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Utility meters and ancillary devices



Today an increasing number of utility meters (gas measuring instruments, water measuring instruments, electricity measuring instruments, and heat measuring instruments) are connected to ancillary devices such as communication modules transmitting the totalized value by the measuring instrument to a server at the utility company.

Although many of these devices are by themselves not under the scope of the MID, article 8.1 of Annex I of the MID states that “the metrological characteristics of the measuring instrument shall not be influenced in any inadmissible way by connecting it to any other device, by any feature of the connected device itself or by any remote device that communicates with the measuring instrument”.

Based on article 8.1 of Annex I of the MID the manufacturers should therefore define conditions under which ancillary devices can be connected to the measuring instrument. This needs to be evaluated by a Notified Body. This guide aims to provide guidance on the conditions needed to be specified to allow a measuring instrument to be connected to a device and the evaluation based on those conditions by the Notified Body.

AUTHORED BY: Working Group 11

Unless otherwise stated, the English version of each publication should be taken as the official version.

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