ISO INTERNATIONAL STANDARD 7971-3 Second edition 2019-02 Cereals Determination of bulk density, called mass per hectolitre Part 3: Routine method Céreales - Détermination de la masse volumique, dite masse a I'hectolitre- Partie 3:Meéthode pratique Reference number ISO 7971-3:2019(E) ISO @ IS0 2019 IS0 7971-3:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 7971-3:2019(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references ..1 3 Terms and definitions 4 Principle ..1 5 Apparatus. ..2 6 Procedure .2 6.1 General .2 6.2 Hand-operated instruments. 2 6.3 Automatic instruments 3 6.4 Expression of results 3 7 Precision .3 7.1 Interlaboratory trial .3 7.2 Repeatability .3 7.3 Reproducibility 4 7.4 Comparison of two groups of measurements in one laboratory .4 7.5 Comparison of two groups of measurements in two laboratories 4 7.6 Uncertainty .4 8 Test report ..5 Annex A (informative) Description of dimensions and use of KERN .6 Annex B (informative) Description of dimensions and use of Nilema litre ..11 Annex C (informative) Results of interlaboratory tests ..14 Bibliography ..16 @ IS0 2019 - All rights reserved ii