NOSS: DENSITY AND ABSOLUTE SALINITY

NOSS: density and absolute salinity

Description - The thermodynamic properties 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 variations of the composition of seawater mean that Absolute Salinity is not simply proportional to Practical Salinity.

NOSS sensor, for NKE Optical Salinity 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. It becomes a pioneer for initiating experimental studies on the refractive index/density of seawater with anomalous composition. It has been designed to be integrated on surface buoys, sea bottom observatories and profiling Provor floats (down to 2000m) and it takes advantage of its little size and low power energy.

NOSS: density and 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

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