Placing on the market and entry into service

Before a liquid fuel measuring system enters into service, it must have either

  • valid national type approval and verification or
  • declaration of conformity in accordance with MID


National type approval and verification

National type approval was given to the measuring instrument before 30 October 2006. The symbol of the national type approval for flow meters designed for liquids other than water is VJ.A.XX.YY and for flow measurement equipment VJ.D.XX.YY, where XX is a consecutive number and YY stands for the last two digits of the approval year. National type approval is valid for 10 years from the day of granting but for no longer than until 30 October 2016.


A measuring instrument which has a valid verification can be recognised from the mark in image 1. Image 2 has a Finnish seal mark.




Image 1. Mark indicating valid verification. In this example the verification was carried out  in January 2012.

Image 2. Finnish seal mark.



Declaration of conformity in accordance with MID

The Measuring Instrument Directive sets essential demands for the whole liquid fuel measuring system, including all parts of the equipment relevant for measuring. When assessing conformity, one of the procedures described in the directive must be used by the manufacturer. The Declaration of Conformity granted by the manufacturer covers the whole system. In addition to the Declaration of Conformity, the manufacturer affixes a mark (image 3) to the measuring system. Information about notified bodies is available on the Nando system maintained by the European Commission.




Image 3. Example of a CE mark in accordance with MID. The letter M and the year indicate the manufacturing date of the instrument. The four digit number on the right is identification of the notified body that took part in the assessment.



Normal liquid fuel distribution equipment often has many meters. Manufacturers can decide whether their distribution equipment is equipped with one MID symbol which covers all meters or whether each distribution meter should have its own marking.  More detailed information about marking types and information provided with the system can be found on WELMEC Guide 10.5 "Guide for Common Application of Marking of Fuel Dispensers".


By attaching a CE mark on a product, the manufacturer guarantees that it is in accordance with all relevant directives that require a CE mark. The manufacturer must be familiar with all requirements concerning the equipment. The Declaration of Conformity must carefully describe the directives and standards the equipment complies with.


Measuring liquid fuels and OIML R117-1

Manufacturers can use integrated (harmonised) standards or OIML normative documents to attest to the conformity of their equipment to essential MID requirements. The normative document concerning liquid fuel measurement systems is OIML recommendation R 117-1 (2007). WELMEC (European cooperation in legal metrology) has published a correlation table in the guide WELMEC Guide 8.15 "Measuring systems for the continuous and dynamic measurement of quantities of liquids other than water Cross Reference Table 2004/22/EC vs. OIML R 117-1 - 2007" which includes MID’s essential requirements and the corresponding points of OIML recommendation.


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