EN IS0 6416 EUROPEANSTANDARD NORME EUROPEENNE EUROPAISCHE NORM November 2017 ICS 17.120.20 Supersedes EN IS0 6416:2005 English Version Hydrometry - Measurement of discharge by the ultrasonic transit time (time of flight) method (IS0 6416:2017) Hydrométrie-Mesure du débit par la methode du Hydrometrie-MessungdesDurchflussesmitdem tempsdetransitultrasonique (tempsdevol)(Iso Ultraschall-Laufzeitverfahren (Transit-time-/Time-of- 6416:2017) flight-Verfahren)(IS06416:2017) This European Standard was approved by CEN on 22 August 2017 CENmembersarebound to complywiththeCEN/CENELECInternalRegulationswhich stipulatetheconditionsforgivingthis European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by Centrehas the samestatusasthe officialversions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPAISCHESKOMITEEFURNORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels @2017CEN All rights of exploitation in any form and by any means reserved Ref. No.EN ISO 6416:2017 E worldwide for CEN national Members. EN IS0 6416:2017 (E) European foreword This document (EN IS0 6416:2017) has been prepared by Technical Committee IS0/TC 113 "Hydrometry" in collaboration with Technical Committee CEN/TC 318 “Hydrometry" the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2018, and conflicting national standards shall be withdrawn at the latest by May 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes EN IS0 6416:2005. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of IS0 6416:2017 has been approved by CEN as EN IS0 6416:2017 without any modification. 3