Brochure/specifications in pdf format Manual Reference Sheet Configuration
The SBE 50’s pressure sensor (offered in eight full scale ranges from 20 to 7000 dbars) is the superior, micro-machined, silicon strain-gauge recently developed by Druck, Inc. This new design is entirely different from conventional ‘silicon’ types in which the deflection of a metallic diaphragm is detected by epoxy-bonded silicon strain gauges. The Druck sensor employs a micro-machined silicon diaphragm into which the strain elements are implanted using semiconductor fabrication techniques. Unlike metal diaphragms, silicon’s crystal structure is almost perfectly elastic, so the pressure hysteresis is minimal. Compensation of the temperature influence on pressure offset and scale is performed by the SBE 50’s CPU.
The SBE 50 is an easy-to-use, light, compact instrument ruggedly made of titanium and other low-maintenance (plastic) materials; it is well suited to even the smallest vehicle. Commands sent to the SBE 50 provide status display, data acquisition setup, and diagnostic tests. The SBE 50 must be externally powered, and its RS-232C data (and/or optional 0 - 5 volt output) logged or telemetered by the vehicle to which it is mounted. The SBE 50 does not support auxiliary sensor inputs.
SAMPLING MODES
The SBE 50 has two sampling modes:
Autonomous sampling – The SBE 50 runs continuously and samples at sixteen scans per second (16 Hz). It can be set to average up to 255 samples, transmitting only the averaged data. The SBE 50 can be programmed to begin autonomous sampling when power is applied or on command.
Polled sampling – On command, SBE 50 takes one sample and transmits the data.
DATA OUTPUT
The SBE 50 outputs:
Raw pressure and pressure temperature values, or
Data in ASCII engineering units (pressure in decibars or psia, or depth in meters or feet) – pressure is calculated using calibration coefficients stored in EEPROM; depth is calculated from pressure, based on user selection of salt or fresh water and user-input latitude.
STANDARD FEATURES AND OPTIONS
The SBE 50 is supplied with:
The SBE 50’s optional Voltage Output interface provides 0 - 5 volt output proportional to the pressure or depth, in addition to the RS-232C output. When equipped with the Voltage Output Interface, the SBE 50 uses a 6-pin I/O bulkhead connector.
A Windows 95/98/NT/2000/XP terminal program, SEATERM, is supplied for instrument setup, status display, and diagnostics.
SPECIFICATIONS
Measurement Range: 0 to 20 / 100 / 350 / 600 / 1000 / 2000 / 3500 / 7000 meters (expressed in meters of deployment depth capability)
Initial Accuracy: 0.1% of full scale range
Typical Stability: 0.004% of full scale range per month
Resolution:
0.002% of full scale range
(D/A resolution for optional 0-5 volt output: 16 bit)
Power Requirements: 8 - 30 VDC
Housing Material: 3AL/2.5V Titanium
Depth Rating: 7000 meters (22,900 feet)
Weight:
In air 0.7 kg (1.5 lbs)
In water 0.4 kg (0.9 lbs)
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ADDITIONAL INFORMATION / LINKS:
Documentation -- manual, photos, technical papers, application notes, etc.
Sales Information -- options, accessories, spares, cables, mount kits, etc.
Links to Other Instruments of Interest
Last modified: 06 Apr 2007
Sea-Bird Home Phone: 425-643-9866 Fax: 425-643-9954 E-mail: seabird@seabird.com
