OIML R 137-1&2: 2012 (E) Gas meters. Part 1: Metrological and technical requirements. Part 2: Metrological controls and performance tests

Издательство: Bureau International de Métrologie Légale.
Количество страниц: 70.Foreword
This publication - reference OIML R 137-1 & -2, Edition 2012 - was developed by Technical Subcommittee TC 8/SC 7 Gas meters. It was approved online for final publication by the International Committee of Legal Metrology in 2012 and will be submitted to the International Conference of Legal Metrology in 2012 for formal sanction. It supersedes OIML R 137-1 (2006).After OIML R 137-1 Gas meters was published, the responsibility for this Recommendation was transferred to OIML TC 8/SC 7 and the secretariat began drafting Part 2 Metrological controls and performance tests. It was identified that this would require some changes to the contents of Part 1.
The separation of R 137 into Parts 1 and 2 was introduced to comply with the draft general format for OIML Recommendations, and ultimately has resulted in the drafting of the present publication which comprises both parts. The major changes since the 2006 edition of R 137 are:
the scope of the Recommendation has been amended to also include residential meters with internal temperature compensation;
the Terminology section has been amended to comply with OIML V 2-200:2012 International Vocabulary of Metrology – Basic and General Concepts and Associated Terms;
software requirements and evaluation methods from OIML D 31 General requirements for software controlled measuring instruments have been implemented;
several influence quantity tests extracted from OIML D 11 General requirements for electronic measuring instruments have been updated;
the test methods regarding the influences of flow disturbances have been amended.