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SBE-25plus SeaLogger

SBE-25plus SeaLogger
The SBE 25plus Sealogger is the ideal research-quality CTD profiling system for coastal, estuarine, and budget-minded deep-water deployments.

SBE-25plus SeaLogger

Sea-Bird Electronics

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

Compared to the previous SBE 25, the 25plus incorporates an electronics upgrade, mechanical redesign, and additional features, with 16 Hz sampling, 8 differentially amplified A/D input channels, 16-bit A/D resolution for auxiliary sensor channels, more power for auxiliary sensors such as nitrate (e.g., Satlantic SUNA) and CO2 sensors, 2 RS-232 data input channels, and 2 GB memory. Data in memory is uploaded via the external bulkhead connector or the internal USB connector (for fast upload of large data sets). Firmware upgrades can be downloaded through the communications port, without opening the CTD. The unique end cap design provides easy access to bulkhead connectors, simplifying the addition and removal of sensors from the package.


Temperature and conductivity are measured by the modular Sea-Bird SBE 3F and SBE 4C sensors. The SBE 5 Pump and TC Duct provide pump-controlled, TC-ducted flow, to ensure coordinated measurement of the same parcel of water. This significantly reduces salinity spiking caused by ship heave, and in calm waters allows slower descent for improved resolution of water column features. The integrated, temperature-compensated strain-gauge pressure sensor is available in 8 depth ranges to suit the operating depth requirement. The 25plus includes interface electronics for up to 8 voltage-output sensors (dissolved oxygen, pH, fluorescence, PAR, light transmission, optical backscatter, etc.) and 2 serial output (RS-232) sensors.


The 16 Hz scan rate provides very high spatial resolution of oceanographic structures and gradients, and recording endurance of up to 55 hours (without auxiliary sensors) with alkaline batteries. Simultaneous with recording, real-time data can be transmitted directly to a PC serial port (transmission distance dependent on number of auxiliary sensors, baud rate, and cable properties; serial output sensor data cannot be transmitted). Recorded data are transferred via RS-232 or USB to a PC for processing. External power and two-way real-time communication over 10,000 meters of single-core, armored cable can be provided with the SBE 36 CTD Deck Unit and the Power/Data Interface Module (PDIM). The SBE 25plus is easily integrated with an SBE 32 Carousel Water Sampler or SBE 55 ECO Water Sampler. Both real-time and autonomous auto-fire operations are possible with any Sea-Bird CTD / Water Sampler system.


Brochure SBE-25 plus - Download

Manuale SBE-25plus - Download

Application Note
AN 02D: Instructions for Care and Cleaning of Conductivity Cells (03/14) - Download
AN 06: Determination of Sound Velocity from CTD Data - Download
AN 10: Compressibility Comp of SBE Conductivity Sensors (05/13) - Download
AN 12-1: Pressure Port Oil Refill Procedure & Nylon Capillary Fitting Replacement - Download
AN 14: 1978 Practical Salinity Scale - Download
AN 27Druck: Minimizing Strain Gauge Pressure Sensor Errors - Download
AN 34: Instructions for use of Conductivity Cell - Download
AN 36a: Installation of P/N 50094 Conductivity Cell Tubing Connector Kit - Download
AN 38: Fundamentals of the TC Duct and Pump-Controlled Flow Used on Sea-Bird CTDs - Download
AN 42: ITS-90 Temperature Scale - Download
AN 59: A Load-Bearing Underwater Cable for Hand-Hauled, Real-Time Profiling - Download
AN 64-1: Plumbing Installation -- SBE 43 DO Sensor and Pump on a CTD - Download
AN 67: Editing Sea-Bird .hex Data Files - Download
AN 71: Desiccant Use and Regeneration (drying) - Download
AN 73: Using Instruments with Pressure Sensors at Elevations Above Sea Level - Download
AN 75: Maintenance of SBE 5T, 5P, and 5M Pumps - Download
AN 90: Absolute Salinity and TEOS-10: Sea-Bird's Implementation - Download
Guide to CTDs - Download
AN 93: CTD Basics - Download
Advanced Data Processing: Batch Processing - Download

Technical Papers
The acquisition, calibration, and data analysis of CTD data - Download


Technical Papers
ISPRA: Metodologie Analitiche di Riferimento - Download