OIML R 85-1 & 2 Edition 2008 - fundmetrology.ru

1 Automatic level gauges for measuring the level of liquid in stationary storage tanksPart 1: Metrological and technical requirementsPart 2: Metrological control and testsJaugeurs automatiques pour le mesurage des niveaux de liquide dans les r servoirs de stockage fixesPartie 1: Exigences m trologiques et techniquesPartie 2: Contr les m trologiques et essaisOIML R 85-1 & 2 Edition 2008 (E) oiml R 85-1 & 2 Edition 2008 (E)ORGANISATIONINTERNATIONALEDEM TROLOGIEL GALEINTERNATIONALORGANIZATIONOFLEGALMETR OLOGYINTERNATIONALRECOMMENDATION oiml R 85-1 & 2:2008 (E) 3 Contents Foreword ..4 1 Introduction .. 5 2 Scope.

2 5 3 Terminology .. 6 4 Description of the category of instrument .. 11 5 Units of 11 6 Metrological requirements .. 12 Rated operating conditions .. 12 Maximum permissible 13 Presumption of compliance .. 13 7 Technical requirements .. 14 Indicating 14 Additional technical requirements for ALGs with movable sensor .. 15 Installation requirements .. 15 Ancillary devices .. 16 16 Verification marks .. 16 Sealing .. 16 Safeguarding the integrity of the measurement .. 17 8 Metrological controls.

3 21 Type evaluation .. 21 Initial verification .. 38 Annex A .. 40 oiml R 85-1 & 2:2008 (E) 4 Foreword The International Organization of Legal Metrology ( oiml ) is a worldwide, intergovernmental organization whose primary aim is to harmonize the regulations and metrological controls applied by the national metrological services, or related organizations, of its Member States. The main categories of oiml publications are: International Recommendations ( oiml R), which are model regulations that establish the metrological characteristics required of certain measuring instruments and which specify methods and equipment for checking their conformity.

4 oiml Member States shall implement these Recommendations to the greatest possible extent; International Documents ( oiml D), which are informative in nature and which are intended to harmonize and improve work in the field of legal metrology; International Guides ( oiml G), which are also informative in nature and which are intended to give guidelines for the application of certain requirements to legal metrology; and International Basic Publications ( oiml B), which define the operating rules of the various oiml structures and systems. oiml Draft Recommendations, Documents and Guides are developed by Technical Committees or Subcommittees which comprise representatives from the Member States.

5 Certain international and regional institutions also participate on a consultation basis. Cooperative agreements have been established between the oiml and certain institutions, such as ISO and the IEC, with the objective of avoiding contradictory requirements. Consequently, manufacturers and users of measuring instruments, test laboratories, etc. may simultaneously apply oiml publications and those of other institutions. International Recommendations, Documents, Guides and Basic Publications are published in English (E) and translated into French (F) and are subject to periodic revision.

6 Additionally, the oiml publishes or participates in the publication of Vocabularies ( oiml V) and periodically commissions legal metrology experts to write Expert Reports ( oiml E). Expert Reports are intended to provide information and advice, and are written solely from the viewpoint of their author, without the involvement of a Technical Committee or Subcommittee, nor that of the CIML. Thus, they do not necessarily represent the views of the oiml . This publication - reference oiml R 85-1 & 2, Edition 2008 (E) - was developed by the oiml Technical Subcommittee TC 8/SC 1 Static volume and mass measurement.

7 It was sanctioned for final publication by the International Conference of Legal Metrology in 2008. Together with oiml R 85-3, Edition 2008 (E), this Edition supersedes the previous Edition of oiml R 85 ( Edition 1998). oiml Publications may be downloaded from the oiml web site in the form of PDF files. Additional information on oiml Publications may be obtained from the Organization s headquarters: Bureau International de M trologie L gale 11, rue Turgot - 75009 Paris - France Telephone: 33 (0)1 48 78 12 82 Fax: 33 (0)1 42 82 17 27 E-mail: Internet: oiml R 85-1 & 2:2008 (E) 5 Automatic level gauges for measuring the level of liquid in stationary storage tanks Part 1: Metrological and technical requirements 1 Introduction The most important changes made in the present Edition of R 85 compared to the 1998 Edition are: R 85.

8 1998 also included requirements concerning the tank. Edition 2008 only deals with the level gauge itself; The format of Edition 2008 has been brought into line with oiml B 6-2: Directives for the technical work. Part 2: Guide to the drafting and presentation of oiml International Recommendations and Documents; The performance tests have been updated according to oiml D 11:2004 General requirements for electronic measuring instruments. The latest editions of the referred IEC standards have been applied; Edition 2008 has been split into Parts 1 Metrological and technical requirements and 2 Metrological control and tests, and Part 3 Test report format.

9 With respect to the application of R 85:2008 within the scope of the oiml Certificate System, the consequence is that Certificates of Conformity issued according to R 85:2008 will cover a more precisely defined measuring instrument, an electronic level gauge. In practice the automatic level gauge (ALG) will be installed on a tank according to oiml R 71. The differences between R 85:1998 and R 85:2008 are thus far-reaching, notably in that ALGs that comply with the 1998 Edition can not be presumed to comply with this new Edition , unless the compliance is confirmed by new tests.

10 2 Scope This Recommendation specifies the metrological and technical requirements and test procedures for automatic level gauges for storage tanks. Storage tanks include all the shapes referenced in oiml R 71 [5] vertical and cylindrical storage tanks, and pressurized storage tanks (spheres, spheroid, bullets). The storage tanks may be refrigerated or heated. The metrological purpose of tank level measurements is the application in conjunction with tank calibration tables for the determination of liquid volume received from, delivered to, or contained in stationary storage tanks.