Learn about Open Channel Measuring Principles.

Open Channel Flow Meters

Alsonic Family		Liquids	Transducer Styles			Temperature	Approvals
Technology	Model	Limitations	Clamp-On	Inline	Insertion	Range	General	Ex Proof
Transit Time DSP	ALSONIC-AVM	< 30% particles or bubbles	Not Available	Not Available		-40 to +120?	CE Pending	Not Available

Smart Measurement’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, which consists of an advanced DSP-based flow computer and four transducers, 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. Our unique TT technologies will enable accurate measurement even at less than idea flow profiles. The ALSONIC-AVM also comes with an optional Laser Pointer Alignment tool (Patented) for alignment of each pair of transducers.