Chemtrol Australia Product - Toroidal Conductivity Sensor
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Toroidal Conductivity Sensor

Toroidal Conductivity Sensor

This sensor uses two donut-shaped transformers encased in a plastic body with a hold in the middle so that fluids flow through the center of both transformers and surrounds their sealed housing outside path.

  • No polarization & resists fouling because no electrodes contact the stream

  • Highest linear range, works better as conductivity rises

  • Lowest maintenance because it is hardly affected by thin non-conductive coatings including oil


  • Max. pressure / Temp. Rating: 200 PSIG at 105ºC
  • Wetted Materials: Block Copolymer Polypropylene
  • Connection: Process – 3/4″ MNPT, Electrical – 5 meter cable, stripped and tinned

Application Notes

The drive transformer has an AC voltage applied to its windings that includes an electric current flow in the conductive liquid inside the donut hole, that flow path being completed in the liquid surrounding the sensor tip. This external completion path is why the sensor is sensitive to its surroundings in process.

The current flow in the fluid through the center of both transformers cores induces a current in the sense transformer that varies directly in proportion to changes in the fluid conductivity. That current is detected and displayed as solution conductivity.