ISO INTERNATIONAL STANDARD 11171 Fifth edition 2022-03 Hydraulic fluid power Calibration of automatic particle counters for liquids Transmissions hydrauliques Etalonnage des compteurs automatiquesde particules en suspension dans les liquides Referencenumber IS0 11171:2022(E) [So @ ISO 2022 Copyright Intemafional Organization for Standardizatior IS0 11171:2022(E) COPYRIGHTPROTECTEDDOCUMENT @IS02022 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 anyform 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: +41 22 749 01 11 Email: [email protected] Website:www.iso.org Published in Switzerland Copyrigh ilhlmafinal Organization fce Standardzation IS02022-Allrightsreserved IS0 11171:2022(E) Contents Page Foreword .iv Introduction. ..vi 1 Scope. ..1 2 Normativereferences 3 Termsand definitions ..1 4 Materials and equipment ..3 5 Sequenceof APCcalibrationprocedures .5 6 Sizing calibration procedure .9 7 Data presentation ..19 8 .20 Identificationstatement AnnexA (normative)PreliminaryAPCcheck .21 Annex B (normative) Coincidence error procedure .25 Annex C (normative) Flow rate limit determination .29 AnnexD (normative)Resolution determination .34 AnnexE (normative)Verificationofparticle-countingaccuracy ..39 Annex F (normative) Preparation and verification of bottles of secondary calibration .42 suspensions AnnexG (normative)Dilutionofcalibrationsuspensionsamples .46 AnnexH (informative) Verification ofparticle size distribution ofcalibration samples ..49 Bibliography 51 iii Copyrigh Intemalinal orghzIS0i222ara2AJl rights reserved