Conductivity Sensors Type CT2X Seametrics
Conductivity Sensors Type CT2X Seametrics

Conductivity Sensors Type CT2X Seametrics

CT2X Seametrics

Conductivity, Temperature, Salinity, TDS, Pressure (optional)
  • Measures conductivity, total dissolved solids, and temperature.
  • Integrated datalogger collects up to 349,000 records.
  • Can measure as low as 10 microsiemens/cm and as high as 300,000 microsiemens/cm.
  • Available with Modbus or SDI-12 protocol.
  • Includes new Aqua4Plus software (Modbus® protocol).

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.


The CT2X is a conductivity and temperature sensor with built-in datalogging. Incorporating a 4-pole epoxy and graphite electrode cell, it is extremely durable and resistant to data interferences—making it excellent for use in rugged field conditions.

The CT2X also comes with Seametrics’ powerful, easy-to-use Aqua4Plus software, affording the user extensive control, including real-time monitoring, flexible programming, and versatile data display options.


Conductivity Sensors Type CT2X Seametrics
Conductivity Sensors Type CT2X Seametrics
  • Measures conductivity, total dissolved solids, and temperature.
  • Ranges from 10 microsiemens/cm to 300,000 microsiemens/cm.
  • Pressure and level option available.
  • In-field calibration utilities.
  • Narrow 0.75″ diameter, 12.5″ or 16″ length (depending on version).
  • Linear and nLFn temperature compensation.
  • Up to 349,000 records in non-volatile memory.
  • 316 stainless steel, fluoropolymer, and PTFE construction (titanium optional).
  • Digital industry standard RS485 interface.
  • Available with a variety of cable options—including polyethylene, polyurethane, and FEP Teflon.
  • Modbus and SDI-12 protocols available.
  • Easy export to spreadsheets and databases.

    Conductivity Sensors Type CT2X Seametrics Dimensions
    Conductivity Sensors Type CT2X Seametrics Dimensions


Housing & Cable Weight 1.0 lb. (0.5 kg)
Body Material Acetal & 316 stainless or titanium
Wire Seal Material Fluoropolymer and PTFE
Cable Submersible: polyurethane, polyethylene, or ETFE (4 lb./100 ft., 1.8 kg/30 m)
Desiccant 1-3 mm indicating silica gel
Field Connector Standard
Temperature Operating Range Recommended: -5˚ to 40˚C (23˚ to 104˚F) Requires freeze protection kit if using pressure option in water below freezing.
Storage Range Without batteries: -40˚ to 80˚C (-40˚ to 176˚F)
Power Internal Battery Two replaceable lithium ‘AA’ batteries – Battery life: 12 months at 15 min. polling interval (may vary do to environmental factors)
Auxiliary 12 Vdc – Nominal, 9-15 Vdc – range
Communication RS485 Modbus® RTU (output = 32-bit IEEE floating point), SDI-12 (ver. 1.3) – ASCII
Logging Memory 4MB – 349,000 records
Logging Types Variable, user-defined, profiled
Logging Rates 4x/sec maximum, no minimum
Baud Rates 9600, 19200, 38400
Software Complimentary Aqua4Plus 2.0
Networking 32 available addresses per junction (Address range: 1 to 255)
File Formats .a4d and .csv
Output Channels Temperature Depth/Level Conductivity
Element 30K ohm thermistor, Epoxy bead/external housing, Pyrex® glass Silicon strain gauge transducer 316 stainless or Hastelloy Epoxy/Graphite – 4-pole
Accuracy ±0.25˚C ±0.05% FSO (typical, static)
±0.1% FSO (maximum, static)
(B.F.S.L. 20˚C)
Static: ±0.5% of measured value (0 – 100,000 μS/cm)
Resolution 0.1˚C 0.0034% FS (typical) (32 bit internal) 0.1 μS/cm, 0.001 mS/cm, 0.1 mg/L (TDS), 0.001 PSU
Units Celsius, Fahrenheit, Kelvin PSI, FtH₂O, inH₂O, mmH₂O, mH₂O, inH₂O, cmHg, mmHg, Bars, Bars, kPa μS/cm, mS/cm, mg/L, PSU
Range -5˚ to 40˚C (23˚ to 104˚F) Gauge : PSI: 12,5,7,15,30,50,100,300 FtH₂O : 2.32,12,35,69,115,231,692 mH₂O : 0.72,3.5,5,10.5,21,35,70,210

Absolute3 : PSI: 30, 50, 100, 300
FtH₂O : 35, 81, 196, 658
mH₂O : 10, 24, 59, 200

Conductivity1 : 0 300,000 μS/cm
TDS : 4.9-147,000 mg/L
Salinity : 2-42 PSU
Compensated 0˚ to 40˚C (32˚ to 104˚F) Thermal: None, Linear, or nLFn
Compensated  — 200 msec
Max operating pressure 1.1 x full scale
Over pressure protection 3x full scale up to 300psi
Burst pressure 1000 psi (approx. 2000 ft or 600 m)
Environmental IP68, NEMA 6P

Read more : Pressure And Level Sensors Type LevelSCOUT Seametrics; Pressure And Level Sensors Type PT12-BV SeametricsPressure And Level Sensors Type BaroSCOUT Seametrics


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