Deep Sea


The function of Messenger consists in communicating with the COSTOF in order to record data, then bring them back to the surface and send them via the Argos system.

Part of these data is sent via satellite using the ARGOS system, while another part is to be read on a PC once the float has been retrieved from the water.

The Messengers are released from the seabed stations by a release activated by the electrolysis of an INCONEL wire. The release is activated when the Inconel wire is cut off by the circulation of an electric current between the wire and the housing. The Messenger is then released from its support and starts ascending to the surface.

The float has buoyancy characteristics down to 4000m, which allow it to return to the surface.








SPHT enables to measure and record pH and temperature in deep waters.

SPHT is used with temperature and pH sensors specifically designed for use down to 6000m. These sensors are linked to the  SPHT by a connector.

Set-up and  data transmission can be performed by an inductive data interface (Data Pencil), and  a computer with the Winmemo software.

SPHT can be set-up and data can be read at 6000m with a Data Pencil 6000 used on a submarine, a ROV or an AUV.


The SPOT potentiostat allows the measurement of the current flow that results from the reduction or oxidation of the test compounds present in solution, caused by a controlled variation in the potential difference between two particular electrodes.

The basic units of a voltage analyser are:

A cell based on a system comprising three electrodes immersed in the solution to be analysed.

The three electrodes are:

  • The work electrode,
  • The reference electrode,
  • The auxiliary electrode.

An electronic circuit (called potentiostat) that allows the potential to be modified and the current to be recorded.

By plotting the curve I = f(V), one determines the concentration of the specied to be measured.

The SPOT potentiostat must be associated with a sensor that requires a waterproof voltage measurement (e.g. sulfur sensor).





S2T6000 DH-TI _ D


S2T6000 D

Measurement of the temperature for the study of deep-sea environment. 
Especially for cases where remote measurement is necessary to access to very narrow areas or to protect the data logger against excessive temperature.