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Our goal is to provide a variety of choices for any flow measurement application at industry leading prices.

Area Velocity Open Channel Ultrasonic Meter


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.

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  • Color graphic LCD display 128×64 for flow rate, total flow & signal shape
  • 32 Mbyte datalogger; up to 200,000 data fields
  • No-moving-parts design creates no pressure loss
  • Velocities from 0.03 ~ 40 feet/sec (0.01 ~ ± 12 m/s)
  • Any liquids containing ≤ 30% suspended solids, including waste water
  • High open-channel accuracy; ±2.0% of reading
  • Oscilloscope function for diagnostics
  • AR (Anti-Round) Mode (patent pending)
  • Fine Time Measurement Technology (Patented)
  • Data logger function; includes date, totalizer, diagnostics
  • Response time less than 1 second
Measuring Principle:Ultrasonic transit-time differential, 4-path
Max pass length:2.46’ (750 mm)
Min pass length:46’ (14m)
Channel Geometrics:RectangularCircularTrapezoidalOther (Consult SMC factory)
Velocity Range:±0.03~40 feet/sec (±0.01~12m/s)
Accuracy:±2.0% of reading
Flow Rate:4½ digit
Repeatability:±1.0% of reading
Engineering Units:m³, Liter, US Gallon, Imperial Gallon, Millon Gallon, Cubic Feet, US Barrels, Imperial Barrels, Oil Barrel
Totalizer:10-digit, Positive, Negative & Net values
Turn down ratio:1000:1
Response Time:Less than one second
Keypad:16 Key with tactile action
Ambient temperature:-4~140°F (-20~60°C)
Resolution:0.003 feet/sec (0.001 m/s)
Data logger:32 Mbytes; up to 200,000 fields
Weight:See data sheet
Power Supply:90~250 VAC, 50/60 Hz
Outputs:4-20 mADC, relay, RS-232C
Input:4-20 mADC
Max Cable Length:650′ (200m)
Alarm:Two relays for total/hi flow
Data storage:EPROM storage up to 10 years
Power Consumption:Less than 20 W
Dimensions:See data sheet
Enclosure Mounting:Wall mount
Transducer Materials:Stainless steel #316 (housing & sphere)Polycarbonate (lens)
Protection (converter):NEMA 4 (IP 65)
Protection (transducers):NEMA 6P (IP68) – Submersible

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