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5. Non-automatic weighing instrument (NAWI)
Several concepts coexist for the realization of this architecture, in particular starting from the load balancer device:
mechanical design using either the acceleration of gravity , or the restoring forces of a spring for example ;
magnetic design using magnetic pots or vibrating strings ;
electronic design using strain gauges.
Fully mechanical weighing instruments are no longer the main concern of manufacturers' design offices. However, it should be noted that :
the number of mechanical weighing instruments in current use is...
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Non-automatic weighing instrument (NAWI)
Regulations
European Directive 2014/31/EU of the European Parliament and of the Council of February 26, 2014 on the harmonization of the laws of the Member States relating to the making available on the market of non-automatic weighing instruments (OJEU of March 29, 2014).
European Directive No. 90/384/EEC of June 20, 1990 on the harmonization of the laws of the Member States relating to non-automatic weighing...
Statistical and economic data
1. Standards
A working standard can be either a weight or a standard mass.
Weight is a legally marked mass; its shape (dimensions), composition (material), nominal value, maximum permissible error and marking are regulated.
A marked mass is a material object used to determine the mass of a body. A marked mass is not required to meet...
Standards and norms
European standard ( http://www.afnor.fr )
- Aspects métrologiques des instruments de pesage à fonctionnement non automatique. - NF EN 45501 - 2015
- Critères généraux pour le fonctionnement des différents types d'organismes procédant à l'inspection. - NF EN ISO/CEI 17020...
International standards
Directory
Bureau de la métrologie (part of the Ministry of the Economy, Industry and the Digital Economy and the General Directorate for Enterprise)
http://www.entreprises.gouv.fr/metrologie/
International Organization of Legal Metrology (OIML)
...Websites
EUROPA, European Union server
Official Journal of the European Union
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