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Weight Accuracy Classifications

 
What are the weight accuracy classes?

What are weight classes?


Classification systems are used to specify most aspects of modern weights and weight sets - including the characteristics of the material from which they should be manufactured, the mass intervals in a set of weights, the intended use and potential in-service accuracy.


What is OIML Recommendation R 111?


In Europethe weight classification system adopted is that produced by the International Organization of Legal Metrology (OIML), known as document OIML Recommendation R 111. It describes the metrological aspects of reference standard weights with recommendations for seven classes of weights - from high quality reference standards at Class E1 to those used in industrial settings at Class M3. The full classification includes classes E1, E2, F1, F2, M1, M2, and M3 in tiers of uncertainty or tolerances - for example a Class E1 weight would normally be used as a standard for the calibration of a Class E2 weight (of the same nominal mass).
OIML R 111 describes the principal physical characteristics and metrological requirements for weights which are to be used:

  • for the verification of weighing instruments
  • for the verification of weights of a lower class of accuracy
  • with weighing instruments

The nominal mass of the weights covered by this Recommendation range from 1 milligram (mg) to 50 kilograms (kg) and the document also specifies the methods and equipment to be used for checking the conformity of weights.

 

The OIML weight classes are:


Class E1  weights intended to ensure traceability between national mass standards (with values derived from the International Prototype of the kilogram) and weights of class E2 and lower (ie F1, F2 ...). Class E1 weights or weight sets shall be accompanied by a calibration certificate.
 
Class E2   weights intended for use in the initial verification of class F1 weights and for use with weighing instruments of accuracy class I.Class E2 weights or weight sets shall always be accompanied by a calibration certificate. They may be used as class E1 weights if they comply with the requirements for surface roughness and magnetic susceptibility and magnetization for class E1 weights and their calibration certificate gives the appropriate data.
 
Class F1   weights intended for use in the initial verification of class F2 weights and for use with weighing instruments of accuracy class I and class II.
 
Class F2   weights intended for use in the initial verification of class MI and possibly class M2 weights. Also intended for use in important commercial transactions (eg precious metals and stones) on weighing instruments of accuracy class II.
 
Class M1   weights intended for use in the initial verification of class M2 weights, and for use with weighing instruments of accuracy class III.
 
Class M2   weights intended for use in the initial verification of class M3 weights and for use in general commercial transactions and with weighing instruments of accuracy class III.
 
Class M3  weights intended for use with weighing instruments of accuracy class IIII.
 
Classes M3 and M2-3  weights 50 kg to 5 000 kg of lower accuracy intended for use with weighing instruments of accuracy class III.

 
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