EN ISO 6416-2017 Hydrometry - Measurement of discharge by the ultrasonic transit time (time of flight) method.pdf

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1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Hydrometry Measurement of discharge by the ultrasonic transit time (time of flight) method (ISO 6416:2017)BS EN ISO 6416:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6416 November 2017 ICS 17.120.20 Supe

2、rsedes EN ISO 6416:2005English Version Hydrometry - Measurement of discharge by the ultrasonic transit time (time of flight) method (ISO 6416:2017) Hydromtrie - Mesure du dbit par la mthode du temps de transit ultrasonique (temps de vol) (ISO 6416:2017) Hydrometrie - Messung des Durchflusses mit dem

3、 Ultraschall-Laufzeitverfahren (Transit-time-/Time-of-flight-Verfahren) (ISO 6416:2017) This European Standard was approved by CEN on 22 August 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status

4、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, Germa

5、n). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia,

6、 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 a

7、nd United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. R

8、ef. No. EN ISO 6416:2017 ENational forewordThis British Standard is the UK implementation of EN ISO 6416:2017. It is identical to ISO 6416:2017. It supersedes BS EN ISO 6416:2005, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee CPI/113/1, Hydrometric m

9、ethods and instrumentation.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2

10、018 Published by BSI Standards Limited 2018ISBN 978 0 580 85091 2ICS 17.120.20Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2018.Amendments/corrige

11、nda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 6416:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6416 November 2017 ICS 17.120.20 Supersedes EN ISO 6416:2005English Version Hydrometry - Measurement of discharge by the ultrasonic transit time (time of flight)

12、method (ISO 6416:2017) Hydromtrie - Mesure du dbit par la mthode du temps de transit ultrasonique (temps de vol) (ISO 6416:2017) Hydrometrie - Messung des Durchflusses mit dem Ultraschall-Laufzeitverfahren (Transit-time-/Time-of-flight-Verfahren) (ISO 6416:2017) This European Standard was approved b

13、y CEN on 22 August 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national stand

14、ards 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 translation under the responsibility of a CEN member into its own language and no

15、tified to the CEN-CENELEC Management Centre has the same status as the official versions. 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,

16、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 COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-C

17、ENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6416:2017 EBS EN ISO 6416:2017EN ISO 6416:2017 (E) 3 European foreword This document (EN ISO 6416:2017) has be

18、en prepared by Technical Committee ISO/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,

19、 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

20、rights. This document supersedes EN ISO 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland,

21、 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 the United Kingdom. Endorsement notice The text

22、of ISO 6416:2017 has been approved by CEN as EN ISO 6416:2017 without any modification. BS EN ISO 6416:2017ISO 6416:2017(E)Foreword v1 Scope . 12 Normative references 13 Terms and definitions . 14 Applications . 14.1 Types of applications . 14.2 Attributes and limitations . 25 Method of measurement

23、25.1 Discharge . 25.2 Calculation of discharge from the transit-time measurement . 36 Flow velocity determination by the ultrasonic (transit time) method 36.1 Principle 36.2 Sound propagation in water 56.2.1 General 56.2.2 Speed of sound in water 66.2.3 Propagation losses . 66.2.4 Signal path bendin

24、g . 86.2.5 Reflection 97 Gauge configuration .107.1 General 107.2 Single-path systems . 107.3 Multi-path systems . 117.4 Crossed-path systems 117.5 Reflected-path systems . 137.6 Systems using transponders 147.7 Wireless systems (if a cable crossing is not possible) .157.8 Systems using divided cros

25、s-sections 167.9 Sloping paths . 168 Determination of discharge .178.1 Single-path systems . 178.2 Multi-path systems . 188.2.1 General. 188.2.2 Mid-section method .198.2.3 Mean-section method .208.3 Systems with transducers in the channel . 219 System verification and calibration .2210 Site selecti

26、on 2311 Site survey Before design and construction 2311.1 General 2311.2 Visual survey 2311.3 Survey of the cross-section 2411.4 Survey of velocity distribution . 2411.5 Survey of signal propagation . 2412 Operational measurement requirements .2412.1 General 2412.2 Basic components of flow determina

27、tion . 2512.3 Water velocity determination . 2512.4 Determination of water stage or depth 2512.5 Determination of mean bed level . 2612.6 Channel width . 27 ISO 2017 All rights reserved iiiContents PageBS EN ISO 6416:2017ISO 6416:2017(E)13 Gauging station equipment 2713.1 General 2713.2 Design and c

28、onstruction of equipment . 2813.2.1 Transducers.2813.2.2 Transducer cables 2913.3 Reflectors 2913.4 Civil engineering works 3213.5 Signal timing and processing . 3213.5.1 General. 3213.5.2 Signal-to-noise ratio .3213.5.3 Signal maintenance (gain control) 3313.5.4 Signal detection 3313.5.5 Post-detec

29、tion filtering 3413.6 System self-checking . 3413.7 Site-specific data (or site parameters) 3513.8 Clock and calendar 3513.9 System performance criteria . 3513.9.1 General. 3513.9.2 Operating environment . 3613.9.3 Water environment.3613.9.4 Mechanical environment . 3613.9.5 Extreme environmental co

30、nditions 3613.9.6 Power source 3613.9.7 Measurement uncertainty 3613.10 System output . 3713.10.1 Local display . 3713.10.2 Local record . 3713.10.3 Remote record .3713.10.4 Diagnostic information 3713.11 Installation . 3713.12 Commissioning 3813.13 Operating manual 3813.14 Maintenance . 3914 Measur

31、ement uncertainties 4014.1 General 4014.2 Definition of uncertainty . 4014.3 Uncertainty in discharge . 4114.3.1 Uncertainty equation 4114.3.2 Effective number of paths . 4214.3.3 Uncertainty in the line velocity, Ulv4214.3.4 Uncertainty in the channel width estimation, Uw.4214.3.5 Examples of uncer

32、tainty estimation 4314.3.6 Uncertainty estimate at low flow . 4414.3.7 Uncertainty estimate at high flow 45Annex A (informative) Principle of measurement uncertainty .47Annex B (informative) Performance guide for hydrometric equipment for use in technical standard examples 54Bibliography .58iv ISO 2

33、017 All rights reservedBS EN ISO 6416:2017ISO 6416:2017(E)ForewordISO (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 technical committee

34、s. Each member body interested in a subject for 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 Inter

35、national Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the diff

36、erent types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shal

37、l not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is

38、 information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organizat

39、ion (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 113, Hydrometry, Subcommittee SC 1, Velocity area methods.This fourth edition cancels and replaces the third edition (ISO 6416:2

40、004), which has been technically revised. The main changes from the previous edition are: the title has been changed; a new subclause (7.7) on wireless systems has been added; former subclauses 9.2 and 11.6 have been removed; Clause 10 on site selection has been revised; Annex A (Principle of measur

41、ement uncertainty) and Annex B (Performance guide for hydrometric equipment for use in technical standards) have been added. ISO 2017 All rights reserved vBS EN ISO 6416:2017Hydrometry Measurement of discharge by the ultrasonic transit time (time of flight) method1 ScopeThis document describes the e

42、stablishment and operation of an ultrasonic (transit-time) gauging station for the continuous measurement of discharge in a river, an open channel or a closed conduit. It also describes the basic principles on which the method is based, the operation and performance of associated instrumentation and

43、 procedures for commissioning.It is limited to the “transit time of ultrasonic pulses” technique, and is not applicable to systems that make use of the “Doppler shift” or “correlation” or “level-to-flow” techniques.This document is not applicable to measurement in rivers with ice.NOTE This document

44、focuses on open channel flow measurement. IEC 60041 covers the use of the technique for full pipe flow measurement.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references

45、, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 772, Hydrometry Vocabulary and symbolsISO 4373, Hydrometry Water level measuring devicesISO/TS 25377, Hydrometric uncertainty guidance (HUG)3 Terms and defin

46、itionsFor the purposes of this document, the terms and definitions given in ISO 772 apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: ISO Online browsing platform: available at https:/www.iso.org/obp IEC Electropedia: available at http:/www.el

47、ectropedia.org/4 Applications4.1 Types of applicationsa) Open channelsb) Multiple channelsc) Closed conduitsThis method does not need a man-made or natural control, as it does not rely upon the establishment of a unique relationship between water level and discharge.INTERNATIONAL STANDARD ISO 6416:2

48、017(E) ISO 2017 All rights reserved 1BS EN ISO 6416:2017ISO 6416:2017(E)4.2 Attributes and limitationsThe following attributes and limitations shall be considered when deploying this measuring system. Attributes1. Potential for high accuracy2. Tolerant of back water effects3. Able to measure multipl

49、e channels and combine results to give total flow4. Capable of determining individual velocities at distinct heights within the water column5. Visually unobtrusive6. Fish friendly7. Mains power supply not essential8. Intrinsically safe systems available for use in explosive atmospheres9. No obstruction or head loss10. Suitable for large range of channel widths and depths11. Potential for built in redundancy12. Potential for relatively low operating costsLimitations1. A site with an unstable cross section needs to be avoided if possible2