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Reference Sheet
Configuration options & accessories
|
Both shown with external thermistor and optional
mooring wire clamp(s); SBE 39 on right with optional net fender / fairing |
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:
The 39's optional Druck pressure sensor employs a micro-machined silicon diaphragm in which the strain elements are implanted with semiconductor fabrication techniques. Unlike metal diaphragms, silicon's crystal structure is perfectly elastic, so the sensor is essentially free of pressure hysteresis. Compensation of temperature influence on pressure offset and scale is performed by the 39's CPU.
COMMUNICATIONS AND INTERFACING
The SBE 39 communicates with a computer via a standard RS-232 interface, at a user-selectable 1200 to 38,400 baud rate. Connection is dependent on the housing:
User-selectable operating modes include:
- 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.
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
A standard SBE 39 is supplied with embedded thermistor, internal connector, and plastic housing for depths to 600 meters. Options include:
CALIBRATION
The SBE 39's inherent accuracy, resolution, and stability, combined with a rigorous 11-point temperature calibration, yields a true research-quality tool. Primary temperature standards (water triple point and gallium melting point cells) and state-of-the-art equipment are maintained in our NIST-traceable calibration facility. Pressure calibrations are referenced to specially maintained (at Sea-Bird) Paroscientific Digiquartz sensors that trace to Paroscientific's pressure standard.
SOFTWARE
The SBE 39 is supplied with a powerful Win 2000/XP software package, SEASOFT© V2, for communication, data upload, data conversion, plotting, and export to other programs.
SPECIFICATIONS
| Measurement Range | Initial Accuracy | Typical Stability | Resolution | |
|
Temperature (°C) |
-5 to 35 | ±0.002 | 0.0002 per month | 0.0001 |
| Optional Pressure |
20 / 100 / 350 /
600 / 1000 / 2000 / 3500 / 7000 meters (Expressed in meters of deployment depth capability) |
0.1% of full scale range | 0.05% of full scale range per year | 0.002% of full scale range |
Clock Accuracy: 5 seconds/month
Power Supply/Endurance:
Quiescent Current: 10 microamps
Current Consumption (per sample):
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=3 bytes/sample; time=4 bytes/sample, P=2 bytes/sample)
Housing/depth rating:
Weight:
|
Housing (without external connector) |
In Air | In Water |
| Plastic (configured with embedded thermistor) * | 0.6 kg (1.2 lbs) | 0.25 kg (0.6 lbs) |
| Titanium (configured with thermistor in sheath) * | 1.2 kg (2.6 lbs) | 0.7 kg (1.6 lbs) |
| * Other configurations vary slightly. | ||
Actual Calibration Data For Sensor # 204
Calibration Date: 19 May 2000
a0= -1.661595e-04 a1= 3.079553e-04 a2= -4.625199e-06 a3= 2.075766e-07
|
Bath Temperature (°C) |
Instrument Output (n) |
Instrument Temperature (°C) |
Residual (°C) |
| -1.5115 1.0482 4.6236 8.1305 11.6344 15.1949 18.6590 22.1592 25.6867 29.1579 32.6336 |
786460.1 700444.0 597614.7 513142.6 442083.3 381161.9 330948.6 287767.8 250672.7 219443.9 192584.6 |
-1.5115 1.0482 4.6236 8.1305 11.6344 15.1949 18.6590 22.1592 25.6866 29.1579 32.6337 |
0.0000 -0.0000 0.0000 0.0000 -0.0000 -0.0000 0.0001 0.0000 -0.0001 -0.0001 0.0000 |
Click on the thumbnail to view the graph of the data.
ADDITIONAL INFORMATION / LINKS:
Documentation -- manual, photos, technical papers, application notes, etc.
Sales Information -- options, accessories, cables, mount kits, spares, etc.
Software -- components of Seasoft V2
Links to Other Instruments of Interest
Specifications are subject to change without notice.
Last modified: 23 Feb 2011
Sea-Bird Home Phone: (+1) 425-643-9866 Fax: (+1) 425-643-9954 E-mail: seabird@seabird.com
