DST milli-TD

Small Depth Temperature Logger

Economical and autonomous data logger recorder with temperature and pressure sensors for studies in aquatic environments. Large memory for fast sampling.

Easy to mount on submersible gear and moorings for both short and long term studies in underwater environments.

DST milli-TD, submersible temperature and depth logger

Small and handy depth water level logger
Flexible mounting with protective housing
Pressure sensors from low to higher ranges
Large memory size
High temperature logger version available

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Description
Using the logger
Specifications
Accessories
Documentation

Description
Small and handy

This small autonomous depth and water temperature recorder is ideal for placement in different aquatic conditions, with dimensions of only 39.4 mm x 13 mm. Adding the plastic protective housing makes it easy to mount on submersible gear and moorings.

Application

The small yet high performing depth temperature logger is used for:
- Ecosystem research – water level and temperature monitoring in oceans, rivers and lakes
- Fisheries research – gear behavior and fishing depth logging
- Time depth profiles on underwater gear
- Quality monitoring – temperature and water depth of geothermal boreholes and wells
- Fish and marine animals tagging – more information click here.
Flexible mounting with protective housing

A plastic protective housing is available, recommended when fastening the logger to submersible gear and moorings. It has attachment holes on both ends.

Pressure sensors from low to higher ranges

There are various pressure ranges available. Pressure calibration ranges selectable up to 50 m, 100 m, 250 m, 500 m or 800 m. The shallower the range the better the pressure resolution and accuracy.

Long life in a small logger

The battery life is 3.5 years, measuring at 5 minute interval. Recorded data is stored in the logger‘s internal memory with a time stamp for each measurement.

Large memory size

The logger has large memory capacity 699000 paired temperature and depth measurements, or ca 1.4 million measurements in total.

High temperature logging

The standard temperature range is -1°C to +40°C (30°F to 104°F). Calibration range can be extended upon request, up to max 85°C (185°F).
Using the logger
Simple in Use, From Setup to Data Retrieval

The logger and the accompanying items are designed for ease of use throughout the research process, from setting up the logger, attaching it, to retrieving and analysing the data. The logger is supported by the SeaStar software and a Communication Box which have to be purchased with the first order.

Programming the logger

To set the logger for starting measurements it is placed into the Communication Box that connects with a USB cable to a PC computer. In the SeaStar software, the user sets the start time, start date and sampling interval before starting the tag for measuring. The logger synchronizes its internal clock with the date & time on the computer being used.

Primary and secondary sensors

Normally both sensors temperature and depth are measured simultaneously. But to save on memory size it is possible to choose different intervals for either of the two sensors, temperature and depth. The primary sensor chosen would therefore have a faster interval and secondary sensor measured less frequently.

Single or multiple intervals

There are two modes for sampling, either at a single interval throughout the period or multiple intervals. When choosing multiple intervals programming it is possible to define up to seven different intervals and number of measurements for each interval. Shifting between wide and narrow intervals can help in extending the measuring period due to memory limitation and have more frequent measurements during certain time periods.

Memory and Battery Life Calculations

The software automatically calculates when memory fills based on certain interval settings, making it easier for the user to decide how to program the logger. Estimation on battery consumption during that time period is also calculated.

Uploading the Data

After recovering the logger, it is inserted into the communication box and the recorded data is uploaded to the software. The results are displayed both in graphic and tabular form and the data can be exported to other programs. The time series data shows each measurement with its own time stamp.

Low energy consumption

After data retrieval the logger can be reused, as long as the batteries inside last. Battery life estimation is always reported upon connection with the logger. Due to the low energy consumption circuitry design the battery life is long, but actual lifetime depends on usage and sampling interval used.

Accessories
Communication box

The Communication Box serves as an interface between the DST and a PC computer. It is used for connecting to the DST, when starting the logger and retrieving data. DST is inserted into the hole of the box for wireless communications. The box comes with a USB cable for connecting to a PC computer.

SeaStar software

The SeaStar software for Windows is needed to operate the DST. Data is displayed in a graph and table. The time series data file can be opened in other programs. An installation product key is provided when ordering the software, for online downloading.

Plastic protective housing

Star-Oddi offers protective housing for the DST to give more flexible mounting options and to protect the data logger when used under more harsh environmental conditions. When used as a stand alone logger it can be attached to fishing gear, moorings, deployment lines or other equipment. It has attachment points (6 mm in diameter) on top and bottom. The protective housing is made of polyurethane (PUR) plastic. The housing dimensions are 75 mm in length x 30 mm in diameter. Weight is 50 g in air and 10 g in water.

Wire clip for plastic protective housing

This is ideal for fastening the equipment to fishing gear and long lines. The wire fasteners are made of non-corrosive stainless steel with a clip to ensure secure fastening. The length of the wires can be adjusted to fit the application.

Stainless steel protective housing for DST

Star-Oddi offers stainless steel protective housing for DST loggers. We recommend using them along with a plastic housing to give extra protection. It is ideal when the logger is being used on large trawls or in situations where the bendable plastic housing would not give enough protection. Dimensions of the steel housing are 125 mm x 42.4mm. Thickness is 3.25mm and it weighs 356 g in air.
Documentation
DST marketing brochure

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Sensors	Temperature and pressure (depth)
Size (Diameter x Length)	13mm x 39.4mm
Housing Material	Alumina (Ceramic)
Weight (in Air/in Water)	12g/7g
Data Resolution	12 bits
Temperature Range	-1°C to +40°C (30°F to 104°F)**
Temperature Resolution	0.032°C (0.058°F)
Temperature Accuracy	Standard range: +/-0.1°C (0.18°F), Extended range: +/-0.2°C (0.36°F)
Temperature Response Time	Time constant (63%) reached in 12 sec.
Standard Depth Ranges	0.1m-50m, 0.1m-100m, 1m-250m, 5m-500m, 5m-800m
Depth Resolution	0.03% of selected range
Depth Accuracy	+/-0.6% of selected range
Depth Response Time	Immediate
Pressure Ranges	5 bar, 10 bar. 25 bar, 50 bar, 80 bar
Pressure Resolution	0.03% of selected range
Pressure Accuracy	+/-0.6% of selected range
Memory Type	FLASH
Memory Capacity	1,398,102 measurements in total*
Number of Measurements	699,000 paired temp-pressure/depth meas.
Memory Capacity Bytes	2 MB
Measurement Interval	User specified in second(s) minute(s), or hour(s)
Minimum Measurement Interval	0.1 second fastest
Burst Measuring Option	10 Hz (10 measurements per sec.)
Multiple Intervals Option	Up to 7 different intervals
Measurement Options (Primary/Secondary)	Temperature or pressure/depth as primary with faster interval
Data Retention	25 years
Clock	Real time clock. Accuracy +/-1 min/month.
Communications	Communication Box, wireless transmission when DST sits in the box. Connection to PC: USB cable.
Attachment Hole	0.9 mm (diameter)
Battery Life	3.5 years***
Replaceable Battery	No

DST milli-TD

Small Depth Temperature Logger

Economical and autonomous data logger recorder with temperature and pressure sensors for studies in aquatic environments. Large memory for fast sampling.

Easy to mount on submersible gear and moorings for both short and long term studies in underwater environments.

Key features

Small and handy

Application

Flexible mounting with protective housing

Pressure sensors from low to higher ranges

Long life in a small logger

Large memory size

High temperature logging

Simple in Use, From Setup to Data Retrieval

Programming the logger

Primary and secondary sensors

Single or multiple intervals

Memory and Battery Life Calculations

Uploading the Data

Low energy consumption

Communication box

SeaStar software

Plastic protective housing

Wire clip for plastic protective housing

Stainless steel protective housing for DST

Book a Virtual Meeting

DST milli-TD

Small Depth Temperature Logger

Economical and autonomous data logger recorder with temperature and pressure sensors for studies in aquatic environments. Large memory for fast sampling.

Easy to mount on submersible gear and moorings for both short and long term studies in underwater environments.

Key features

Small and handy

Application

Flexible mounting with protective housing

Pressure sensors from low to higher ranges

Long life in a small logger

Large memory size

High temperature logging

Simple in Use, From Setup to Data Retrieval

Programming the logger

Primary and secondary sensors

Single or multiple intervals

Memory and Battery Life Calculations

Uploading the Data

Low energy consumption

Communication box

SeaStar software

Plastic protective housing

Wire clip for plastic protective housing

Stainless steel protective housing for DST

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