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ES-5 Series Toroidal Conductivity Sensors from Aquametrix

USA Toll Free: 1-800-730-0302 Tel: 416-240-1920 -

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

ES-5 Series Data Sheet
ES-5 Series Manual



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Metex Corporation Limited has been providing superior products and services to the process control, chemical treatment, waste water, industrial and manufacturing industries for over 25 years. It is our goal to continually provide our customers with the best possible equipment, technology, and service.


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