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Legal Metrology - Type Approval


Type Approval Of Measuring Instruments Requirements For 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.
Type Approval Of Measuring Instruments Requirements For Type Approval Submission

  1. An application form must be submitted for each instrument.
  1. 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. 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.
  1. 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.
  1. 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.
  1. 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