ISO INTERNATIONAL STANDARD 6686 Secondedition 1995-05-01 ANsl Internat Doc Sec Equipment for crop protection Antidrip devices Determination of performance Materiel de protection des cultures - Antigouttes Détermination des performances TSO Reference number ISO 6686:1995(E) No reproduction or networking permitted without license from IHS Not for Resale ISO 6686:1995(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through Iso which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IsO 6686 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry. Subcom- mittee SC 6, Equipment for crop protection. This second edition cancels and replaces the first edition (Is0 6686:1981), of which it constitutes a technical revision. Annex A forms an integral part of this International Standard. @ISO1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanicai, including photocopying and microfilm, without permission in writing from the publisher. International OrganizationforStandardization CasePostale56·CH-1211Geneve20·Switzeriand Printed in Switzerland No reproduction or networking permited without license from IHS Not for Resale INTERNATIONAL STANDARD ISO ISO 6686:1995(E) Equipment for crop protection --- Antidrip devices Determination of performance 1 Scope 5 Tests This International Standard specifies a test method to determine, on the one hand, the effect of fitting 5.1 Uniformity of flowrates obtained with antidrip devices on nozzle flowrates, and, on the other hand, the opening and closing pressures. two nozzles and different antidrip devices of same type It applies to antidrip devices of agricultural sprayer nozzles, except for hand-held or hand-operated sprayers. 5.1.1 Choice of nozzles 2 Test liquid For a pressure of o,3 MPa, choose one nozzle with a minimum flowrate of 1 I/min and one nozzle with a 2.1 maximum flowrate of 5 I/min, where this maximum Clean water, free from solids in suspension. flowrate is at least three times the minimum flowrate. 3 Apparatus The complete designation of the two nozzles used shall appear in the test report. 3.1 Pressure gauges, allowing the pressure to be measured with a precision of ± 1 % within the range of 0,03 MPa to 0,5 MPa. 5.1.2 Sampling of antidrip devices 3.2 Collection vessel for each nozzle. Select at random 20 antidrip devices of the same type from a batch of 200. The sampling conditions shall be 3.3 Measuring cylinder or balance, to measure the indicated in the test report, in particular the stock size, quantity of liquid collected. the place of sampling, etc. 3.4 Stopwatch. A second sampling of 20 antidrip devices shall be taken by an authorized person of a test centre, to cover the case of a problem with the first sample. General test conditions 4.1 Temperature 5.1.3 Test procedure The temperatures of the water and room air shall be Measure, at the reference pressure of 0,3 MPa, the between10°Cand25°C. flowrate of both nozzles without the antidrip devices and the flowrates when the antidrip devices of the 4.2 Pressures sample are attached in succession to the two nozzles Each pressure of the liquid shall remain constant with The volume dischar