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Observator 100 years

Seametrics CT2X Conductivity and Temperature Sensor

The Seametrics CT2X Smart Sensor is a microprocessor-based submersible conductivity/temperature sensor with built-in data logging. This device stores thousands of records of conductivity, temperature, salinity, and total dissolved solids (TDS). The CT2X is also available with a depth/level option giving added functionality in the same sensor housing.

The CT2X incorporates 4-pole electrode cell measurement technology for conductivity, salinity, and TDS. This technology reduces fringe field interference errors, lessens inaccuracy caused by polarization effects, and lowers contact resistance problems. Four-pole electrode technology also allows users to work with one electrode over a wide range of conductivity. The conductivity element is constructed of epoxy/graphite, making it extremely durable for use in rugged field conditions. To clean, simply scrub with a small brush.

Depth and level is measured with an extremely rugged and stable piezo-electric, media isolated pressure element and compensated for temperature using our proprietary calibration methodology. Temperature is measured using an epoxy bead thermistor.

The CT2X is powered internally with two replaceable AA batteries. Alternately it can be powered with an external auxiliary power supply for data intensive applications. Several CT2Xs, or a combination of CT2Xs and other Smart Sensors, can be networked together and controlled directly from a single computer.

While most will use the CT2X with our free, easy-to-use Seametrics Aqua4Plus 2.0 software, it is by no means limited to that software. You can use your own Modbus® RTU or SDI-12 software or logging equipment to read measurements, thus tying into your existing telemetry and control systems.


  • Measures/Records conductivity, temperature, salinity, and TDS with a depth/level option
  • Low power
  • Modbus® RTU (RS485) and SDI-12
  • 0-300,000 μS/cm
  • Linear and nLFn temperature compensation
  • Small diameter — 0.75” (1.9 cm)
  • 349,000 records in non-volatile memory
  • Free, easy-to-use, new upgraded Aqua4Plus 2.0 software



  • Wetland surveys
  • Saltwater intrusion monitoring
  • Agricultural runoff studies
  • Discharge monitoring

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