Public Lab do great things to not only explain ‘citizen science’ initiatives and needs but to make them affordable too – this CT sensor housed in PVC by user bhickman is definitely one such project. Conductivity calibration and a further explaining of the build can be found here.
The goal of this project was to make a conductivity and temperature (CT) sensor that gives accurate and repeatable measurements while still being affordable. In the quest for that goal, a simple circuit board and probe were designed. The design applies an AC square wave across a voltage divider, where one of the resistors is a know value and the second is determined by the resistance of the solution being measured.
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