What Is an Ultrasonic Flowmeter?
An ultrasonic flowmeter uses sound waves to determine the flow velocity of a fluid. Depending on the design, it can measure liquids or gases, with different models suited to different process conditions.
One important benefit is that certain ultrasonic flowmeters can be installed on the outside of a suitable pipe. These clamp-on instruments can measure flow without cutting into the pipeline or bringing the sensor into direct contact with the fluid. Endress+Hauser
How Do Ultrasonic Flowmeters Work?
Two common ultrasonic measurement methods are transit-time and Doppler.
Transit-time ultrasonic flowmeters compare the travel time of ultrasonic signals moving with and against the flow. The difference helps determine the fluid’s velocity. This method is often used with suitable, relatively clean fluids.
Doppler ultrasonic flowmeters detect changes in reflected sound waves caused by particles or gas bubbles carried in the fluid. They can be suitable for some liquids containing these reflectors.
Choosing the correct measurement method is essential. The two technologies do not work equally well with every fluid. Endress+Hauser
Benefits of Ultrasonic Flow Measurement
- Non-invasive options: Clamp-on sensors can avoid pipe cutting and process interruption.
- No moving parts in the fluid: Many designs reduce maintenance associated with mechanical measuring elements.
- Flexible installation options: Inline, insertion, and clamp-on designs address different applications.
- Useful for existing pipelines: Suitable clamp-on instruments can help with flow surveys and monitoring without major pipe modifications.
These benefits depend on the specific model, fluid, pipe construction, and installation.
Where Are Ultrasonic Flowmeters Used?
Potential applications include water distribution, cooling-water systems, water and wastewater treatment, building services, and industrial process monitoring. Other specialist models may support gas or challenging temperature applications.
What Should You Check Before Buying?
Confirm the fluid type, pipe material, outside diameter, wall thickness, pipe lining, temperature, pressure, and expected flow range. For clamp-on meters, sensor placement, acoustic conditions, pipe condition, and the manufacturer’s installation requirements can strongly affect the measurement.
Also confirm the required accuracy, output signal, power supply, and whether the meter is intended for permanent installation or temporary measurement.
Need help choosing an ultrasonic flowmeter? Share your pipe details and process requirements with Accurate Flowmeters to explore suitable models.
