News story

New standard for non-automatic weighing instruments

New standard, EN 45501:2015 Metrological aspects of non-automatic weighing instruments.

The new standard is now available from British Standards.

The new version is now a harmonised standard, the references having been published in the Official Journal of the European Union, the existing version will cease being a harmonised standard on 20 April 2016, i.e. there will be a short transitional period where both versions can be used.

This new harmonised standard, which aligns with the 2006 version of OIML R76, will be of interest to manufacturers of non-automatic weighing instruments as through its use Member States, as specified in Article 6 of Directive 2009/23/EC, and Article 12 of Directive 2014/32/EU, on non-automatic weighing instrument, are able to presume conformity with the essential requirements set out in Annex I, of the Directive, in respect of instruments which comply with the relevant national standards implementing the harmonised standards that meet those requirements.

The new standard contains some significant changes from the (current) 1992 version of BS EN 45501, these changes include:

  • an increase to 10 V/m for the RFI test

  • the introduction of the conducted immunity test

  • the introduction of the surge test

  • additional software requirements

  • some changes in the tests to be performed during initial verification, eg no discrimination test and only one tare test

  • the introduction of the modular approach, as part of the instrument rather than the entire instrument

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