OIML R 60 - Célula de Carga_Suplemento

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Metrological regulation for load cells:CERTIFICATE TRANSFORMATION REQUIREMENTS

Réglementation métrologique des cellules de pesée:EXIGENCES SUR LA TRANSFORMATION DES CERTIFICATS

S u p p l e m e n t t o O I M L R 6 0 E d i t i o n 2 0 0 0 ( E

) :

C E R T I F I C

A T E T R A N S F O R M A T I O N

R E Q U I R E M E N T S

Supplement toOIML R 60

Edition 2000 (E)

ORGANISATION INTERNATIONALE

DE MÉTROLOGIE L ÉGALE

INTERNATIONAL ORGANIZATIONOF L EGAL METROLOGY

CERTIFICATE

TRANSFORMATION

REQUIREMENTS



Supplement to OIML R 60: 2000 (E) Certificate transformation requirements

2

Supplement to OIML R 60 (2000) Metrological regulation for load cells :

Certificate transformation requirements

1 Introduction

OIML Recommendation R 60 (2000) incorporates a number of changes to the 1991 edition, which is now thereforesuperseded. However, OIML certificates issued against R 60 (1991) will remain valid without limitation and willremain applicable in certain countries or regions until national and regional regulations are aligned withR 60 (2000). It should also be noted that R 60 (1991) certificates may be issued up to the end of 2000. In parallel,R 60 (2000) certificates may be issued to manufacturers as of March 2000, assuming they have manufactured loadcells that meet the requirements of the new Recommendation.

Therefore, manufacturers who hold R 60 (1991) certificates and whose load cells also meet the requirements of R 60

(2000) may wish to receive R 60 (2000) certificates without having to be subjected to all the examinations and testsof R 60 (2000), since a number of the requirements are the same as those in R 60 (1991).

This document identifies those requirements in R 60 (2000) that have changed compared with R 60 (1991), as wellas new requirements.

Based on this document, an Issuing Authority that issued an R 60 (1991) certificate for a given model of load cellto a given manufacturer may consider the possibility of issuing an R 60 (2000) certificate without performing all thetests and examinations which were carried out for the R 60 (1991) certificate. This is conditional on a manufactureror representative being able to submit a model and documentation providing evidence that it is the same model asevaluated for the R 60 (1991) certificate and test report. Changes in or additions to items, such as the markings orindications on the load cell to conform to requirements of R 60 (2000) and not affecting the load cell performance,shall be permitted.

In the same way, the Issuing Authority may decide to use the former test report with supplements for new anddifferent examinations and tests.

2 Summary of additional requirements

2.1 Load cell information

R 60 (1991) required certain information about the load cell (see table starting on page 4) to be provided, either onthe load cell or in accompanying documentation. However, it did not require any markings to be on the body of the

load cell other than a serial number to identify the load cell with the documentation containing the requiredinformation.

R 60 (2000) requires four items to be marked on the load cell and in the accompanying documentation:

• name or trademark of manufacturer;

• manufacturer’s designation or load cell model;

• serial number; and

• maximum capacity of the load cell, Emax

.

Other information about the load cell is required to be provided in the accompanying documentation (see table).The following information is required in R 60 (2000) which was not required in R 60 (1991):

• the humidity symbol, if necessary (CH or no symbol, SH or NH); and

• the value of the apportionment factor, pLC, which is required if not equal to 0.7.R 60 (2000) no longer requires the manufacturer’s address to be specified.



Certificate transformation requirements Supplement to OIML R 60: 2000 (E)

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2.2 Temperature limits

R 60 (1991) required class A and B load cells to perform within the limits of error over the temperature range + 10 °Cto + 30 °C and class C and D load cells over the range – 10 °C to + 40 °C (unless otherwise specified).

R 60 (2000) requires all classes of load cell to perform within the limits of error over the temperature range – 10 °Cto + 40 °C (unless otherwise specified).

2.3 Definition of load cell family and group within a load cell family to be covered on an OIML certificate

R 60 (1991) did not define these concepts.

R 60 (2000) contains a definition of what comprises a “load cell family” for a particular model, the requirements forwhich cells in the family are to be tested, and what ranges can be covered on the certificate, as below:

• Lowest capacity of the model tested

R 60 (2000) requires the lowest capacity within a group of cells to be tested. If an R 60 (1991) certificatecovers a group of load cells and the lowest capacity has not been tested, the manufacturer may be requiredto have the lowest capacity tested.

• Range of load cells covered for a model on a certificate

The ratio of the lowest capacity tested to the next capacity tested on the certificate can be greater than 5:1 butnot greater than 10:1.

• Maximum range of capacities covered for a model on a certificate for one capacity tested

This ratio of the maximum capacity covered to the capacity tested shall be less than or equal to 5:1.

3 Comparison of new or revised requirements in R 60 (2000)

Tables of the new or revised requirements in R 60 (2000) are given on the following pages. For each item, therequirements in R 60 (2000) are detailed alongside those of R 60 (1991).

The far right column under the heading “Does R 60 (1991) certificate comply with R 60 (2000) on this item?”contains one of three statements:

Yes: Yes, models of load cell for which there is an existing R 60 (1991) OIML certificate willcomply with R 60 (2000) on this item.

Re-evaluate: Models of load cell for which there is an existing R 60 (1991) OIML certificate may or maynot comply with R 60 (2000) on this item. The model and/or documentation will need to bere-evaluated to determine compliance.

New in R 60 (2000): These items did not exist in R 60 (1991), and must therefore be considered. This may requireon a case by case basis a review of the documentation, a visual examination, or tests of thetype submitted.







Supplement to OIML R 60: 2000 (E) Certificate transformation requirements

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Certificate transformation requirements Supplement to OIML R 60: 2000 (E)

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OIML R 60 - Célula de Carga_Suplemento