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Paddlewheel flow sensor
A paddlewheel flowmeter (sometimes called an impeller flowmeter or flow paddlewheel sensor) is a simple and robust device often used in aquaculture to measure the water flow in pipes supplying tanks or ponds. Here is a description adapted to the aquaculture context:
Operating principle
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A small paddle wheel (impeller) is placed inside the pipe through which the water flows.
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When water circulates, it makes the wheel rotate proportionally to the flow velocity.
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The rotation speed is converted into an electrical signal (magnetic or optical pulses) sent to a display or controller.
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From this signal, the volumetric flow rate (L/min or m³/h) is calculated.
Paddlewheel Flowmeter
Paddlewheel flow sensor
A paddlewheel flowmeter (sometimes called an impeller flowmeter or flow paddlewheel sensor) is a simple and robust device often used in aquaculture to measure the water flow in pipes supplying tanks or ponds. Here is a description adapted to the aquaculture context:
Operating principle
-
A small paddle wheel (impeller) is placed inside the pipe through which the water flows.
-
When water circulates, it makes the wheel rotate proportionally to the flow velocity.
-
The rotation speed is converted into an electrical signal (magnetic or optical pulses) sent to a display or controller.
-
From this signal, the volumetric flow rate (L/min or m³/h) is calculated.
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General features
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Materials: technical plastics, stainless steel, or composites, resistant to freshwater and sometimes seawater.
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Pipe diameters: typically DN 15 to DN 200 (and larger).
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Measuring range: usually 0.3 to 10 m/s flow velocity.
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Accuracy: ±1 to 2% of full scale depending on the model.
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Output: pulses (Hz), 4–20 mA, or digital communication.
Use in aquaculture
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Monitoring water renewal in ponds or tanks (essential for oxygen supply and waste removal).
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Pump control and anomaly detection (clogging, leakage, pump failure).
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Automatic management: can be coupled with a PLC or oxygen regulation system.
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Durability: less sensitive to water quality compared to more expensive electromagnetic flowmeters.
