![]() The number of pulses over a given time indicates the volume of fluid that has passed through the meter. Flow rate calculation: An electronic circuit or processing unit interprets the frequency of the generated electrical signals to calculate the flow rate.Each pulse or signal corresponds to a partial rotation of the wheel. Signal generation: The sensor's role is to convert the mechanical action of the paddle wheel into an electrical signal.Optical sensors, conversely, detect the interruption of a light beam or the reflection from the paddles. The paddles contain magnets for magnetic sensors that generate a pulse each time they pass by the sensor. Sensing mechanism: Close to the paddle wheel is a magnetic or optical sensor.A faster flow rate results in a higher rotational speed of the paddle wheel and vice versa. Proportional rotation: The speed at which the paddle wheel spins is directly proportional to the velocity of the flowing fluid.The force of the fluid's movement against the paddle blades imparts rotational energy to the wheel. Fluid interaction: The flowing medium directly engages with the wheel's paddles.As fluid passes through the meter, the following sequence occurs: The paddle wheel, or rotor, is positioned within the flow stream. Paddle wheel flow meter working principle Shaft and bearings (D): The paddle wheel is typically mounted on a shaft, supported by bearings that allow smooth rotation with minimal friction and wear.Learn more from our chemical resistance guide. This body must be made of materials compatible with the fluid to prevent corrosion and ensure durability. Housing (C): The paddle wheel and sensor are housed within a robust body that can be inserted into the pipeline.As the paddles pass by the sensor, it registers each rotation, which is proportional to the flow rate. ![]()
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