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Similarly to turbine meters, the paddle wheel meter requires a minimum run of straight pipe before and after the sensor. Flow displays and controllers are used to receive the signal from the paddle wheel meter and convert it into actual flow rate or total flow values.
Rotating paddle level sensors are a very old and established technique for bulk solid point level indication. The technique uses a low-speed gear motor that rotates a paddle wheel. When the paddle is stalled by solid materials, the motor is rotated on its shaft by its own torque until a flange mounted on the motor contacts a mechanical switch.
A paddle wheel aereator used in an Indonesian shrimp pond. A paddle wheel is a form of waterwheel or impeller in which a number of paddles are set around the periphery of the wheel. It has several uses, of which some are: Very low-lift water pumping, such as flooding paddy fields at no more than about 0.5 m (20 in) height above the water source ...
A compound meter is used where high flow rates are necessary, but where at times there are also smaller rates of flow that need to be accurately measured. Compound meters have two measuring elements and a check valve to regulate flow between them. At high flow rates, water is normally diverted primarily or completely to the high flow element.
Only the upstream depth needs to be measured to calculate the flow rate. A free flow also induces a hydraulic jump downstream of the flume. Submerged flow occurs when the water surface downstream of the flume is high enough to restrict flow through a flume, submerged flume conditions exist. A backwater buildup effect occurs in a submerged flume.
A stream wheel [6] [12] is a vertically mounted water wheel that is rotated by the water in a water course striking paddles or blades at the bottom of the wheel. This type of water wheel is the oldest type of horizontal axis wheel. [citation needed] They are also known as free surface wheels because the water is not constrained by millraces or ...
A rotameter is a device that measures the volumetric flow rate of fluid in a closed tube. [ 1 ] It belongs to a class of meters called variable-area flowmeters , which measure flow rate by allowing the cross-sectional area the fluid travels through to vary, causing a measurable effect.
Generally the water should be replaced about every hour. [3] [4] This means a typical raceway section requires a flow rate around 30 liters per second. [16] However, the optimum flow through rate depends on the species, because there are differences in the rates at which oxygen is consumed and metabolic wastes are produced.
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