BS EN ISO 6416:2017:2018 Edition
$198.66
Hydrometry. Measurement of discharge by the ultrasonic transit time (time of flight) method
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 66 |
This document describes the establishment 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 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 focuses on open channel flow measurement. IEC 60041 covers the use of the technique for full pipe flow measurement.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 4 | European foreword Endorsement notice |
| 7 | Foreword |
| 8 | 1 Scope 2 Normative references 3 Terms and definitions 4 Applications 4.1 Types of applications |
| 9 | 4.2 Attributes and limitations 5 Method of measurement 5.1 Discharge |
| 10 | 5.2 Calculation of discharge from the transit-time measurement 6 Flow velocity determination by the ultrasonic (transit time) method 6.1 Principle |
| 12 | 6.2 Sound propagation in water 6.2.1 General |
| 13 | 6.2.2 Speed of sound in water 6.2.3 Propagation losses |
| 15 | 6.2.4 Signal path bending |
| 16 | 6.2.5 Reflection |
| 17 | 7 Gauge configuration 7.1 General 7.2 Single-path systems |
| 18 | 7.3 Multi-path systems 7.4 Crossed-path systems |
| 20 | 7.5 Reflected-path systems |
| 21 | 7.6 Systems using transponders |
| 22 | 7.7 Wireless systems (if a cable crossing is not possible) |
| 23 | 7.8 Systems using divided cross-sections 7.9 Sloping paths |
| 24 | 8 Determination of discharge 8.1 Single-path systems |
| 25 | 8.2 Multi-path systems 8.2.1 General |
| 26 | 8.2.2 Mid-section method |
| 27 | 8.2.3 Mean-section method |
| 28 | 8.3 Systems with transducers in the channel |
| 29 | 9 System verification and calibration |
| 30 | 10 Site selection 11 Site survey — Before design and construction 11.1 General 11.2 Visual survey |
| 31 | 11.3 Survey of the cross-section 11.4 Survey of velocity distribution 11.5 Survey of signal propagation 12 Operational measurement requirements 12.1 General |
| 32 | 12.2 Basic components of flow determination 12.3 Water velocity determination 12.4 Determination of water stage or depth |
| 33 | 12.5 Determination of mean bed level |
| 34 | 12.6 Channel width 13 Gauging station equipment 13.1 General |
| 35 | 13.2 Design and construction of equipment 13.2.1 Transducers |
| 36 | 13.2.2 Transducer cables 13.3 Reflectors |
| 39 | 13.4 Civil engineering works 13.5 Signal timing and processing 13.5.1 General 13.5.2 Signal-to-noise ratio |
| 40 | 13.5.3 Signal maintenance (gain control) 13.5.4 Signal detection |
| 41 | 13.5.5 Post-detection filtering 13.6 System self-checking |
| 42 | 13.7 Site-specific data (or site parameters) 13.8 Clock and calendar 13.9 System performance criteria 13.9.1 General |
| 43 | 13.9.2 Operating environment 13.9.3 Water environment 13.9.4 Mechanical environment 13.9.5 Extreme environmental conditions 13.9.6 Power source 13.9.7 Measurement uncertainty |
| 44 | 13.10 System output 13.10.1 Local display 13.10.2 Local record 13.10.3 Remote record 13.10.4 Diagnostic information 13.11 Installation |
| 45 | 13.12 Commissioning 13.13 Operating manual |
| 46 | 13.14 Maintenance |
| 47 | 14 Measurement uncertainties 14.1 General 14.2 Definition of uncertainty |
| 48 | 14.3 Uncertainty in discharge 14.3.1 Uncertainty equation |
| 49 | 14.3.2 Effective number of paths 14.3.3 Uncertainty in the line velocity, Ulv 14.3.4 Uncertainty in the channel width estimation, Uw |
| 50 | 14.3.5 Examples of uncertainty estimation |
| 51 | 14.3.6 Uncertainty estimate at low flow |
| 52 | 14.3.7 Uncertainty estimate at high flow |
| 54 | Annex A (informative) Principle of measurement uncertainty |
| 61 | Annex B (informative) Performance guide for hydrometric equipment for use in technical standard examples |
| 65 | Bibliography |
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BS EN ISO 6416:2017 – TC:2020 Edition
Tracked Changes. Hydrometry. Measurement of discharge by the ultrasonic transit time (time of flight) method…
