The non-contacting (toroidal) cell uses a magnetic field to sense conductivity. A transmitting coil induces an electric voltage in a liquid. The ions present in the liquid enable a current flow that increases with increasing ion concentration. The ionic concentration is then proportional to the conductivity. The current in the liquid generates a magnetic alternating field in the receiving coil. The resulting current induced in the receiving coil is measured and used to determine the conductivity value of the solution.
Advantages to this type of cell are:
- no polarisation
- reduced maintenance
- increased chemical resistance
- complete galvanic separation of measurement from medium (eliminates ground loss)
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