Overview
ABSTRACT
Industry makes use of many automatic weighing devices. They are used to sort pre-packages, fill drums, cans, weigh minerals continuously, and weigh moving trains. They allow the weighing of large amounts of material with no human intervention. This paper reviews the operation of these special devices, the essential requirements that are applicable, and their verification.
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Read the articleAUTHOR
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Denis LOUVEL: Scientific metrology product manager - Mettler-Toledo SAS, Viroflay, France
INTRODUCTION
Automatic weighing instruments (IPFA) are instruments that perform a series of weighing operations, without the intervention of an operator and according to a pre-set program.
Their mode of operation is adapted to the use for which they have been designed, and to the types of product they are designed to handle.
Integrated into manufacturing and/or handling lines, they represent major investments that make an effective contribution, from both the technical and economic points of view and over a wide range of weights, to managing the storage and packaging of a wide variety of products: powders, granules, lumps, etc. in a very wide range of industrial and food sectors: chemicals, mining resources, building materials, quarries, harvesting and marketing – wholesale and retail – of agricultural products, pharmaceuticals, environment (waste treatment), food sectors, etc.
At the end of the article, readers will find a glossary of important terms and expressions.
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KEYWORDS
totalizing | Automatic catchweighing | Gravimetric filling | Automatic rail-weighbridges | Weighing road vehicles in motion | Metrology | industry | regulation | Commercial transations
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Physical measurements
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Automatic weighing instrument
IPFA categories
Bibliography
- (1) - Bulletin OIML - MID European Directive for Measuring Instruments – A new challenge to industry and to the state. - Volume XLI, numéro 4 (Octobre 2000).
Also in our database
Standards and norms
AFNOR standards
- Aspects métrologiques des instruments de pesage à fonctionnement non automatique. - NF EN 45501 - 2015
- Automatic weighfeeders – Part 1: Metrological and technical requirements. - NF E12-010-1 - 1998
- Automatic weighfeeders – Part 2: Test methods, conditions and procedures. - NF E12-010-2 - 1998
- Continuous handling equipment – Belt conveyors designed to be...
Regulations
Directive no. 2004/22/EC of March 31, 2004 on measuring instruments (text repealed for the "metrological control of instruments" category).
Directive no. 75/106/EEC of December 19, 1974 on the approximation of the laws of the Member States relating to the making-up by volume of certain prepackaged liquids. Amended by directives no. 78/891/EEC of September 28, 1978, no. 88/316/EEC of June 7, 1988 and...
Data
1. European regulations
Depending on their intended use, automatic weighing instruments (AWIs) may be subject to government control at the design, construction, installation and use stages.
The new approach to harmonizing national legislation for AFPIs is similar to that for NAWIs. Its aim is to lay down essential metrological and performance requirements, to guarantee effective protection...
Directory
Manufacturers – Suppliers – Distributors
Checkweigher manufacturers
Sartorius-Vivascience (France)
http://www.sartorius-france.com/
Mettler-Toledo, Garvens (France)
...
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