| Overview |
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Ultrasonic flowmeters measure the traveling times (transit time models) or the frequency shifts(Doppler models) of ultrasonic waves in a pre-configured acoustic field that the flow is passing through to determine the flow velocity. Ultrasonic flowmeters can be categorized into two types based on the installation method: clamped-on and inline. The clamped-on type is located outside of the pipe and there are no wetted parts. It can easily be installed on existing piping systems without worrying about corrosion problems. Clamped-on designs also increase the portablility of the flowmeter. The inline type, on the other hand, requires fitting flanges or wafers for installation. However, it usually offers better accuracy and its calibration procedures are more straightforward. |
| Further Information |
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Both transit time and Doppler ultrasonic flowmeters measure changes in acoustic fields generated by the transducer(s) of the flowmeter and altered by the passing fluid flow to calculate the flow velocity.
The transit time ultrasonic flowmeters measure variations of traveling time of ultrasonic waves while the Doppler ultrasonic flowmeters measure frequency shifts in a pre-configured acoustic field. See Transit Time Ultrasonic Flowmeter and Doppler Ultrasonic Flowmeter for more details. |
| Common Specifications | ||||||||||||||||||||||||||||||||||||
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Common specifications for commercially available ultrasonic flowmeterss are listed below:
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| Pros and Cons | ||||||||||||||||||||||
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