Sea-Bird Electronics SBE 38 User Manual download pdf (Page 6)

Section 2: Description of SBE 38

This section describes the functions and features of the SBE 38, including

specifications and dimensions.

System Description

Sophisticated A/D acquisition electronics, ultra-stable thermistor, and state-of-

the-art calibration provide the standards-level performance of an expensive

AC bridge and platinum thermometer at a small fraction of the cost. The

SBE 38 is unaffected by shock and vibration, has high accuracy and stability,

and is easy to use. It has a rugged, corrosion-proof, 10,500 meter (34,400 foot)

titanium pressure housing. Real-time temperature data is transmitted in ASCII

characters (in °C or raw counts) via an RS-232 or optional RS-485 serial

interface for display or logging by PC or data logger.

The SBE 38’s measurement range is -5 to +35 °C. Absolute accuracy is better

than 0.001 °C (1 mK) and resolution is approximately 0.00025 °C (0.25 mK).

Each sensor includes certification that demonstrates drift of less than 0.001 °C

(1 mK) during a six-month period.

Applications include calibration baths, oceanographic/aquatic research, and

environmental monitoring.

The SBE 38 operates in one of three ways:

• RS-232 (full duplex) with one SBE 38 connected to the interface

• RS-485 (half duplex) with one SBE 38 connected to the interface

• RS-485 (half duplex) with several RS-485 sensors sharing one pair

of wires

On power-up, the SBE 38 reads its EEPROM, which includes calibration

coefficients and other setup information. As programmed, the SBE 38 samples

and transmits temperature continuously, or waits for a command to begin

sampling. Note that for RS-485 applications with several sensors sharing one

pair of wires, the SBE 38 cannot sample continuously.

The SBE 38 is frequently integrated as a remote temperature sensor with one

of our thermosalinograph instruments (SBE 21 Thermosalinograph or SBE 45

MicroTSG), to provide accurate sea surface temperature. See the manuals for

those instruments for integration information.

The SBE 38 is supplied with a powerful Win 2000/XP software package,

SEASOFT-Win32, which includes:

• SEATERM terminal program for easy communication.

• SEASAVE V7 real-time data acquisition and SBE Data Processing

post-processing programs –SEASAVE V7 and SBE Data Processing can

be used to view and process the entire data stream, including data from the

SBE 38, when the SBE 38 is integrated with one of the following -

SBE 21 or 45 thermosalinograph;

SBE 16plus, 16plus V2, or 16plus-IM V2 SEACAT C-T Recorder; or

SBE 19plus V2 SEACAT CTD Profiler.

Notes:

• Help files provide detailed

information on the use of

SEATERM, SEASAVE V7, and

SBE Data Processing.

• Separate software manuals on

CD-ROM contain detailed

information on the setup and

use of SEASAVE V7 and SBE Data

Processing.

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Sea-Bird Electronics SBE 38 User Manual Page 6

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