex/appendix/1Commission Delegated Regulation (EU) 2017/655 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to monitoring of gaseous pollutant emissions from in-service internal combustion engines installed in non-road mobile machinery (Text with EEA relevance)Commission Delegated Regulation (EU) 2017/655Commission Delegated Regulation (EU) 2017/655 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to monitoring of gaseous pollutant emissions from in-service internal combustion engines installed in non-road mobile machinery (Text with EEA relevance)2020-12-09King's Printer of Acts of Parliamenthttps://webarchive.nationalarchives.gov.uk/eu-exit/https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:02017R0655-20180807texttext/xmlen2018-08-07 ANNEX Appendix 1 <Strong>Portable Emissions Measurement System</Strong> 1.

The PEMS shall include the following measurement instruments:

gas analysers to measure the concentrations of the gaseous pollutant emissions set out in the first paragraph of point 1 of Appendix 2; an Exhaust Flow Meter (EFM) based on the averaging Pitot or equivalent principle; sensors to measure the ambient temperature and pressure; other measurement instruments required for the in-service monitoring test;

PEMS shall also include:

a transfer line to transport the extracted samples from the sampling probe to the gas analysers, including a sampling probe; a data logger to store the data collected from the ECU; PEMS may include a Global Positioning System (GPS).

2. Measurement instruments requirements 2.1.

Measurement Instruments shall meet the requirements on calibration and performance checks set out in Section 8.1 of Annex VI to Delegated Regulation (EU) 2017/654. Special attention shall be given to perform the following actions:

the vacuum-side leak verification of the PEMS as set out in Section 8.1.8.7 of Annex VI to Delegated Regulation (EU) 2017/654; the response and updating-recording verification of the gas analyser as set out in Section 8.1.6 of Annex VI to Delegated Regulation (EU) 2017/654.

2.1.2.

Measurement instruments shall meet the specifications set out in Section 9.4 of Annex VI to Delegated Regulation (EU) 2017/654.

2.1.3.

The analytical gases used for calibrating the measurement instruments shall meet the requirements set out in Section 9.5.1 of Annex VI to Delegated Regulation (EU) 2017/654.

2.2. Transfer line and sampling probe requirements 2.2.1.

The transfer line shall meet the requirements set out in point 9.3.1.2 of Annex VI to Delegated Regulation (EU) 2017/654.

2.2.2.

The sampling probe shall meet the requirements set out in point 9.3.1.1 of Annex VI to Delegated Regulation (EU) 2017/654.