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2. Full pipe flow measurement
2.1 How transit time difference measurement works
2.1.1 General principle of a measuring rope
A measuring string consists of two opposing probes facing each other, the first placed upstream (probe A), the second downstream (probe B).
Depending on its design, the flowmeter emits on one of the two probes either a wave train of about ten alternations, or (the technique most often used) an excitation pulse with an amplitude of 100 to 400 V and a duration of 0.25 to 3 µs (figure
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Full pipe flow measurement
Conclusion
Bibliography
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Standards and norms
- Measuring fluid flow in closed conduits – Ultrasonic meters for liquids. ISO - ISO 12242 - 2012
- Hydrometry – Flow measurement by the ultrasonic transit time method (time of flight). ISO - ISO 6416 - 2017
- Essai de réception sur place des turbines hydrauliques, pompes d'accumulation et pompes-turbines, en vue de la détermination de leurs performances hydraulique (annexe J : méthode acoustique de mesurage...
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