The vast majority of flow measurement applications are liquids with various concentration of bubbles or solids in a flow stream. Low cost employing low frequency transit-time pulses can successfully be used when the liquid is very clean with less than 1-2% solids/bubbles and fail when these concentrations exceed their limits. However in most application this technology works well. SmartmeasurementTM is the only manufacturer that uses both low frequency transit-time technologies and high frequency technologies. There is no reason to use more expensive high frequency transit-time techniques where lower low frequency techniques can effectively measure fluid flow.
SmartMeasurementTM’s AlsonicDSP family of ultrasonic flow meters that use Digital Signal Processing techniques and their patented “fine time measurement technologies” that involve sound waves to be beamed at picoseconds to ensure accurate measurements of liquids that contain solids or gas bubbles. The SmartMeasurementTM’s AlsonicDSP flow transmitters use Cross Correlation to erase noise and make 3-d cross sections of the flow profile’s travel speed through a pipe. It also allows users to use a Fast Fourier Transform technology, which allows for two signals to use the same frequency. This increases the accuracy of the flow rate measurement. Finally, SmartMeasurementTM’s AlsonicDSP ultrasonic flow meters can be used to measure fluids that contain up to 30 percent gas bubbles or solids.