SBE 25plus Sealogger CTD

The SBE 25plus Sealogger is the ideal research-quality CTD profiler for coastal, estuarine, and deep-water deployments. The battery-powered 25plus samples at 16 Hz and records data in memory, eliminating the need for a large vessel, electro-mechanical sea cable, and on-board computer, and can also transmit data in real-time.

Pump-controlled, T-C ducted flow minimizes salinity spiking caused by ship heave and allows for slow descent rates without slowing sensor responses, improving dynamic accuracy and resolving small scale structure in the water column.


The 25plus supports numerous auxiliary sensors with eight A/D channels and two RS-232 data channels, with enough power for power-hungry sensors such as nitrate (e.g., SUNA) and CO2. The alkaline battery pack provides power for up to 55 hours of profiling. The unique end cap design provides easy access to bulkhead connectors, simplifying the addition and removal of sensors.


The 25plus is frequently used autonomously, recording data internally. It can also provide real-time acquisition and display over short cables via the RS-232 interface; a load-bearing cable for hand-hauled, real-time profiling is available. External power and communication over 10,000 m of single-core, armored cable can be provided with the SBE 36 Deck Unit and PDIM. The 25plus is easily integrated with a Sea-Bird Water Sampler; both real-time and autonomous auto-fire operations are possible.


Servicing, Calibration and Support

Imbros’ local engineering department can service, repair and calibrate your instrument without expensive shipping costs or wait times.



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