Cristhian Román Herrera, David Loza Matovelle, José Luis Segura, Reza Dabirian
Un dispositivo para medir turbidez fue desarrollado incorporando componentes de bajo costo y tecnología abierta, como Arduino, impresoras 3D y software libre. El dispositivo consta de un LED que emite luz y un sensor que recepta la luz que atraviesa el líquido por medir. Se cuantifica la cantidad de luz que se recepta para obtener una medida. Se analizaron diferentes alternativas y se seleccionó un sistema con dos receptores dispuestos a 90º para obtener los resultados requeridos. Para su calibración se realizaron diferentes pruebas y se obtuvo un rango efectivo entre 50 NTU hasta 650 unidades nefelométricas de turbidez (NTU). Para validar el equipo se comparo con un turbidímetro comercial modelo HACH 2100Q obteniendo resultados con un error 3.3%. La aplicabilidad de este equipo va dirigida al control de la eficiencia de remoción de sólidos suspendidos en plantas de tratamiento de aguas servidas en regiones rurales del Ecuador.
A novel device for measuring turbidity was designed and built. The device was prepared using low cost components and open source technology such as Arduinos, 3-D printers and open source software. The device consists of two main parts; firstly a LED which emits light and secondly a system that measures the light that passes through the sample holder. The amount of light is quantified to obtain a value of the turbidity of the sample. A detector setup with two light receptors aligned at 90º with respect to each other was chosen in order to increase the sensitivity of the instrument. The device was calibrated and showed a sensitivity range between 50 and 650 Nephelometric Turbidity Unit (NTU). As part of the system validation test samples of the device were compared with those of a commercial HACH turbidity sensor and the disparity was just 3.3%. The device is intended to be used to monitor the efficiency of removal of suspended particles in soils as well as treatment of wastewater in rural regions of Ecuador.
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