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Ultrasonic Flowmeters

An ultrasonic flow meter measures the velocity of a fluid with ultrasound to calculate volume flow.

 

Sierra Ultrasonic Flow Meters

InnovaSonic 207i

InnovaSonic 207i

Ultrasonic Digital Liquid Flow Meter

The 207i calculates thermal energy / BTU flow energy & provides you with the highest accuracy measurements possible to manage energy costs.
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InnovaSonic 203

InnovaSonic 203

Ultrasonic Liquid Flow Meter

This economical ultrasonic liquid flow meter delivers a highly accurate and repeatable flow measurement for liquids at an economical price.
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InnovaSonic 210

InnovaSonic 210

Portable Transit Time Ultrasonic Flowmeter

The handheld battery powered InnovaSonic 210 is ideal for precisely measuring a wide range of liquid flows in pipes up to 6000 mm.
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SiteLab Ultrasonic Flow Meters

SL1168

SL1168

Dedicated Transit Time Ultrasonic Flowmeter

The SL1168 is a universal transit-time flowmeter that has been designed using FPGA chip and low-voltage broadband pulse transmission.
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SL1278P

SL1278P

Portable Transit Time Ultrasonic Flowmeter

The SL1278P replaces the SL1168P, it can reliably measure liquids containing moderate amounts of suspended solids with a SD Card for data logging.
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SL1188

SL1188

Transit Time Ultrasonic Flow Meter

The SL1188 offers low power consumption and high reliability and can be configured via the keypad without any additional programming.
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D118i

D118i

Dedicated Transit Time Ultrasonic Flowmeter

The D118i Ultrasonic Flowmeter is a universal transit-time flowmeter designed using ARM COMA technology and low-voltage broadband pulse transmission.
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SL1288i

SL1288i

Handheld Ultrasonic Flowmeter

The SL1288i is a portable ultrasonic flow meter that has been designed to enable to user to measure flow checks at many points.

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SL3488D Plus

SL3488D Plus

Universal transit Time Ultrasonic Flowmeter

The SL1168 is a universal transit-time flowmeter that has been designed using FPGA chip and low-voltage broadband pulse transmission.

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Ultrasonic flowmeters use sound waves to determine the velocity of a fluid flowing in a pipe. At no flow conditions, the frequencies of an ultrasonic wave transmitted into a pipe and its reflections from the fluid are the same. Under flowing conditions, the frequency of the reflected wave is different due to the Doppler effect. When the fluid moves faster, the frequency shift increases linearly. The transmitter processes signals from the transmitted wave and its reflections to determine the flow rate.

Transit time ultrasonic flowmeters send and receive ultrasonic waves between transducers in both the upstream and downstream directions in the pipe. At no flow conditions, it takes the same time to travel upstream and downstream between the transducers. Under flowing conditions, the upstream wave will travel slower and take more time than the (faster) downstream wave. When the fluid moves faster, the difference between the upstream and downstream times increases. The transmitter processes upstream and downstream times to determine the flow rate

Another method in ultrasonic flow metering, also not suited for very low flowrates, is the use of the Doppler shift that results from the reflection of an ultrasonic beam off sonically reflective materials, such as solid particles or entrained air bubbles in a flowing fluid, or the turbulence of the fluid itself, if the liquid is clean.