Because of the limited experience with turbidimeters and UV-Vis spectrometers, it is necessary to provide installation recommendations and determinate appropriate data collection frequency, cleaning and maintenance conditions of the sensors. A homogenization system was designed and installed by the authors on samples from four different sewage drainage systems in Bogota. It was found that angle and depth of installation of the sensor have a significant influence on the variability of results, but the main factor is the variability of water quality in each drainage system. Although the proposed methods give indications of operation of the sensors that could provide savings in energy costs required for its operation, it wasn t possible to establish a notorious relation between pollutant concentrations of drainage systems and collection frequency (Ruiz et al., 2011 method) or cleaning (according to two proposed methods: outliers and clusters) recommended, especially for turbidimeters. A warning system method for automatic and manual cleaning is proposed for each drainage system.