Ultrasonic flowmeters can measure liquids containing small amounts of air bubbles or suspended solid particles, but the measuring performance depends on the concentration, size, and distribution of these bubbles or solids, as well as the flow conditions.
Ultrasonic flowmeters operate by transmitting and receiving ultrasonic signals through the fluid. Excessive air bubbles or high concentrations of solid particles can attenuate or scatter the ultrasonic signal, which may result in unstable readings, reduced accuracy, or loss of signal.
For transit-time ultrasonic flowmeters, the liquid should be relatively clean. A small amount of fine bubbles or particles is acceptable, but high gas content or heavy solids may significantly affect measurement reliability.
For Doppler ultrasonic flowmeters, the presence of suspended particles or bubbles is actually required, as the measurement principle is based on the reflection of ultrasonic signals from these moving particles. Therefore, Doppler ultrasonic flowmeters are more suitable for liquids with higher solid or bubble content, although their accuracy is generally lower than that of transit-time types.
In applications with fluctuating gas or solid content, it is recommended to:
Select the appropriate ultrasonic measurement principle (transit-time or Doppler);
Install the flowmeter at a location with stable flow and minimal air accumulation;
Avoid installation near pumps, valves, or vertical upward flows where bubbles may concentrate.
In summary, ultrasonic flowmeters can be used for liquids containing bubbles or solid particles within certain limits, but proper model selection and installation are critical to ensure reliable and accurate measurement.
Post time: Jan-29-2026