|Sensors||Conductivity (salinity) and temperature|
|Size (Diameter x Length)||15mm x 50mm|
|Housing Material||Alumina (Ceramic)|
|Weight (in Air/in Water)||21g/13g|
|Data Resolution||12 bits|
|Conductivity Ranges||Choose between: 13-63 mS/cm, 13-50 mS/cm, 3-37 mS/cm or 0.3 to 5 mS/cm|
|Conductivity Resolution||Range 13-63 mS/cm: 0.02 mS/cm, Range 13-50 mS/cm: 0.01 mS/cm, Range 3-37 mS/cm: 0.01 mS/cm, Range 0.3-5 mS/cm: 0.002 mS/cm|
|Conductivity Accuracy||Range 13-63 mS/cm: +/-2 mS/cm, Range 13-50 mS/cm: +/-1.5 mS/cm, Range 3-37 mS/cm: +/-1.5 mS/cm, Range 0.3-5 mS/cm: +/-0.3 mS/cm|
|Salinity Range||Depends on conductivity and temp. range (consult with Star-Oddi)|
|Salinity Resolution||*Range 13-63 mS/cm: 0.01 PSU, Range 13-50 mS/cm: 0.01 PSU, Range 3-37 mS/cm: 0.01 PSU, Range 0.3-5 mS/cm: 0.0005 PSU|
|Salinity Accuracy||*Range 13-63 mS/cm: +/-1.5 PSU, Range 13-50 mS/cm: +/-1 PSU, Range 3-37 mS/cm: +/-1 PSU, Range 0.3-5 mS/cm: +/-0.1 PSU|
|Temperature Range||-1°C to +40°C (30°F to 104°F)|
|Temperature Resolution||0.032°C (0.058°F)|
|Temperature Accuracy||+/-0.1°C (0.18°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)|
|Memory Type||Non-volatile EEPROM|
|Memory Capacity||130,826 measurements per sensor|
|Memory Mangement||Custom programming|
|Sampling Interval||User specified in second(s) minute(s), or hour(s)|
|Minimum Measuring Interval||1 second|
|Multiple Intervals Option||Up to 7 different intervals|
|Data Retention||25 years|
|Clock||Real time clock. Accuracy +/-1 min/month.|
|Communications||Communication Box, wirelss transmission when DST sits in the box. Connection to PC: USB cable.|
|Attachment Hole||0.9 mm (diameter)|
|Battery Life||4 years**|
* Based on conductivity full scale accuracy at 24°C.
** For sampling interval of 10 minutes.
Warranty: 12 months.
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 CT logger is supported by the SeaStar software and a Communication Box which have to be purchased with the first order.
Programming the Logger
To launch the CT conductivity probe for measuring it is placed into the Communication Box interface 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 recorder in measurement mode. The logger synchronizes its internal clock with the date & time on the computer being used.
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 tag. 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 conductivity 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.