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An ultrasonic flowmeter is a measuring device used to determine the flow velocity of a fluid (liquid or sometimes gas) in a pipe, and to calculate the volumetric or mass flow rate.
Operating principle
It relies on the propagation of ultrasonic waves through the fluid:
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Transit-time method:
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Two piezoelectric transducers send and receive ultrasonic signals in the downstream and upstream directions.
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The difference in travel time (faster with the flow, slower against the flow) allows the calculation of the average fluid velocity.
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Doppler method:
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An ultrasonic wave is sent into the fluid.
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Suspended particles or bubbles scatter the signal, which is received with a frequency shift (Doppler effect).
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This frequency shift is proportional to the flow velocity.
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Ultrasonic flowmeter
An ultrasonic flowmeter is a measuring device used to determine the flow velocity of a fluid (liquid or sometimes gas) in a pipe, and to calculate the volumetric or mass flow rate.
Operating principle
It relies on the propagation of ultrasonic waves through the fluid:
-
Transit-time method:
-
Two piezoelectric transducers send and receive ultrasonic signals in the downstream and upstream directions.
-
The difference in travel time (faster with the flow, slower against the flow) allows the calculation of the average fluid velocity.
-
-
Doppler method:
-
An ultrasonic wave is sent into the fluid.
-
Suspended particles or bubbles scatter the signal, which is received with a frequency shift (Doppler effect).
-
This frequency shift is proportional to the flow velocity.
-
€0.00
Tax included
Installation types
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Clamp-on: sensors mounted outside the pipe (non-intrusive, easy to install, no network shutdown).
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In-line: sensors integrated into the piping (more accurate, but requires intervention on the pipeline).
Advantages
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No moving parts (low maintenance).
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No pressure loss in the network.
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Possible installation without shutdown (clamp-on version).
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Suitable for large pipe diameters.
Limitations
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Accuracy depends on the presence of bubbles/particles (depending on the method).
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Sensitive to temperature and installation quality.
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May be less suitable for low flow rates or very pure fluids (Doppler method).
