CT2X Water Conductivity/Temperature Datalogger

  • Conductivity Measurement Range Choice of conductivity measurement ranges - 0 to 100,000, 0 to 200,000 or 0 - 300,000 microSiemens/cm
  • Built-In Datalogger Non-volatile memory can store 349,000 records
  • Great Flexibility Modbus RTU (RS485) and SDI-12 interface
Product Options


The AquiStar CT2X Conductivity Datalogger is a submersible conductivity / temperature sensor with built in datalogger. The CT2X conductivity datalogger is ideal for use in rugged field applications, as it incorporates a 4-pole epoxy/graphite electrode cell. This technology helps reduce fringe field interference errors, decreases inaccuracy caused by polarization effects and lowers contact resistance problems.

The conductivity data logger can store over 349,000 records of conductivity, temperature, and time data and has a non volatile memory which ensures data is not lost in the case of a power failure.

The CT2X is built from 316 Stainless Steel (or Titanium), Viton and PTFE/FEP with a diameter of just 0.75in or 19mm.

The conductivity dataloggers have low power consumption and needs just two AA batteries to power it which can be replaced by the user. Alternatively an external auxiliary power supply can be used for data intensive or SDI-12 applications.

The CT2X electrical conductivity datalogger has a linear and non-linear temperature compensation feature, however specific linear temperature coefficients can be entered to match the material being sampled. A non-linear natural water mode is available for water without linear temperature coefficients.

The CT2X conductivity logger comes with Aqua4Plus software, allowing the user extensive control, flexible programming and real time monitoring, as well as versatile display options. Data can be easily exported to spreadsheets and databases.

The CT2X logger is available with or without cable. Choices of polyurethane, polythene and PTFE/FEP are available.

Other features:

  • Modbus and SDI-12 protocols are available
  • Measures conductivity, total dissolved solids, salinity and temperature
  • Easy networking with RS485

Manufactured by: INW
Model: CT2X Water Conductivity/Temperature Datalogger

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Salinity ingress
Borehole monitoring
Conductivity studies


Length 12.5” (31.8 cm)
16.0” (40.6 cm) w/ pressure
Diameter 0.75” (1.9 cm)
Weight 1.0lb. (0.5 kg)
Body Material Delrin® & 316 stainless or titanium
Wire Seal Materials Viton® and PTFE/FEP
Submersible Cable Polyurethane, polyethylene, or FEP
Cable Weight 4lbs./100 ft (1.8 kg/30 m)
Protection Rating IP68, NEMA 6P
Desiccant 1-3mm indicating silica gel (high or
standard capacity)
Terminating Connector Available
Communication RS485 Modbus® RTU
SDI-12 (ver.1.3)
Operating Temp. Range3 -15°C to 55° C
Storage Temp. Range1 -40°C to 80° C
Memory 4MB - 349,000 records
Log Types Variable, user-defined, logarithmic, profiled
Programmable Baud Rate 9600, 19200, 38400
Logging Rate 4x/sec maximum
Software Complimentary Aqua4Plus or
Networking 32 available addresses per junction w/ batching capabilities (up to 255)
File Formats .xls / .csv / .a4d
Internal Battery 2x1.5V AA Alkaline2
Auxiliary Power 12VDC - Nominal
6-15VDC - Range
Exp. Alkaline Battery Life 12 months at 15m polling interval7
Element Type 30K ohm thermistor
Element Material Epoxy bead/external housing
Accuracy ± 0.2°C
Resolution 0.1°C
Range -5°C to 60° C
Units Celsius, Fahrenheit, Kelvin
Probe Material Epoxy/Graphite
Electrode 4-pole
Static Accuracy ± 0.5% of measured value
Resolution 32 bit
Ranges Conductivity6:
0-100,000 or 0-200,000 or 0-300,000 µS/cm
4.9-49,000 or 4.9-98,000 or 4.9-147,000 mg/L
2-42 PSU
Units µS/cm, mS/cm, mg/L, PSU
Resolution 0.1 µS/cm / 0.001 mS/cm / 0.1 mg/L (TDS) / 0.001 PSU
Warm-Up Time 200 msec
Thermal Compensation None, linear, or nLFn
1Storage without batteries
2 Lithium available upon request
3Requires freeze protection kit if using pressure option in water below freezing
4Burst reduced at PSI>300
5Higher pressure ratings available upon request
6Accuracy reduced at levels <10 µS/cm
7May vary due to environmental factors


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