A new field-effect transistor based transducer concept is presented, for measuring both, liquid and gaseous media. It uses a Faraday cup with a floating electrode inside, which is connected to the gate of a MOS like transistor. The SOI based technological realization allows a new degree of freedom for more flexible measurements as compared to conventional FET based transducers. Potentiometric measurements are presented. Additionally the SOI technology allows simple packaging
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