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CONDUCTIVITY SENSORS0 pages
CONDUCTIVITY SENSORS
CONDUCTIVITY SENSORS
Despite its simplicity, the measurement of electrical conductivity in liquid substances is a very powerful analytical and diagnostic tool in a variety of applications. The modern, thin-lm conductivity sensor
element is a viable alternative to the classical, bulky conductivity sensors of the past.
THEORETICAL BACKGROUND
Conductivity [μS/cm]
Conductivity [mS/cm] at 25 °C
An electrolyte is a liquid containing ions. Under a voltage, ions act as charge carriers and a current ows.
Therefore, quality of the liquid can be assessed by determining the conductivity. The conductivity of the
liquid depends on two temperature-dependent parameters: ion concentration and their mobility. For
improved accuracy a temperature sensor is placed directly at the point of measurement.
Temperature [°C]
Concentration [%]
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