MID : a CE directive for regulated measuring toolsce

The directive 2004/22/CE for measuring tools (MID) has been passed by the Parliament and the European Council on 03/31/04 and has to be applied since the 30rd of October 2006

The directive stands in for nationwide regulations of each european countries and applies to 10 families of instruments. It is aimed for the standardization of the new regulations for those new instruments (in the market or in operation) in Europe by eliminating trade barriers that are involved in the current national distortions.

This directive called “new approach” enables the manufacturer to choose between several evaluation systems of the measuring instruments conformity and also to renew the terms and conditions. Technically, it reinforces the importance of European norms and OILM recommendations and introduces the notion of presumption of conformity to essential requirements of the directive.

The market opening involved by the impact of such certificates in Europe will help the commercialization of these regulated measuring tools.


The tools targeted by the directive
  • Exhaust gaz analysers
  • Water meters
  • Active electrical energy meters
  • Heat meters
  • Gas meters and volume conversion devices
  • Dimensional measuring instruments
  • Automatic weighing instruments
  • Material measures
  • Continuous and dynamic measuring devices of liquid quantities other than water
  • Taximeters
 Conditions related to the MID application

In France, the use of an electricity meter with a MID certification on a private electrical system is mandatory as part of the active energy billing and based on consumption statements by index difference.

It concerns specific areas as campings, holiday rentals, student accommodations, offices, shopping centres, marina, exhibition halls, load system for electric cars.

The MID directive, for all members state of the EU implies the certification of meters by a notified body which exempt controls from a national organization of legal metrology. It enables an Acean energy meter with a MID certification to be used as  an active energy meter for rebilling in every country of the EU.
However, the MID decrees the certification of a product in accordance to the EN50470-1/-3 norm as well as the certification of the conception (B Module) and the manufacturing process (D Module) by an accredited organization in order to guarantee the product traceability and its metrological value. In that way, steps are taken towards consumer protection.

Accuracy classes and energy meters identification

The EN50470-1/-3 norm defines three specific accuracy classes A, B and C. It’s possible to put them together by analogy with IEC62053-21/-22 norms of active energy metering. For example, the A class is tantamount to a 2% precision, the B class to 1% and the C class to 0.5%.

Also, a regulatory mark has to be append for the traceability including the name of the manufacturer and the reference number just as :

  • a reference to the D module certification
  • the year of production and the number of the accredited organization (e.g M11-1259)
  • a reference delivered by the  accredited organization, demonstrating the  compliance review of the B module manufacturing process
  • the serial number of the meter
  • a compliance declaration sent with each product sold.
Acean products concerned

Active energy meters which the reference number ends with the letter “M” as DVH5141-M and  MDVH5291-M are in accordance with the MID certification.

It does not affect the current transformers and the additional features (other than active energy metering) of more evolved meters.

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