Miniature temperature and depth recorder

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DST centi-TD temperature depth recorder

Data Storage Tag centi - Temperature and Depth


Key features

  • Suitable for monitoring behavior of fishing gear, tidal waves, fish tagging and geothermal well logging
  • Various depth calibration ranges available, up to 3000 m
  • Long battery life, typically 9 years
  • Option for a start/stop recording at pre-defined depth level for saving on memory
  • Miniature data logger, size 46 mm x 15 mm


The DST centi-TD is a miniature temperature and depth recorder. Recorded data is stored in the logger‘s internal memory with a time stamp for each measurement.

The DST centi-TD is supported by the SeaStar software and the Communication Box which serves as an interface between the logger and a PC. Communication between the logger and the Communication Box is wireless when sitting in the box.

In SeaStar the user sets the start time, start date and sampling interval before starting the recorder. Fastest possible sampling interval is 0.1 second. Up to seven different intervals can be set for the same measurement sequence. This is especially useful when more frequent measurements are needed at a certain time period. With default programming temperature and depth are recorded as pairs. Optionally, the two parameters can be set separately as primary and secondary parameters with different sampling frequency. That way memory partitioning can be customized according to individual preferences.

After recovering the DST recorded data is uploaded to SeaStar where results are displayed both in graphic and tabular form. After retrieving the data, the DST can be re-programmed and reused as long as the battery lasts.

A set of Communication Box and SeaStar software needs to be purchased with the first order.

Star-Oddi also offers protective logger housing for the DSTs that gives more flexible mounting options and protects the logger against knocks. The housing is ideal for use at fixed locations, underwater gear or in harsh environments. When used externally on fish in tagging project Star-Oddi can provide tag holder kits for the DST.

For more information about accessories please click here.

Features on Request

Extended memory
DST centi-TD and DST centi-T can be delivered with an extended memory capacity of 523,800 measurements in total (DST centi-ex).

Logic feature
For saving on the memory, the Logic feature allows users to choose a depth limit where the logger starts and stops recording. The depth limit is adjustable in the user software. This feature is ideal when using the data logger on fishing gear as an example, where measurements would only be recorded when the gear is beyond certain depth and stops recording when gear is on deck. The DST centi logic version always comes with the extended memory size, total of 524,000 measurements. 

Real-time temperature and depth monitoring
The DST centi-TD is available with an online feature, allowing the researcher to receive the data in real time from the logger. The unit is then delivered with four external wires (power, ground, Tx and Rx) for connecting to the user’s own embedded system. When connected to the embedded system, data can be polled by the user (RS232 communications) and viewed in SeaStar. If you have a specific application where you need online monitoring of temperature and depth then contact us.

Examples of Application

DST centi-TD can be used as a stand-alone logger for recording depth and temperature in ocean and freshwater environments.   The DST can be fastened to fishing gear, deployment lines, cables, moorings or other underwater equipment, collecting valuable data. The logger is also used for monitoring temperature and depth in geothermal boreholes. The shape of DST-centi TD is designed for tagging fish and marine animals, externally or internally with implantation providing information on fish behavior and migration. When used in in tagging projects the tags are marked with a pre-defined text for recapture purposes.

Examples of studies suitable for DST centi-TD:

  • Fish and marine animal tagging
  • Fisheries research
  • Geothermal well logging
  • Oceanography
  • Marine biology
  • Hydrology
  • Ecosystems research
  • Geology

Technical Specifications

SensorsTemperature and pressure (depth)
Size (diameter x length)15mm x 46mm
Housing materialAlumina (Ceramic)
Weight (in air/in water)in air: 19g
in water: 12g
Memory typeNon-volatile EEPROM
Memory capacity174,000 measurements in total*
Optional memory extension:
524,068 measurements in total*
Memory capacity bytes261,819 bytes / temperature 1.5 bytes, pressure 1.5 bytes
Memory extension option524,068 measurements in total
786,099 bytes (EEPROM memory)
Memory management- Custom programming
- Primary and secondary parameter
Data resolution12 bits
Temperature resolution 0.032°C (0.058°F)
Temperature accuracy+/-0.1°C (0.18°F)
Temperature range -2°C to +40°C (28°F to 104°F)

Temperature response timeTime constant (63%) reached in 20 sec.
Standard depth ranges0.1m-50m
Depth resolution0.03% of selected range
Depth accuracy+/- 0.6% of selected range
Depth response time Immediate
Data retention25 years
ClockReal time clock
Accuracy +/-1 min/month
Sampling intervalUser programmable. Fastest possible interval is 0.1 second
Number of different sampling intervalsSingle interval throughout measuring period.
Or multiple intervals, up to seven.
CommunicationsCommunication Box, RS-232C 9 pin serial and USB
Attachment hole0.9 mm (in diameter)
Battery life9 years**
* Total memory is divided between the two sensors.
** For sampling interval of 10 minutes; temperature and pressure recorded simultaneously.
Specifications may change without notice.

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