NexSens CB-1250 Data Buoy

The NexSens CB-1250 Data Buoy is designed for deployment in lakes, rivers, coastal waters, harbors, estuaries and other freshwater or marine environments.


  • Integrated 71-watt solar panels for 213-watts of solar charging
  • Three 8" diameter sensor holes with female NPT threads for sensor deployment
  • Topside plate supports solar marine light, weather stations, and other sensors
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NexSens CB-1250 Data Buoy

The NexSens CB-1250 Data Buoy is designed for deployment in lakes, rivers, coastal waters, harbors, estuaries and other freshwater or marine environments. The floating platform supports both topside and subsurface environmental monitoring sensors including weather stations, wave sensors, thermistor strings, multi-parameter sondes, Doppler current profilers and other monitoring instruments.

The buoy is constructed of an inner core of cross-linked polyethylene foam with a tough polyurea skin. A topside 46” tall stainless steel tower includes three 71-watt 12VDC semi-flexible solar panels, and a center 10” ID x 27.5” tall data well accommodates batteries, data loggers, sensors, and more. Three 8” pass-through holes with female NPT bottom threads allow for quick connection of instrument deployment pipes and custom sensor mounts. The stainless steel frame supports both single point and multi-point moorings.

The CB-1250 Data Buoy is optimized for use with NexSens X3 data loggers. Wireless telemetry options include global 4G LTE cellular, Iridium satellite, and global 4G LTE cellular with Iridium satellite fallback. Compatible digital sensor interfaces include RS-232, RS-485 and SDI-12. Each sensor port offers a UW receptacle connector with double O-ring seal for a reliable waterproof connection. For custom integrations, CB-PTL pass through and CB-MCL wet-mate data well lids are available.

  • Hull Outer Diameter: 48.0” (121.9cm)
  • Hull Height: 28.0” (71.1cm)
  • Data Well Inner Diameter: 10.3” (26.2cm)
  • Data Well Height: 27.5" (69.9cm)
  • Pass-Through Hole Diameter: 8.0" (20.3cm)
  • Tower Height: 46.0” (116.8cm)
  • Solar Panels: 3x 71-watts
  • Weight: 300 lb (136kg)
  • Gross Buoyancy: 1250 lb (567kg)
  • Hull Material: Cross-linked polyethylene foam with polyurea coating & stainless steel deck
  • Hardware Material: 316 stainless steel
  • Mooring Attachments: 3x 3/4” eyenuts
  • (1) CB-1250 solar tower
  • (1) CB-1250 buoy hull
  • (1) CB-CCA anti-rotation cage clamp
  • (1) CAGE-L instrument cage
Questions & Answers
What parameters can be measured with CB-1250 data buoys?
NexSens data buoys are designed to simplify the connection of a wide variety of measurement sensors for weather, water quality, water current, waves and solar radiation. When combined with NexSens data loggers, these buoy-based sensors display measurement results online that are accessible to project staff and collaborators. Weather station parameters include air temperature, relative humidity, barometric pressure, wind speed, wind direction and more. Some advanced weather stations also incorporate GPS, tilt, accelerometer & compass sensors. Terrestrial and Underwater PAR sensors measure photosynthetic active radiation. Water quality sondes measure temperature, conductivity, depth, dissolved oxygen, pH, ORP, total algae (phycocyanin and chlorophyll), turbidity, and fluorescent dissolved organic matter (fDOM). The sondes also output several calculated parameters like salinity, specific conductance, total dissolved solids (TDS) and total suspended solids (TSS). Water current sensors used with data buoys are typically multi-beam acoustic doppler based and and measure currents, turbulence, wave height and wave direction. Wave data (height, period, direction) can also be measured using inertial-based sensors mounted on the buoy hull.
How are weather sensors mounted to the CB-1250?
Nexsens offers custom mounts for most industry met sensors including Airmar, Lufft, Vaisala, Gill and YOUNG. Sensor extensions are available based on the height of the sensor in relation to the water's surface. It is necessary to integrate a compass with any buoy-based met sensor to correct for wind direction due to buoy movement.
How do I calculate a power budget for the data buoy?
NexSens has a power budget algorithm to input variables like telemetry methods, measurement frequency, transmission frequency, instruments connected, months deployed, and location for any factory integrated system. With those variables, it is quickly determined whether a given buoy platform will have sufficient solar charging and battery reserve for autonomous deployment.
Can the solar panels be individually replaced in the field?
The solar panels feature a waterproof 2-pin connector that plugs into a 3-way splitter on the solar tower. In the event of a failure, the solar panel can be swapped out in the field.
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