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Legal Metrology - Type Approval


Measuring instruments for mass-, volume-, length- and the area must be type-approved before they may be used legally for trade purposes.

  • ​Instruments are examined and tested to ensure that they meet the legal, technical, and accuracy requirements in terms of ​the relevant specifications/regulations.
  • On the successful completion of the evaluation a national Type Approval Certificate is issued, which means the instrument may be used for trade purposes.
  • In addition, a Pattern Description document for every approved instrument is issued and is available to users and the public. It covers
  • A description of the instrument and technical requirements;
  • Restrictions on use.
  • An index of approved instruments is also available on a database.
  • OIML R documents are sourced to give guidance on international requirements.

      1. An application form must be submitted for each instrument.
      2. Functional description – A comprehensive functional description of the instrument must be submitted. In the case of a modification include a list detailing all differences between original approval and modified instrument.
    1. 3. Supporting documentation:

      • Service manual.
      • Operational manual
      • Calibration manual.
      • Components list
      • Component layout.
      • Circuit diagrams.
      • Mechanical drawings.
      • Drawings and description of method of securing the instrument.
    2. 4. Software - shall be assigned with a fixed version number. This version number shall be adapted in the case of every software change that may affect the functions and accuracy of the instrument.

    3. 5. Embedded software - the manufacturer/agent shall describe or declare that the software of the instrument or module is embedded, i.e., it is used in a fixed hardware and software environment and cannot be modified or uploaded via any interface or by other means after securing and/or verification. In addition to the documentation required in 3 the manufacturer/agent shall submit the following documentation: 

      • Description of the metrologically relevant functions
      • Software identification (fixed version number).
      • Securing measures foreseen to provide for evidence of an intervention
      • Sample of instruments for laboratory evaluation - An operational instrument shall be provided for the laboratory evaluation.
      • Sample of the instrument for field tests - The installation of the instrument on-site and the provision of test equipment are​ the responsibility of the submitter.
    4. 6. OIML Certificate of Conformity (CoC) - The following documentation (in English) is required when an OIML CoC accompanies the application for type approval:

      • Copy of the OIML Certificate of Conformity.
      • Copy of the associated OIML Test Report.
      • Declaration of the authenticity of the OIML Certificate of Conformity and Test Report