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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.

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)
Flow Rate 4½ digit
Accuracy ±2.0% of reading
Repeatability ±1.0% of reading
Keypad 16 Key with tactile action
Engineering Units m³, Liter, US Gallon, Imperial Gallon, Millon Gallon, Cubic Feet, US Barrels, Imperial Barrels, Oil Barrel
Turn down ratio 1000:1
Response Time Less than one second
Outputs 4-20 mADC, relay, RS-232C
Velocity Range ±0.03~40 feet/sec (±0.01~12m/s)
Totalizer 10-digit, Positive, Negative & Net values
Resolution 0.003 feet/sec (0.001 m/s)
Input 4-20 mADC
Ambient temperature -4~140°F (-20~60°C)
Data logger 32 Mbytes; up to 200,000 fields
Max Cable Length 650' (200m)
Dimensions See data sheet
Power Consumption Less than 20 W
Weight See data sheet
Data storage EPROM storage up to 10 years
Enclosure Mounting Wall mount
Alarm Two relays for total/hi flow
Transducer Materials Stainless steel #316 (housing & sphere)Polycarbonate (lens)
Power Supply 90~250 VAC, 50/60 Hz
Communication RS-232
Protection (converter) NEMA 4 (IP 65)
Protection (transducers) NEMA 6P (IP68) - Submersible
Related Files:
  • Color graphic LCD display 128x64 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

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10437 Innovation Drive, Suite 315, Wauwatosa, WI 53226
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