NOSS: absolute salinity

NOSS sensor is a unique underwater sensor for in situ refractive index measurement and capable to detect salinity anomalies of seawater. It can be used down to 2000 meters.

 Revolutionary approach based on refractometry

In situ refractive index measurement

 Ideal for autonomous platform integration

 Fast sensor configuration and data transfer using serial link

 Optimize and compact design

 Measured in real-time up to 3 Hz

 Not need calibration after deployment

Datasheet

Features and benefits

  • The thermodynamic properties of seawater such as density and enthalpy, are now correctly expressed as functions of Absolute Salinity rather being functions of the conductivity of seawater. Spatial variations of the composition 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.

  • Examples of use

  • Embedding on CTD probes, buoys, gliders, AUV, drifting-profiling floats for operational oceanography
  • Alternative solution to classical CTD
  • Sensors

  • Refractive Index
  • Temperature
  • Absolute Salinity
  • Density
  • Technical data

  • Refractive Index:
    Range 1.3353 to 1.3458
    Initial accuracy < 1.10-6
  • Temperature:
    Range -2 to +35°C
    Initial accuracy +-0.006°C
    Response time(at 63%) < 150msec
  • Operational Depth:
    Range 0 to 2100 dbar
    Initial Accuracy +-1dbar
  • Absolute Salinity:
    Range 15 to 42 g/kg
    Initial accuracy +- 0.003kg/m3
  • Density:
    Range 1020 to 1030 kg/m3
    Initial accuracy +-0.003kg/m3
  • Data output: RS232 Serial Output / Data format ASCII
  • Sampling rate: programmable from 1 Hz to 3Hz
  • Power supply: 6 to 18 Vdc
  • Power consumption: Approxx. 0.065 A at 10.8 Vdc
  • Dimensions: length x diameter: 185.2 mm x 100mm
  • Weight: 2.4kg in air; 1.7kg in water
  • Housing Material: Titanium (with protective guard)
  • Connector: Connector SUBCONN MCDLSF 8-pin
  • Downloads

    NOSS_High-resolution and compact refractometer for salinity measurements_Measurement Science and Technology_2009

    NOSS_Refractometer resolution limits for measuring seawater refractive index_Octobre 2010.

    NOSS_Practical versus absolute salinity measurements, new advances in high performance seawater salinity sensors_Deep Sea Research Part I: Oceanographic Research Papers_January 2010.

    NOSS_article_une solution optique pour la mesure de la salinité absolue des océans