Multiparameter probe CTD 90 | Multiparametersonde

The CTD90 is a high quality, high accuracy multiparameter probe for oceanographic and limnological measurements of physical, chemical and optical parameters up to a depth of  2000m. The probe can be equipped with maximum nine sensors mounted on the bottom cap. The numbers of sensors can be extended by connecting external units like fluorometers, currentmeters or other devices via underwater cable connection to the top cap of the CTD90. The system is able to control and operate motor driven water-sampler rosettes (Hydro-Bios). The CTD90 is mainly designed for portable applications where low weight and easy handling is the most important feature of the employment.

The CTD90 allows the simultaneous measurement of following parameters:

  • Pressure (depth)
  • Temperature
  • Conductivity
  • pH
  • Redox
  • dissolved oxygen
  • Light transmission
  • Light scattering (90°)

All sensors are protected by a titanium cage.

Main Features

  • low weight
  • easy handling
  • max. 9 sensors
  • max. 6 external units
  • corrosions free housing
  • depth range up to 6000m
  • control and operation of water samplers and plancton nets
  • data aquisition software running under Windows 95/98/Me/2000/XP
  • calculations according to UNESCO formulas


  • Housing: Titanium
  • Stainless steel
  • Connector: Titanium, Neopren
  • Dimensions and Weights
  • L (housing) 350 mm
  • Ø (housing) 89 mm
  • L (overall) 600 mm
  • W (in air) app. 6 kg

The probe is equipped with a high precision microprocessor controlled 20 bit analog to digital converter and has 16 channels. Data is available as RS 232 Signal (multiconductor cable) and as analog FSK Signal modulated on  constant current (single conductor cable).
The probe can be powered by battery or DC-Power-supply (9 - 18 Volt) when using RS 232 output (3 wire connection for short distance) or by constant current with FSK output (coaxial connection) for longer distance. An interface for constant current supply is available.
A data aquisition program running under Windows 95/98/ NT for display and calculation of the physical values is part of the system . All calculations correspond to the UNESCO formulas.

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