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    AquaMetrix products have been manufactured for more than five decades. The company has grown into a worldwide maker of water quality instrumentation that is known for working in environments where nothing else works. Aquametrix products have been made in the United States since 2010.                          

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ES-5 Series Toroidal Conductivity Sensors

ES-5 Series Toroidal Conductivity Sensors


The AquaMetrix ES-5 series toroidal conductivity sensors are used in processes where conventional contacting sensors may become fouled or corroded. These probes are unique in the marketplace. They are loop-powered and provide direct 4-20 mA output.

Each sensor comes standard with a Pt100 RTD temperature device, which provides automatic temperature compensation to 25°C (77°F).
The AquaMetrix ES-5 sensors are equipped with 1.5” MNPT threads on both ends so that they can be mounted for in-flow applications or submersion mounted in tanks or open vessels.

Operating Principle
Toroidal conductivity sensors are made up of two-wire wound toroids encapsulated in a potting compound and encased in a plastic body. One toroid acts as a transmitter and the other as a receiver. An electric current is induced between the toroids through the process solution. This current is directly proportional to the conductivity of the process solution.



  • Loop powered 4-20 mA output
  • Low Maintenance – Reduced cleaning requirements
  • No electrode corrosion – Toroid is fully encapsulated
  • One Wetted Material – Easier chemical compatibility
  • Choice of three Measuring range, 0 – 10 mS/cm, 0 – 100 mS/cm, 0 – 1,000 mS/cm.
  • Automatic temperature compensation


  • Plating
  • High purity water applications
  • Pharmaceutical Applications
  • Reverse Osmosis systems
  • Fume Scrubbers
  • Boilers
  • Cooling Towers
  • Textile Manufacturing
  • Food and Beverage


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