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) |
| 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 |
| Communication: | RS-232 |
| 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 |
Malaysia
