Temperature (& Pressure) Recorder
SBE 39

DESCRIPTION

The SBE 39 is a high-accuracy temperature (pressure optional) recorder with internal battery and non-volatile memory for deployment at depths up to 10,500 meters (34,400 feet). The 39 is intended for moorings or other long-term, fixed-site applications, as well as shorter-term deployments on nets, towed vehicles, or ROVs. Calibration coefficients are stored in EEPROM, and uploaded data is in ASCII engineering units (°C and decibars).

The 39's thermistor, the same sensor used in the SBE 16plus V2 SeaCAT and 37 MicroCAT, has a long history of exceptional accuracy and stability; drift is typically less than 0.002 °C per year. Two configurations are offered:

COMMUNICATIONS AND INTERFACING

User-selectable operating modes include:

• Polled Sampling -- sampling and data transmission is triggered by a command from a computer or satellite, radio, or wire telemetry equipment.
• Autonomous Sampling -- sampling occurs at pre-programmed intervals, and can be set up to start at a future time and date. There are two types of Autonomous Sampling --

• Interval: At pre-programmed 3-second (4-second if transmitting in real time) to 9-hour intervals, 39 wakes up, samples, records, and powers off.
• Continuous: 39 continuously samples, and does not power off between samples. Time between samples varies from 0.8 to 1.5 seconds, depending on data format.

• Serial Line Sync -- sampling and data transmission is triggered by a pulse on the serial line, which causes a sleeping 39 to wake up, sample, transmit in real time (programmable option), record, and power-off automatically.

DATA STORAGE AND BATTERY ENDURANCE

The SBE 39's non-volatile FLASH memory can store over 32,000,000 bytes. Temperature and time are always stored (7 bytes/sample), and optional pressure adds 2 bytes/sample; over 3.6 million samples of T, P, and time can be stored. Binary upload capability provides fast upload of large data sets. For example, a 39 uploads 466,000 samples of T, P, and time in only 55 minutes -- including error checking each block of data.

With its 9-volt, non-hazardous, lithium battery (alkaline battery may be substituted), the 39 can acquire more than 150,000 samples of T, P, and time. Because of the low power consumption when not actually sampling, deployments of 3 years or more are possible.

CONFIGURATION

CALIBRATION

SOFTWARE

SPECIFICATIONS

Clock Accuracy: 5 seconds/month

Power Supply/Endurance:

• 9V non-hazardous Lithium Battery (standard): > 150,000 samples
• 9V Alkaline Battery: > 41,000 samples

Quiescent Current: 10 microamps

Current Consumption (per sample):

• T and time: 0.018 amp-second
• T, P, & time: 0.023 amp-second

Current Consumption (continuous sampling): 15 milliamps

External Power (with optional external I/O connector):  9 - 30 VDC

Memory: 64 Mbyte non-volatile FLASH (32,900,000 bytes usable)

• T and time: 4,700,000 samples
• T, P, and time: 3,655,000 samples

(T=3 bytes/sample; time=4 bytes/sample, P=2 bytes/sample)

Housing/depth rating:

• PET plastic: 600 m (1960 ft)
• Titanium: 10,500 m (34,400 ft)

Weight:

Actual Calibration Data For Sensor # 204

ADDITIONAL INFORMATION / LINKS:

Documentation -- manual, photos, technical papers, application notes, etc.

• Current product manual (older manuals)
• Photo Gallery
• Print version of this specification sheet / brochure
• Application Notes:
  - 27Druck: (Druck) Strain Gauge Pressure Sensor Error Sources
  - 42: ITS-90 Temperature Scale
  - 69: Conversion of Pressure to Depth
  - 68: Using USB Ports to Communicate with Sea-Bird Instruments
  - 71: Desiccant Use and Regeneration (drying)
  - 73: Using Instruments with Pressure Sensors at Elevations Above Sea Level
  - 83: Deployment of Moored Instruments
  - 84: Using Instruments with Druck Pressure Sensors in Muddy or Biologically Productive Environments
• Shipment of lithium batteries used to power SBE 39
• Sea-Bird webinar -- Introduction to Sea-Bird, Long-Term Deployments with Moored CTDs, and CTD Profilers

Sales Information -- options, accessories, cables, mount kits, spares, etc.

• Configuration options & accessories:
  - Details for SBE 39
  - Listing for all products
• Cables
• Mount kits
• Spare parts

Software -- components of Seasoft V2

• Deployment Endurance Calculator -- description, download
• Seaterm -- description, download
• SBE Data Processing -- description, download

Links to Other Instruments of Interest

• Other temperature sensors:
  - SBE 39plus -- improved version of SBE 39, with more power and memory, and internal USB interface for fast upload (NEW, February 2014)
  - SBE 39-IM -- Inductive Modem version of SBE 39
  - SBE 3S -- frequency-output temperature sensor, slow response version of SBE 3
  - SBE 3F -- frequency-output temperature sensor, fast response version of SBE 3
  - SBE 3plus -- frequency-output temperature sensor, more rigorously tested and calibration version of SBE 3F
  - SBE 35 -- laboratory standards thermometer for use in fixed point cells and depths up to 6800 m
  - SBE 35RT -- digital reversing thermometer, can be used with SBE 32 Carousel Water Sampler to measure temperature each time a bottle is fired
  - SBE 38 -- digital oceanographic thermometer with RS-232 or RS-485 output, standards-level performance
  - SBE 56 -- high-accuracy temperature recorder with internal battery, non-volatile memory, and USB upload

Specifications are subject to change without notice.

Sea-Bird Home     Phone: (+1) 425-643-9866     E-mail: seabird@seabird.com