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SBE 48 Hull Temperature Sensor

SBE 48 Hull Temperature Sensor

Temperature recorder installed with magnets just below water line on inside of ship, providing shipboard determination of sea surface temperature.

The SBE 48 is a high-accuracy temperature recorder with non-volatile memory, designed for shipboard determination of sea surface temperature. Mounted with magnets just below the water line, the SBE 48’s temperature sensor is in contact with the inside of the ship’s hull. The SBE 48’s internal battery runs the real-time clock and can be used to power the instrument for very short deployments; external power is recommended for typical deployments.

Data is recorded in memory and can also be output in real-time in engineering units. Memory capacity exceeds 4.7 million samples of temperature and time; this yields approximately 54 days of data when sampling every 1 sec.


  • Temperature and time on command, continuously at approximately 1 sample/sec, or at user-programmable 3-sec to 9-hour intervals.
  • RS-232 interface.
  • Internal memory (4.7 million samples), powered externally.
  • Seasoft© V2 Windows software package (setup, data upload, and data processing).
  • Five-year limited warranty.


Measurement Range -5 to +35 °C
Initial Accuracy ± 0.002 °C
Typical Stability 0.0002 °C per month
Resolution 0.0001 °C
Clock Accuracy 1 minute/year
Sampling Speed Approximately 1 Hz (1 sample/sec), or
user-programmable 3-sec to 9-hour intervals
Memory 4.7 million samples (temperature and time)


Internal Battery 9V non-hazardous lithium battery.
Runs real-time clock (5 - 10 year battery endurance).
Can power SBE 48 for up to 180,000 samples if external power not supplied.
External Power 8 - 16 VDC
Power Consumption Quiescent Current: 10 µA
Operating Current: 0.015 A-sec/sample; 15 mA for continuous sampling


Materials PVC housing
Weight 2.3 kg

The list below includes (as applicable) the current product brochure, manual, and quick guide; software manual(s); and application notes.

For older SBE 48 product manuals, organized by instrument firmware version, click here.

Title Type Publication Date PDF File
SBE 48 Datasheet Product Datasheet Monday, August 24, 2015 PDF icon 48brochureAug15.pdf
SBE 48 Manual Product Manual Monday, July 11, 2016 PDF icon 48_006.pdf
SBE 48 Quick Guide Product Quick Guide Monday, July 28, 2008 PDF icon 48_referencesheet_003.pdf
AN42: ITS-90 Temperature Scale Application Notes Wednesday, May 18, 2016 PDF icon appnote42May16.pdf
AN68: Using USB Ports to Communicate with Sea-Bird Instruments Application Notes Friday, October 19, 2012 PDF icon appnote68Oct12.pdf

HULL TEMPERATURE SENSOR - Includes 32 MB usable memory, RS-232 interface, lithium back up battery (non-hazardous), 2.4 m data I/O cable 801431 (data I/O cable may be deleted for credit), Seasoft software, & complete documentation.




  • 801431 To computer COM port, 2.4 m, DN 32805
  • 801432 To computer COM port, 10 m, DN 32805