Area Velocity Open Channel Ultrasonic Meter

Area Velocity Open Channel Ultrasonic Flow Meters

ALSONIC-AVM

SmartMeasurement’s ALSONIC-AVM system is an area-velocity meter that is used in conjunction with a user-supplied level transmitter to measure flow rates in open channels. The ALSONIC-AVM consists of an advanced DSP-based flow computer and four transducers. It uses the transit time difference of ultrasonic sound pulses to measure the open channel flow velocity. The ultrasonic pulses are transmitted upstream and downstream across the channel at an angle α between the flow direction and the sonic wave path, with the difference in the sonic wave’s transit time being directly proportional to the liquid velocity. 

The ALSONIC-AVM may be used in rectangular, circular, trapezoidal or other shaped channels. Since the transducers create almost no restriction, virtually no head loss is created. The advanced DSP-based flow computer with cross-correlation and FFT technology allows this system to work in the most difficult applications, including those involving liquids with high concentrations of suspended solids & air or a large noise component.

High Accuracy Open Channel Flow Meters: ALSONIC-AVM

Transit-Time Multipath Approach

SmartMeasurement’s ALSONIC-AVM revolutionizes open channel flow measurement. It operates on the principal Q = v ● A, where Q is flow rate, v is fluid velocity, and A is the cross-sectional area. This principle applies to both enclosed pipes and open channels.

ALSONIC-AVM Functionality

The system combines transit time ultrasonic transducers with a user-supplied level transmitter. Users input the channel width, and the device calculates the flow area using the level sensor’s height data. Velocity is measured by ultrasonic transducers, with up to four pairs activating as water levels rise, ensuring accurate flow rate calculations.

Key Advantages

The ALSONIC-AVM excels in accuracy, measuring both area and velocity precisely. Suitable for various fluid conditions, it can handle up to 30% solid content. This adaptability makes it a reliable choice for diverse open channel applications.

• Most accurate open channel measurement in the market: Accuracies of up to 0.5% of reading can be achieved for either clean or dirty liquids.
• Laser alignment tool: The Alsonic AVM comes with a laser alignment tool than can easily align pairs of transducers installed across the channel 
• Versatile Display Options: Graphic display providing signal strengths, sound speeds and various information pertaining to open channel measurements.

Key Features and Functionality

• Advanced Transit Time Transducers: Able to measure very clean liquids as well as dirty liquids of up to 30% particles or bubbles. 
• Ability to incorporate any Level Transmitter technologies: Users can choose any level technologies best suited for their application and connect the analog output to the SAVM flow computer for optimum Area Velocity Measurements.
• Versatility: User can choose from 2-4 pairs of transducers for conduits of greater than 1.5 meters and up to 40 meters of various shapes