CF-SPEED 20 - medidor de velocidade de escoamento em canais por diferencial de pressão

Abstract

The river basins developments are very important for the water cycle, the entry of water is through precipitation, while the exit occurs through runoff and evapotranspiration. This flow can be monitored by means of probabilistic calculations and precision algorithms. In streams and rivers, flow monitoring is carried out by various methods and techniques, such as hydrometric windlass, gutters, acoustic doppler or even methods with floats. Today with the new technologies, the importance of technological innovation has become something important, thinking about it, the present work aims to develop a device for measuring flow velocity in channels by means of pressure, called CF-SPEED 20. The meter it was developed at Universidade Brasil - Campus Fernandópolis and consists of sensors (pressure), digital amplifier modules (HX711) and memory card, connected to the Arduino platform. The structure where the sensors and electronic circuits are located was built using low cost material and the plastic base. To provide greater balance and accuracy during measurement, a bubble level T-shape was installed on the upper part of the structure. In five tests performed by the CF-SPEED 20, flow velocity data was collected and stored in a given stretch of the stream, allowing calculate the amount of water passing through that location. The calibration of the CF-SPEED 20 was performed by regression, with one variable being the flow rate measured by the hydrometric reel and the variable with the voltage difference measured in the pressure sensors. The results obtained from the calibration of the sensors and the application of the meter, show an excellent reliability in obtaining data of the flow velocity. It can be concluded that the CF-SPEED 20 meter is functional to capture the flow velocity using the differential pressure and at a low cost.