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Flume flow sensor8/8/2023 Open channel measuring devices are seen ever day in sewage pipes and particularly in manholes, canals, streams, and rivers. They are especially common in regulating sewage treatment plant influent and effluent, industrial process discharge, and irrigation run-off. Parshall flumes are one of the most widely used flumes for permanent flow monitoring. Special devices such as flumes are required. Most techniques used to measure flow in pipes are not applicable to flow within open channels. Different geometries are used for open channel flow measurement, including flumes that make the channel narrower, weirs that force the liquid over a dam-like obstruction and nozzles that restrict the flow of liquid before it freefalls from the nozzle The electronic flow transmitter uses the signal from the transducer to measure the level and determine liquid flow. A transducer is mounted on or near the primary device to sense the level. When the flow increases, the level rises higher. Under flowing conditions, this restriction causes a rise in liquid level at a location either upstream or within the flowmeter. ![]() The wetted primary device restricts the liquid flow stream. How do Open Channel Meters work ? - Primary Devices or Hydraulic structures (Weirs, Flumes, Nozzles) ![]() Other less common techniques do also exist using time of flight, laser etc. These are known as area velocity flowmeters and measure upwards from the channel floor to calculate velocity and hydrostatic depth together, to compute flow. Alternatively it is possible to install flow and level sensors in the channel or stream itself.
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