EN ISO 6416:2017

European foreword
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Applications
5 Method of measurement
6 Flow velocity determination by the ultrasonic (transit time)
   method
7 Gauge configuration
8 Determination of discharge
9 System verification and calibration
10 Site selection
11 Site survey - Before design and construction
12 Operational measurement requirements
13 Gauging station equipment
14 Measurement uncertainties
Annex A (informative) - Principle of measurement uncertainty
Annex B (informative) - Performance guide for hydrometric
        equipment for use in technical standard examples
Bibliography

ISO 6416 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.ISO 6416 is not applicable to measurement in rivers with ice.NOTE ISO 6416 focuses on open channel flow measurement. IEC 60041 covers the use of the technique for full pipe flow measurement.