3D tilt sensor with temperature sensor & pressure sensor

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DST tilt - subsea tilt logger with temperature & pressure sensors

Tilt (3D), temperature and pressure

Overview

Key features

  • Ideal for monitoring orientation of underwater gear or movements of marine animals
  • Available with an adjustable housing that keeps the logger fixed inside
  • Tilt measurements based on an accelerometer and measured in relation to earth's gravity
  • Option for burst measurements (5 recordings per second) for tilt & acceleration
  • Acceleration displayed in the supporting software together with tilt, temp & depth

Description

The subsea DST tilt sensor is a miniature data logger that measures and records temperature, depth (pressure) and tilt (in three directions) in relation to earth's gravity field. Tilt measuring range is +/-90° for each of the axis X, Y and Z. The tilt angle data are shown in degrees. Recorded data is stored in the logger‘s internal memory with a real-time clock reference for each measurement.

The DST tilt 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. 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. It is possible to have burst measurements for the tilt sensor where 5 measurements are recorded per second. 

With default programming depth, temperature, and tilt are recorded at the same time. Optionally TD (Temp-Depth) and tilt can be uncoupled, set as primary and secondary parameter pairs/parameters with different sampling frequency. That way memory partitioning can be customized according to individual preferences.

When the DST has been recovered, recorded data is uploaded to SeaStar where results are displayed both in graphic and tabular form. Since the tilt sensor is in fact an accelerometer the acceleration data are also displayed in the SeaStar software. Therefore both tilt angle data in degrees and acceleration data in m/s2 (meters per second per second) are shown.
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.
For more information about accessories please click here.

Examples of Application

DST tilt is both used for analyzing movements and behavior of fish and marine animals as well as for studying various underwater gear. 

The DST tilt is suitable for various studies:

  • Fishing gear studies (trawl doors, nets, lines)
  • Tilt monitoring of fishing traps and cages
  • ROV and AUV orientation studies
  • Fish and marine animal tagging
  • Orientation of gethermal boreholes
  • Any other field where tilt angle monitoring is required

Accessories
Star-Oddi offers the Adjustable Housing for DST tilt, specially designed to immobalise the tilt sensor and protect the logger against impact. It has flexible mounting options, making it easier to attach to gears and cables. More details here. For external tagging of fish Star-Oddi can provide a special tag holder kit.

Technical Specifications

SensorsTilt (3-D), temperature, pressure*
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 capacity43,598 measurements per channel
(if all parameters are recorded simultaneously)
Memory capacity bytes392,379 bytes / temperature-pressure 3 bytes, tilt 6 bytes
Memory management- Custom programming
- Primary and secondary parameter
Data resolution12 bits for TD, 15 bits for tilt
Temperature resolution0.032°C (0.058°F)
Temperature accuracy+/-0.1°C (0.18°F)
Tilt resolution 0.2°
Tilt accuracy +/-3°
Temperature range -1°C to +40°C (30°F to 104°F)***
Temperature response timeTime constant (63%) reached in 20 sec.
Standard depth ranges0.1m-50m, 0.1m-100m, 1m-270m, 5m-800m, 5m-1500m, 10m-3000m
Depth resolution0.03% of selected range
Depth accuracy +/-0.4% of selected range between 50m and 270m range, +/-0.6% of selected range between 800m and 3000m
Depth response time Immediate
Data retention 25 years
ClockReal time clock
Accuracy +/-1 min/month
Sampling intervalUser programmable
Number of different sampling intervals1 to 7 different intervals within a measurement sequence
CommunicationsCommunication Box, RS-232C 9 pin serial or USB
Attachment hole0.9 mm (in diameter)
Tilt range+/-90° (180° span)
Battery life4 years**
* Pressure and temperature sensors optional.
** For sampling interval of 10 minutes; tilt, temperature and pressure recorded simultaneously.
*** Outside ranges available upon request.
Specifications may change without notice.

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