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The MID (Measuring Instruments Directive - 2004/22/CE) is a 2004 European Directive applicable to measuring devices and systems in the context of commercial transactions. The aim of the directive is improve protection of consumers and safeguard their interests.
These measuring instruments may be active electrical energy meters (Appendix MI003 of the Directive), water meters, gas meters, thermal energy meters, weighing instruments, etc.
The EN50470-1/-3 standard defines three specific accuracy classes: A, B and C. These are comparable to the IEC62053-21/-22 active energy metering standard: Class A is equivalent to 2% accuracy, Class B to 1 % and Class C to 0.5 %.
For total compatibility with the Directive, there must be regulatory marking for meter traceability. In addition to the manufacturer’s name and the product reference, this regulatory marking comprises: