ISO INTERNATIONAL STANDARD 21018-4 Second edition 2019-08 Hydraulic fluid power Monitoring the level of particulate contamination in the fluid Part 4: Use of the light extinction technique Transmissions hydrauliques - Surveillance du niveau de pollution particulairedesfluides Partie 4: Technique d'absorption de lumiere Reference number IS0 21018-4:2019(E) IS @ IS0 2019 IS0 21018-4:2019(E) COPYRIGHTPROTECTEDDOCUMENT @IS02019 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 below or Iso's member body in the country of the requester. ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+41227490111 Fax: +4122 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved