SBE 39-IM to 39plus-IM Comparison

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The original SBE 39-IM was introduced in 2005 and has continuously evolved over the years with periodic, minor upgrades. The SBE 39plus-IM was introduced in May 2016 to replace the SBE 39-IM.

Feature New Version SBE 39plus-IM Old Version SBE 39-IM
Specifications — Accuracy, Stability, Resolution, Calibration Unchanged
Sample Intervals 5 sec to 6 hour 10 sec to 8 hour
Memory Capacity Number of measurements:
  • 9.5 million temperature and time
  • 5.5 million temperature, pressure, and time
Number of measurements:
  • 4.7 million temperature and time
  • 3.0 million temperature, pressure, and time
Battery Capacity (Usually controlled by memory capacity)
Number of measurements:
  • 9.5 million temperature and time
  • 5.5 million temperature, pressure, and time
Number of measurements:
  • 400,000 temperature, pressure, and time
Upload Internal USB (fast upload of large datasets via internal connector), or Inductive Modem Internal RS-232, or Inductive Modem
Data Format Output in user-selectable units — temperature (°C or °F), pressure (dbar or psi), date and time
  • Output sample numbers with measurements
  • Output in XML for easy machine readability
Outputs °C, dbar, date and time
Compatibility with Existing Systems
  • Can emulate old version data format using #iiLegacy=y command
  • Retains old-style commands as well as newer, easier-to-use versions
Housing, Size, Weight, and Mounting Diameter and mounting unchanged; approximately 0.8 inches (21 mm) shorter
Configuration Options Unchanged:
  • Thermistor — embedded or external
  • Pressure sensor — 8 ranges, from 20 to 7000 m
  • Housing — plastic (600 m) or titanium (10,500 m)
Batteries Four AA lithium batteries, which pop into battery holder. Circuit boards are protected by splash-proof plastic casing, minimizing possibility of damaging circuit boards while replacing batteries. Two AA lithium batteries, which pop into battery holder on circuit board. Circuit board encased in cardboard sleeve, exposing electronics while replacing battery.
Software New software:
  • Easy-to-use USB software for updating commonly modified parameters (such as changing sample interval, erasing memory, setting date and time) and uploading and plotting data
  • Terminal programs (IM and USB) for sending full suite of setup and testing commands
Inductive Modem and RS-232 terminal program (Seaterm) and plotting software (Plot39)