CTD-10 Conductivity Temperature & Depth Sensor

The CTD-10 sensor is a low cost, accurate tool for monitoring of water level, electrical conductivity, and temperature in both ground water and surface water.  The sensor utilizes a vented pressure transducer to obtain accurate water level measurements from 0 to 10 m while removing the effects of barometric pressure.  With a range of 0 to 120 dS/m, the CTD sensor has the ability to make accurate electrical conductivity measurements in a broad range of applications.

The CTD sensor is a robust, marine grade sensor, 3.4 cm in diameter. It connects by cable to an external datalogger. Much of the complex circuitry is in the data logger, lowering the cost of individual sensors without impacting their accuracy or resolution.  This makes it so that instead having to rely on a single measurement, you can measure in several different locations without exceeding your budget.

The CTD sensor is compatible with the Em50 series and Campbell Scientific data loggers. The Em50G offers a remote transmission option to deliver data wirelessly to your desktop. With this option, water depth, temperature and electrical conductivity can be monitored from any internet-connected computer in near-real time.

CTD Panels

Range: 0 to 10 m
Conductivity 0 to 120 dS/m (mS/ cm)
Temp -11 to +49ºC
Accuracy: Depth: + 0.05% of full scale @ 20°C
Conductivity+ 0.01 dS/m or + 10% (whichever is greater)
Temp+/- 1ºC
Depth 2mm
Conductivity 0.001 dS/m
Temp 0.1ºC
Operating Temperature:
0 to 50°C (Pressure transducer cannot be allowed to freeze while submersed.)
Power Requirements: 3.6 - 15 VDC, 0.03 mA quiescent, 0.5 mA during 300 ms measurement
Dimensions: Housing: 3.4 cm Diameter, 9 cm length
Output: Serial TTL, 3.6 Volts Levels or SDI-12
Cable Length: 10 m standard; custom lengths available upon request
Measurement Time: 300 ms
Data Logger Compatibility (not exclusive) METER: Em50 series
Campbell Scientific: Any logger with serial I/O including CR10X, CR23X, any CRBasic type logger
Other: Any data acquisition system capable of 3.6 - 15V excitation, and serial or SDI-12 communication
Warranty One year, parts and labour

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Non UK/Ireland Customers

Non UK/Ireland Customers, please contact Decagon Devices at: www.decagon.com

CTD Long


  • Aquifer recharge and recovery
  • Saltwater intrusion, desalination and waste-water
  • Wetland monitoring
  • Groundwater contamination monitoring
  • Surface water monitoring


  • Robust marine-grade epoxy overmold to resist corrosion in tough environments.

  • Compact 3.4 cm diameter sensor body to fit into tight spaces.

  • External logger with remote transmission option to deliver data to your desktop.

  • Permanent connection allows you to collect data continously without pulling up the sensor.

  • Low per-sensor cost.

CTD Quick Start Guide
Size: 1.8 MB (1,874,743 bytes)

Environmental Catalogue
Size: 2.5 MB (2,581,813 bytes)

Quotation Request

Email us to request a quotation for the CTD-10 Conductivity Temperature & Depth Sensor