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How ultrasonic flowmeters work
Transit-time ultrasonic flowmeters use two transducers mounted on the outside of a full pipe. Each transducer alternately sends and receives an ultrasonic signal through the liquid. The signal travelling downstream moves slightly faster than the signal travelling upstream.
The transmitter measures this transit-time difference and calculates the average liquid velocity and volumetric flow rate. Because clamp-on transducers do not enter the pipe, installation can be completed without cutting the pipeline or directly contacting the measured liquid.
Accurate measurement also depends on correct pipe diameter, wall thickness and transducer spacing. Air bubbles, suspended solids or poor acoustic coupling may weaken the ultrasonic signal and reduce measurement stability.
Applications & Industries
Multi-Parameter Water Quality Monitoring for a Building Project in Dubai
Integrated Flow and Water Quality Monitoring for an RO System in Indonesia
Inline Wastewater Turbidity Monitoring for a Treatment Pipeline in Peru
Supmea Multi-Parameter Monitoring Supports Water Treatment at an International Airport in Argentina
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SUP-MF Thermal mass flowmeter
Frequently Asked Questions
What liquids can transit-time ultrasonic flowmeters measure?
They are best suited for full pipes containing relatively clean, homogeneous liquids with limited bubbles or suspended solids.
What is the difference between transit-time and Doppler measurement?
Transit-time uses upstream and downstream sound travel times. Doppler uses echoes reflected by suspended particles in moving water.
Does a clamp-on ultrasonic flowmeter require pipe cutting?
No. Clamp-on transducers are mounted outside the pipe, allowing installation without cutting the pipeline or stopping the process.
Which model is suitable for temporary flow testing?
The SUP-2100H handheld model is designed for portable flow surveys, commissioning and comparison measurements.
Which model is suitable for continuous monitoring?
SUP-1158S and SUP-FSC400 are designed for fixed, continuous liquid-flow monitoring.
Can Supmea ultrasonic flowmeters measure heating or cooling energy?
Selected FSC400 configurations support heat measurement when used with suitable temperature sensors.
Can an ultrasonic flowmeter measure open-channel flow?
Yes. SUP-FSD300 measures flow velocity, liquid level and temperature in channels, streams, rivers and selected pipelines.
