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Capteur NOSS

Water quality monitoring : measurement and profile of absolute salinity, refractive index, pressure and temperature

European patent and funded by FUI and Pole Mer Bretagne.

The thermodynamic properes of seawater, such as density and enthalpy, are now correctly expressed as functions of Absolute Salinity rather than being functions of the conductivity of seawater. Spatial variaons of the composion of seawater mean that Absolute Salinity is not simply proportional to Practical Salinity.

NOSS sensor is a unique underwater sensor for in situ refractive index measurement and capable to detect salinity anomalies of seawater. NOSS sensor has been designed for an use even in harsh environments, down to 2000 meters.

Possible use

  • Embedding on CTD probes, buoys, gliders, AUV, driftingprofiling floats for operational oceanography
  • Alternave solution to classical CTD


  • Fast sensor configuration (sampling, resolution) and data transfer using serial link.
  • Optimize and compact design
  • Optimal sensors protection for vibration and pressure resistance (NF X10-812 standard)
  • Measured in real-time up to 3 Hz
  • Not need calibration after deployment



Refractive Index

Range : 1.3353 to 1.3458
intitial accuracy : >1.10-6


Range : -2 +35°C
initial accuracy : ± 0.006°C
Response time (at 63%) : > 150msec

Operational Depth        

Range : 0 to 2100 dbar
Initial accuracy : ±1 dbar

Absolute Salinity
(according to TEOS-10)

Range : 15 to 42 g/kg
Initial accuracy : ±0.005

Data output

RS232 Serail Output
Data format ASCII

Data storage


Sampling rate 

Programmable from 1Hz to 3 Hz

Power supply

Range : 6 to 18 Vdc

Power consumption

Approx. 0.065 A at 10.8 Vdc


170 mm x 100 mm


2.4 kg in air ; 1.7 kg in water

Housing Material

Titanium (with protective guard)


Connector SUBCONN MCDLSF 8-pin


  • NOSS Monitoring
  • Key physical variables in the ocean : temperature, salinity, and density (Nature Education knowledge)

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