Star-Oddi.com Aquatic & Fisheries Research DST CTD Salinity Tags

You are here : Home > Aquatic & Fisheries Research > Aquatic & Fisheries Products Star-Oddi.com > Data Sorage Tags > DST CTD - Salinity

DST CTD and DST CT - Data Storage Tag/Archival tag
Conductivity (Salinity), Temperature (and Depth) recorder

Overview
Sensors: Salinity, Temperature and Depth (optional)
Memory size: DST CTD 87,000 & DST CT 130,000 measurements pr. sensor
Battery life: ~4 years
Depth: Custom defined
Conductivity ranges:
1) 3 to 37 mS/cm
2) 13 to 50 mS/cm

  • The smallest salinity logger on the market
  • Specially designed for tagging fish: for analyzing fish migration, distribution and feeding behavior
  • Ideal as a stand-alone logger for sampling in the ocean for environmental studies
  • Weighs only 19g in air and 12g in water
  • Dimensions only 15mm x 46mm (0.6 in x 1.8 in)
  • Memory capacity 87,000 measurements per sensor (DST CTD) or 130,000 (DST CT)
  • Conductivity (salinity), temperature and depth ranges selected by the customer
  • 12 bit resolution
  • 4 years battery life (typical)

Applications
DST CTD and DST CT are the smallest salinity loggers on the market.  The DST CTD is specially designed as an archival tag for tagging fish: for analysing fish migration, distribution, feeding behavior, vertical and horizontal movements.  DST CTD and DST CT must be fastened externally on the fish as the salinity sensor must be in direct contact with the seawater.  Star-Oddi can provide fasteners for external attachment if used as an archival tag.  The archival tags are also ideal for research on other marine animals.  The recaptured archival tag can provide valuable information on the behavioral patterns of the tagged animal.  For recapture and return purposes, customers can define their own text on the housings. The housing is made of bio-compatible material, which does not endanger the health of the tagged animal. The non-transparent housing ensures that the sunlight does not affect the measurements, providing more reliable data.      

DST CTD can also be used as a stand-alone logger for sampling in the oceans.  DST CT without depth recordings is ideal for mooring applications, at a fixed known depth, increasing the memory size, and lowering the price.  Star-Oddi offers protective plastic housing, for use under more harsh conditions (see pictures below).

DST CTD logger externally attached to cod  DST CTD logger and a protective housing
Protective housing attached to fishing gear  Protective housing attached to fishing trawl
Easy to use
DST CTD logger and DST CT logger are supported by the SeaStar software for Windows, and a communication box which connects to a PC computer.  All communications and data transfer are wireless via the communication box.  DST is inserted into the box for establishing communication, using the software.  There is no need for opening the DST, and the logger can be reprogrammed and reused as long as battery lasts.  Before use the user sets the sampling interval and starting time.  After recapture of the tag, the data is analyzed on a PC computer, using the communication box and software. 
DST logger inside a communication box (wireless communication) SeaStar supporting software

Technical Specifications 
 

Sensors Conductivity (salinity), Temperature & Depth

Size (diameter x length)

17 mm  x 46 mm
Weight (in air/in water)
21g / 13g
Memory capacity
DST CTD
DST CT

DST CTD 87,000 measurements pr. sensor
DST CT   130,000 measurements pr. sensor
Memory 131K
Memory Management Custom Programming
Memory type
Non-volatile EEPROM
Data Resolution 12 bits
Conductivity ranges
Available ranges (customer specified):
1) 3 to 37 mS/cm
2) 13 to 50 mS/cm
Salinity range
Depends on conductivity range selected
Resolution salinity (avg.)
0.02 PSU
Resolution conductivity(avg.)
 0.04 mS/cm
Accuracy salinity
 +/- 1 PSU
Temperature range
-1°C to +40°C (30°F to 104°F)
Resolution temperature (avg.)
0.032°C (0.058°F)
Accuracy temperature
+/-0.1°C (0.18°F)
Depth range
customer specified
Standard depth ranges (Customer specified) 100 m, 500 m, 1200 m, 2000 m
Resolution depth (avg.)
0.03% of full scale (FS)
Accuracy depth
+/-0.4% of selected range
Accuracy conductivity  +/-1.5 mS/cm
Response time depth Immediate response
Response time temp. 20 seconds time constant (63%)
Clock
Real time clock.  Accuracy +/-1 min/month
Sampling interval
In seconds, minutes or hours
Number of different sampling intervals 1 to 7, logger can be programmed with one or up to seven different intervals. If multiple intervals are used, number of samplings are defined for each sampling interval.
First recording
At once or at any future time
Computer interface
Communication box, serial or USB
Battery life
4 years**
Data retention
25 years
Attachment hole
0.9 mm (in diameter)***

* Depth can optionally be skipped (DST CT).
** For sampling interval of 10 minutes or greater.
*** If the plastic protective housing is used, attachment hole is 6 mm.
Specifications may change without notice.

Aquatic & Fisheries Research