Doppler Ultrasonic Flow Meter-Membrane Switch

Label:Ultrasonic, Flowmeter, Automation, Control, Difficult Liquids, Membrane Switch

Sep 28, 2020169626

Doppler Ultrasonic Flow Meter-Membrane Switch

Ultrasonic flow meters utilize sound waves to measure the velocity of a fluid from which the volumetric flow rate can be calculated. Unlike most flow meters, ultrasonic meters do not include any moving parts and thus are more reliable, accurate and provide maintenance free operation. Since ultrasonic signals can also penetrate solid materials, the transducers can be mounted onto the outside of the pipe offering completely non-invasive measurement eliminating chemical compatibility issues, pressure restrictions, and pressure loss.


Ultrasonic flow meters are affected by the acoustic properties of the fluid and can be impacted by temperature, density, viscosity and suspended particulates depending on the exact flow meter. Homogenous fluids, as well as, advanced digital signaling can eliminate many of the problems associated with noise and variations in liquid chemistry.


The specific flow rate is calculated by the difference between the frequency at which the ultrasonic wave is transmitted and the frequency at which the ultrasonic wave is received. Then, the water level is measured by the pressure sensor, and the water area is calculated by the water level and channel size. Finally, the velocity and area are integrated to calculate the final instantaneous flow rate.



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