The CTD-Diver is a fully stand-alone datalogger with built-in memory, battery and sensors. Its ceramic casing and unparalleled conductivity measuring range (0-120 mS) make it suitable for use at every site.

The CTD-Diver is impervious to the most aggressive substances found in water. Its ceramic casing resists when even the strongest metals yield.



Advantages of the CTD-Diver

  • Simultaneously measures water level, temperature and electrical conductivity
  • Large measurement frequency range: 1 sec - 99 hr
  • Small size (ø18-22 mm x 135 mm)
  • Ceramic housing and ceramic sensor
  • Extremely long battery lifetime (8-10 years)
  • Logger and battery in one hermetically sealed housing
  • Possibility of installation without the optional data cable, thus:
    • cheaper installation
    • much easier installation in small diameter wells
    • virtually damage proof

To install the Cera-Diver in a monitoring well you will only need the Cera-Diver and a 1 mm diameter stainless steel cable. Obviously, the Cera-Diver may also be installed using a data cable!


Professional Applications

  • Monitoring saltwater intrusion
  • Water quality monitoring for:
    • Agriculture
    • Remediation
    • Correlate conducitivity with salt, TDS, permanganate, nitrate, sulphate
  • Tidal fluctuations monitoring
  • Estuary and wetlands monitoring
  • Leachate monitoring at landfill sites
  • Aquifer storage and recovery
  • Monitoring network automation
  • Groundwater monitoring projects

Detailed Information


Programming the CTD-Diver takes only a few minutes on your computer in the field or at the office. You can enter location, instrument code, start date and time, sample rate, sample method, and select conductivity range. If you select an event based sample method measured values are stored only if specified changed in conductivity occur. The CTD-Diver can start measuring at any time you specify.


The CTD-Diver has three sensors: a pressure sensor to determine water level, a temperature sensor and a four-electrode sensor to determine conductivity. The internal memory can store up to 48 000 measurements per parameter. For each measurement, the date, time, water level, temperature and conductivity are stored.



Data may be recovered using

    1. an optical Reading Unit or
    2. with the use of a Diver Data Cable (DDC) and a PocketPC or laptop.

With the second method, you can readout the CTD-Diver without removing it from the monitoring well. Data can be retrieved from several CTD-Diver units, after which the files are transferred to a computer.

The CTD-Diver is supplied with the Diver-Office software package. Diver-Office is easy to use and offers additional features such as a barometer wizard to compensate water level measurements for changes in air pressure. It also includes a calibration wizard for quick and easy conductivity sensor calibration. The readout data is stored on your computer and can be exported in various formats to a spreadsheet program or database.


The CTD-Diver i s available in three models with different pressure measuring ranges (10, 50 and 100 m water column). All models have a conductivity measuring range of 0–120 mS/cm and a ceramic casing which is practically damage- and corrosion-proof.

The installed CTD-Diver cannot be seen above ground level, which keeps the risk of vandalism to a minimum. Unlike many other systems, the CTD-Diver does not need a vented cable leading to the surface. The system is entirely closed and moisture penetration is impossible.

Depending on the use, the battery will last for approximately 10 years. All you have to do after readout is rinse and calibrate the conductivity sensor. This is easily done using the Diver-Office software and standard calibration solution.

The CTD-Diver can be reinstalled in the monitoring well and resumes its work. A BaroDiver datalogger should be used simultaneously to measure variations in air pressure so that this can be compensated for when analysing