Accurate, reliable sensors for mobile marine platforms






Contact NBOSI for more information, 3D CAD models or a quote
Contact NBOSI


Beginning in the late 1950's Neil Brown developed methods to determine ocean salinity in real-time using measured seawater conductivity and temperature. This work eventually resulted in the first modern conductivity-temperature-depth (CTD) sensor.

The NBOSI approach to measuring salinity is an evolution of Neil Brown's 2002 patent (US 6,720,773) for an internal field, four-electrode conductivity cell with an integral pressure-protected thermistor and a self-referencing electronics. Optimized for use on mobile platforms, the NBOSI cell is free-flushing, fast-responding, quiet, vibration-free, rugged, low-power and insensitive to mounting location.

Unlike existing two-electrode cells, the NBOSI CT Sensor does not require an energy-consuming and noisy pump. And unlike inductive cells, the compact, rugged, and low-drag NBOSI sensor may be mounted anywhere on the vehicle exterior without compromising data quality or sacrificing hydrodynamic efficiency.

A simple RS-232 data interface facilitates vehicle integration and provides raw or engineering-unit data at up to 10Hz.

All sensors are fully potted and capable of operation beyond 6000 dbar. We regularly perform in-house pressure validation testing to 9,800 psi (6750 dbar) for customers operating under extreme conditions.

Our integrated CTD incorporates a precision pressure sensor (Keller 7LD) enabling real-time output of depth, sound speed and ocean density along with temperature, conductivity and salinity.

All products are assembled and calibrated in our Massachusetts, USA facility.



Dave Fratantoni


Ray Schmitt

Co-Founder, President

bob petitt

Co-Founder, Chief Engineer

Neil Brown


satisfied customers

Since 2004 NBOSI has delivered nearly 1000 sensor systems to leaders in ocean research, industry and defense

Contact NBOSI for more information, 3D CAD models or a quote


82 Technology Park Drive
East Falmouth, MA  02536


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