Aquatic & Fisheries DST Compass Tilt Star-Oddi.com

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A combined compass and tilt logger tag with temperature-depth sensors 

Overview:
Sensors: Compass, Tilt (in 3-D), Temperature and Depth
Memory size:  20,000 measurements per parameter
Battery life: 2 years
Dimensions: 15 mm x 46 mm
Depth: Down to 3000m 
 
Application examples:
  • For analysing fish movements/direction over longer periods.
  • Finding pattern infish behavior, diurnal/seasonal, for improving knowledge on the ocean's resources.
  • Analysing orientation of fishing equipment, and underwater gear.

Features

  • The DST comp-tilt measures in addition to temperature and depth, relative compass heading of the DST, with reference to the magnetic north, and tilt in 3 directions.
  • The data for the compass heading and tilt are showed in degrees (°).
  • Compass measurements are tilt compensated, meaning that an increase in tilt has little influence on the compass accuracy.
  • The compass measurements have +/-15° accuracy, and tilt +/-2° accuracy.
  • The tag can be programmed with different sampling intervals for compass-tilt and temperature-depth.
The sensor can be used for analysing movements of marine animals as well as various underwater gear. For analysing fish movements, it is advised to fasten the tag at both ends to avoid limiting movements of the tag.  For this external tagging application, Star-Oddi offers specially designed fastener kit where the DST com-tilt is fastened to a plastic plate.
 
       

More pictures taken on a Greenland halibut tagging cruise in Sept. 2008 are available at: http://www.nymand-lund.dk/img/dst/
 
Easy to use

DST series is supported by the SeaStar software for Windows, and a communication box which connects to a PC computer.  All communications and data transfer is wireless via the communication box.  DST is inserted into the box for establishing communication, using the SeaStar software.  Before use the user sets the sampling interval and start time of recordings.  After recapture the data is transferred to a PC computer, using the communication box and SeaStar software.  The logger can be re-programmed and reused as long as the battery lasts.  The data is shown in graph and table, each measurement has its own date and time.
         

Technical Specifications - DST comp-tilt

Sensors Compass, tilt in 3-D, temperature and depth
Size diameter x length
15 mm  x 46 mm
Weight in air/in water
19g / 12g
Memory 4 x 20K
Memory capacity
20,000 measurements per parameter*
Memory Management
-Custom programming
-Primary and secondary parameter
(uncoupling compass-tilt and temp-depth)
 
 
Memory type
Non-volatile EEPROM
Data retention
25 years
Resolution compass 1° 
Accuracy compass
 +/-15°
Resolution tilt 0.2°
Accuracy tilt +/-2°
Temperature range
-1°C to +40°C (30°F to 104°F)**
Resolution temperature
0.032°C (0.058°F)
Accuracy temperature
+/-0.1°C (0.18°F)
 
 
Resolution depth
0.03% of full scale (FS)
Accuracy depth
+/-0.4% of selected range
Response time temp. Time constant (63%) reached in 20 sec.
 
 
Clock
Real time clock.  Accuracy +/-1 min/month
Sampling interval
User defined, in sec./min./hour(s)
First recording
User defined start date and time
Computer interface
RS-232C 9 pin serial or USB
Battery life
2 years****
Attachment hole
0.9 mm (in diameter)

* Temp. and depth measurements can be skipped, increasing the memory size to 26,000 compass-tilt measurements.
**Outside ranges available upon request.
***Customer specified.
**** For sampling interval of 15 minutes or greater.
Specifications may change without notice.

Aquatic & Fisheries Research