Open channel flow sensors measure fluid flow through open channels. Open channel flow measurement is difficult because of non-uniform channel dimensions and variations in velocities across the channel. Some open channel flow sensors measure the displacement of a vane or piston that is pushed by the fluid. A non-contacting open flow sensor avoids flow disturbances and fouling. Doppler flow meters transmit acoustic waves into the flow and use the frequency shifts of reflected waves to determine the flow velocity. Ultrasonic open channel flow sensors mount a non-contacting sensor above the flume or weir through which fluid passes. An ultrasonic flow sensor transmits an ultrasonic pulse and measures the time elapsed when an echo is received. In this way, ultrasonic flow sensors can measure the water level or "head" accurately. An open channel flow monitor can continuously monitor, display, totalize and log flow information.
Specifications for open channel flow sensors include monitoring type (continuous or totalized), viscosity and fluid purity. An open channel flow sensor can display information at the meter, or transmit it electronically to a remote location. Additional specifications to consider are minimum and maximum flow rate for open channel flow meters, the ability to measure flow under ice, and the chemical compatibility of wetted parts. When measuring the flow of compressible fluids, open channel flow sensors must be able to handle variation in volumetric flow data unless density (and sometimes also viscosity) is constant. When the velocity (volumetric flow) of incompressible liquids is measured, the presence of suspended bubbles will cause error; therefore, air and gas must be removed before the fluid reaches the meter.
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Ultrasonic Flow Meters, Clamp on Flow meters - Level Sensors -... Open Channel Area Velocity Flow Meters |
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Open Channel Flow Sensors Information | Business.com Open Channel Flow Sensors Manufacturers, distributors, and sellers of open channel flow sensors. See Business.com, Inc. Information |
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