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CT 电导率温度记录标记

DST CT salinity (conductivity) & temperature logger

Data Storage Tag Conductivity and Temperature

Overview

Key features

Small and cost effective conductivity meter

Mainly used as a stand-alone CT at monitoring stations or moorings

Dimensions only 50 mm x 15 mm

Available with a plastic protective housing for more flexible mounting options

Selection of different conductivity ranges up to 63 mS/cm

Description

DST CT is the smallest salinity (conductivity) and temperature logger on the world market. The conductivity meter records the data in its internal memory with date and time stamp for each measurement.

The DST CT 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.

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.

Examples of Application

The DST CT can be used as a self contained data logger for sampling in the oceans for environmental data collection salinity and temperature.

The DST CT is suitable for various studies:

Oceanography

Marine biology & ecology

Freshwater inflow

Marine animal tagging (externally)

Star-Oddi can provide a special plastic protective housing for attaching to deployment lines, buoys, or moorings. For more information about accessories please click here.

Conductivity ranges

We offer three conductivity ranges:

You can calculate the most suitable conductivity range for your study with our conductivity calculator.

Conductivity is a combination of salinity and temperature. The DST CTD is basically a conductivity recorder from which the salinity is calculated. To view the graphical display of the connection between conductivity, salinity and temperature for each conductivity type, click on the type names above.

For sensor types I and II the conductivity accuracy is defined as 4%  Full Scale (FS). The low conductivity sensor, type-L, has conductivity accuracy defined as 6% FS. Salinity is a calculated value where the dominating accuracy parameter is the conductivity, thus the salinity accuracy follows the conductivity, i.e. 4% FS for sensor types I and II, and 6% FS for type-L. As the salinity range varies with temperature so does the accuracy unit values (psu).

The variation of salinity range and accuracy unit value with temperature can be seen for each type below:

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 read FAQ

Technical Specifications

Sensors

Conductivity (salinity) and temperature

Size (diameter x length)

15mm x 50mm

Housing material

Alumina (Ceramic)

Weight (in air/in water)

in air: 21g
in water: 13g

Memory type

Non-volatile EEPROM

Memory capacity

130,826 paired CT measurements

Memory capacity bytes

392,478 bytes / conductivity-temperature 3 bytes

Memory management

Custom programming

Data resolution

12 bits

Temperature resolution

0.032°C (0.058°F)

Temperature accuracy

+/-0.1°C (0.18°F)

Temperature range

-1°C to +40°C (30°F to 104°F)

Temperature response time

Time constant (63%) reached in 20 sec.

Pressure tolerance

2500m (please provide the depth you are going to use the logger at so the applicable membrane is applied)

Conductivity ranges

Available ranges (customer specified):
0.3 to 5 mS/cm
3 to 37 mS/cm
13 to 50 mS/cm
13 to 63 mS/cm 

Conductivity resolution

0.01 mS/cm

Conductivity accuracy

+/-1.5 mS/cm

Salinity range

Depends on conductivity range selected

Salinity resolution

0.02 PSU

Salinity accuracy

+/-1 (PSU)*

Data retention

25 years

Clock

Real time clock
Accuracy +/-1 min/month

Sampling interval

In second(s), minute(s) or hour(s)

Number of different sampling intervals

1 to 7 intervals within same measurement sequence

Communications

Communication Box, RS-232C 9 pin serial or USB

Attachment hole

0.9 mm (in diameter)

Operational depth

Pre-defined by user when ordering.
Can be up to maximum 2400 m.

Battery life

4 years **

Start date/time of recordings

Any future time. User programmable.

Application software

SeaStar

* Based on conductivity full scale accuracy at 24°C.
** For sampling interval of 10 minutes.
Specifications may change without notice.


http://www.star-oddi.com/products/27/salinity-temperature-CT-logger/default.aspx

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