Products

DST CTD

Salinity, Temperature, Depth CTD

Overview

Dimensions (diameter x length): 15mm x 46mm
Sensors: Conductivity (salinity), temperature, pressure (depth)
Standard temperature range: -1°C to +40°C
Temperature accuracy: +/-0.1°C
Depth ranges: 100m, 500m or 1200m, 2000m
Depth accuracy: +/-0.4% of selected range
Conductivity ranges: 3 to 37 mS/cm or 13 to 50mS/cm
Salinity accuracy: +/-1 PSU
Memory size: 87,217 measurements per sensor
Battery life: 4 years
Housing material: Alumina (ceramic material)

Description

DST CTD is the smallest salinity logger on the market that measures and records conductivity (salinity), temperature and pressure (depth). Recorded data is stored in the logger‘s internal memory with a real-time clock reference for each measurement.

The DST CTD 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.

In SeaStar, the user sets the start time, start date and sampling interval before starting the recorder. 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. One interval for the whole measurement sequence is more commonly used though.

After recovering the DST data logger, recorded data is uploaded to SeaStar where results are displayed both in graphic and tabular form. After retrieving the data, the logger 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 offers a plastic protective housing for use under harsh environmental conditions and for mounting to buoys, deploymnet lines, moorings or underwater gear. For fish tagging projects Star-Oddi can provide a special tag holder kit for fastening the DST externally on fish.

For more information about accessories please click here.

Features on Request

Logic Feature
Logic feature allows users to choose a depth limit where the logger starts and stops recording. The logger is in sleep mode while above the predetermined depth, saving memory and battery life. If the DST Logic unit is used in a logger all parameter measurements are taken at the same time – primary and secondary parameter settings are not possible. Logic feature is available for DST centi-T and DST centi-TD with extended memory (DST centi-ex), DST CTD and DST pitch & roll.

Temperature Calibration Outside Standard Range
Temperature calibration outside standard ranges or for smaller ranges is available for all products on request.

Examples of Application

The DST CTD is suitable for studies in e.g.:

• Fish and marine animal tagging (externally)
• Oceanography
• Fisheries research
• Marine biology
• Ichthyology
• Hydrology
• Ecosystems research
• Any other field where temperature, conductivity and pressure recordings are required.

You can read more about research studies and scientific papers here.

Note

Please note that the conductivity sensors are sensitive and measurement accuracy can be affected by biofouling. The warranty does not cover issues concerning biofouling causing offset in salinity measurents, if not traceable to a production fault. In the SeaStar software it is possible to put in an offset value for salinity sensor, correcting salinity offsets.

To read more about possible reasons for biofouling and other causes please click FAQ > Aquatic and Fisheries research.