How is an area velocity flowmeter (AVM) different from other flowmeters and where would I use one?
First, an area velocity flowmeter is one of the few flowmeters that will measure flow in a partially filled pipe or channel. This is perfect for gravity flow systems with possible solids in the water. The AVM can be easily installed in the pipe at a manhole or even at the final discharge point. The AVM works by measuring two parameters: velocity and water depth in the pipe. The combination of these two measurements along with the pipe ID results in a fairly accurate flow measurement. The Greyline AVFM is unique in that an ultrasonic sensor rather than a pressure sensor does the level measurement. It is the pressure-sensing device that has plagued many of the earlier AVM’s offered by other manufacturers.
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