The Measuring Instruments Directive (2004/22/EC) is a directive by the European Union, which intends to create a common market for measuring instruments across the 27 countries of the EU. Its most prominent tenet is that all kinds of meters which receive a MID approval may be used in all countries across the EU.
The MID covers these measuring instruments:
- Water meters
- Gas meters and volume conversion devices
- Active electrical energy meters
- Heat meters
- Measuring systems for the continuous and dynamic measurement of quantities of liquids other than water
- Automatic weighing instruments
- Taximeters
- Material measures
- Dimensioning systems
- Exhaust gas analysers
Measuring instruments that comply with the MID bear:
- the CE mark
- a capital letter ‘M’ and the last two digits of the year of its affixing, surrounded by a rectangle
- the identification number of the notified body involved in conformity assessment
The Measuring Instruments Directive has been published on 30 April 2004 in the Official Journal of the EU, but not applied until after 30 October 2006 and there will be a 10 year long transition period. National implementations of the new legislation are currently in the works.
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