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Conductivity, inductive

An inductive conductivity cell consists of two coils: a transmitter coil and a receiver coil.

The coils are integrated in a finger-shaped housing. A bore is routed through the finger and the coil integrated into it. The fluid encloses the finger and is also in the bore. A sinusoidal AC voltage is applied to the transmitter coil. This produces a current in the fluid, proportional to the conductivity. This current in turn generates a voltage in the receiver coil. By measuring this voltage and knowing the cell constant, it is possible to determine the conductivity. A temperature sensor is integrated for temperature compensation.

Measuring principle inductive conducitvity