Abstract
This chapter discusses the basics of electrochemical sensing and sensors. As is the case with physical sensors in the electrical domain, the retrieved information can be represented by a voltage, a current, or an impedance. For chemical sensors based on electrochemical measuring principles, this subdivision turns out to be a fundamental one because different means of mass transport are involved. Information represented by a voltage, a current or an impedance is retrieved by potentiometric sensors, by amperometric sensors or by electrolyte conductivity sensors, respectively. This chapter describes some fundamentals of potentiometry, amperometry, and electrolyte conductivity.
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