CB-40 Data Buoy

CB-40 Data Buoy

The CB-40 offers a compact and affordable platform for deploying water quality sondes and other instruments that integrate power and data logging.





With an overall 14-inch diameter by 48-inch height, the CB-40 can be deployed quickly and easily from a small boat. Fully configured systems typically weigh around 45 lbs.

Topside Plate

Topside Plate

A stainless steel topside plate supports solar marine lights and offers a convenient lifting point via (3) eyenuts.

Buoy deployment pipe

Center Hole

The center hole offers instrument access and includes space for additional instrumentation, battery packs, or other waterproof electronics.

YSI EXO Sonde buoy

Multi-Vendor Compatibility

Compatible instruments include YSI 6-Series & EXO sondes, Hydrolab Series 5 & HL sondes, Eureka Manta sondes, and In-Situ Aqua TROLL instruments.

Instrument Pipe

Instrument Pipe

A 4-inch stainless steel instrument pipe securely houses the sonde or water quality instrument and includes slotted holes for water flow.

Data buoy navigation beacon

Solar Beacon

The optional solar marine light has a one to three nautical mile range and securely mounts to the buoy top plate for maximum visibility.

Built to Last

Built to Last

Constructed of cross-linked polyethylene foam with a heavy polymer skin and an indestructible stainless steel frame, the CB-40 is designed for years of service.

Tech Specs

  • Hull Outer Diameter: 14.0” (35.6cm)
  • Hull Height: 20.0” (50.8cm)
  • Instrument Pipe Inner Diameter: 3.9” (9.83cm)
  • Instrument Pipe Height: 48.0" (121.9cm)
  • Weight: 38 lb (17kg)
  • Net Buoyancy: 40 lb (18kg)
  • Hull Material: Cross-linked polyethylene foam with polyurea coating & stainless steel deck
  • Hardware Material: 304 stainless steel
  • Mooring Attachments: 3x 5/8” eyenuts


What is the most common mooring strategy for the CB-40?
Generally, no more than one point moorings are necessary due to the structure of the deployment pipe. Tangling is not a factor as instruments are enclosed in the pipe and do not hang freely below the CB-40. And, since cages are not a possible added feature to the CB-40, one anchor line is sufficient unless conditions are unusually rough.
Does the buoy require more maintenance in a wastewater lagoon?
Buoy maintenance depends solely on the surrounding conditions. Water quality measurements could read inaccurately if the instrument pipe becomes clogged or covered with debris. High biological fouling will call for more frequent cleanings, typically in wastewater lagoons or bays with zebra mussels and barnacles present. We suggest to visit the buoy once a week or once a month at first, depending on local conditions, and assessing how often cleanings are necessary.
Where is the power supply on the CB-40 buoy?
The CB-40 buoy is not designed for solar power or auxiliary battery packs. The compact, four inch diameter instrument tube holds any small sensors, some of which include integrated batteries and data logging capability. No real-time data telemetry is available for the CB-40 buoy due to the small size. Planning trips to the buoy will depend on maintenance demand and battery and data storage capability.

Case Studies

Suttle Lake Data Buoy

For some time, sockeye salmon weren’t able to reach Oregon’s Suttle Lake due to barriers along the Deschutes and Metolius Rivers that kept them out. But thanks to recent remediation efforts, the lake has recently been seeing more sockeye migrating from the Pacific Ocean to spawn. That would be no problem if the lake had a healthy food web, but there is evidence that salmon native to Suttle Lake, kokanee […]

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Northern Caspian Sea Dredging

Kazakhstan is a country not often associated with having a shoreline, let alone a marine environment. However, in the western corner of Kazakhstan lies a section of coastline along the Caspian Sea. Through a network of rivers and channels, the Caspian Sea is actually connected to the trade routes of the world’s oceans. To support the expanding oil fields of Western Kazakhstan, a deep-water port is being constructed in the […]

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Campus Pond An Educational Tool

A small campus pond on the New Paltz branch of the State University of New York has a big effect on water quality downstream. Called “The Gunk” by students and staff because of its position near the Shawangunk Mountains, the pond flows directly through the Wallkill River, a tributary of the mighty Hudson River that crosses all of eastern New York. Though The Gunk isn’t a very big pond, researchers and […]

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