Water Conductivity Sensor based on Coils to Detect Illegal Dumpings in Smart Cities

Abstract

[EN] The illegal dumpings in sewerage can cause problems in the Wastewater treatment plants. In this paper, we propose a system for detecting these illegal dumpings. We use conductivity sensor for detecting the change in the conductivity of water. Because this change may be due to a dump. The system is based on two coils, a coil is powered by a sinus-wave and induced the other coil. To prevent damaged for water in the copper we encapsulate the coils in a PVC tube. These coils are connected to flyport to send the values and generate alarms. We test with different configurations of coils with encapsulation of 3 and 1 mm. In the different prototypes tested have been seen that with the 3 mm encapsulation no significant differences are observed. The better prototypes are based on 40 spires of the powered coil and 80 spires in the induced coil. The best difference between samples of 0 and 40 g/l of table salt are in the prototype when the spires are distributed in 1 layer (6.06 V). Another prototype test with the same number of turns but distributed in 4 layers has a difference of 4.10 V. But during the verification phase we verified that this last prototype presents a relative error of 2.54% compared to 6.55% of the prototype distributed in a layer