CTD48M
Online and memory probe
The CTD48M is a very small multi parameter probe for precise measurements of pressure, temperature, conductivity, and one optional parameter for depth up to 6000 m. Standard sensors: - Conductivity (С) - Temperature (T) - Pressure (D) Optional sensors: - Dissolved Oxygen - Turbidity - pH - Redox (OPR)
Sea & Sun Technology
Trappenkamp, DE
Description
The CTD48M probe is a very small and handy microprocessor controlled multiparameter memory probe for for limnologic and oceanographic measurement with up to 4 sensors and for depth up to 6000 m. It measures conductivity, temperature, pressure and one optional parameter.
Data is stored on a standard flash memory card with up to 128 Mbytes and 3.000.000 CTD data sets.
The CTD48M allows operation in different modes:
- Continuous mode: each data set is stored.
- Time mode: data sets are only stored at programmable intervals with several selectable schemes.
- Increment mode: data sets are stored at programmable depth increments, up to 255 files can be stored without the need for data retrieval in between
- Online mode (RS-232 – on multiconductor cables)
The CTD48M is equipped with a 4 channel data acquisition system with 20 bit resolution. Data output is 16 bit. A high long-term stability and automatic self-calibration of the analogue digital converter guarantees stable and precise CTD measurements for many years.
The probe is turned on / off by touching a reed contact with a magnetic rod. An LED displays the power supply status and the memory access status.
The supplied Standard Data Acquisition Software package “SST-SDA” includes the handling of the logging process and the display of online or recorded data with a shared graphic user interface. The “SST-SDA” is a part of our shipment.
Standard models:
CTD48M:
Online and memory probe for measurement of conductivity, pressure, temperature + 1 optional sensor
Standard sensors:
- Conductivity (С)
- Temperature (T)
- Pressure (D)
Additional sensors:
- Dissolved Oxygen
- Turbidity
- pH
- Redox (OPR)
Calculated parameters:
- salinity
- sound velocity
- Kappa 25 mS/cm
- sigma
Main Features:
- low weight
- easy handling
- up to 4 sensors on the bottom cap
- non-corrosive titanium housing (titanium)
- depth range up to 6000 m
- SDA data acquisition software running under various versions of Microsoft Windows (a part of the shipment)
- calculations according to UNESCO formulae
Specifications
-
General
-
Weight in air [kg]
1.2
Diameter [mm]
48
Length [mm]
450
Housing Material
Titanium
Max. cable length [m]
6000
-
Observations
-
Min. depth increment [m]
0.01
Min. time increment [s]
0.2
Resolution of salinity [psu]
0.001
Uncertainty of salinity [psu]
0.002
Min. sound velocity [m/s]
1400
Max. sound velocity [m/s]
1600
Resolution of sound velocity [m/s]
0.05
Uncertainty of sound velocity [m/s]
0.1
-
Operation Characteristics
-
Data display on dedicated hardware
N
Method of first recording
internal /external
Display of analogue data
Y
-
Pressure, temperature and conductivity sensor
-
Pressure sensor
Y
Type of pressure sensor
piezo resistive
Resolution of pressure [% FS]
0.002
Accuracy of pressure sensor
up to 0.05 %
Temperature sensor
Y
Type of temperature sensor
Pt 100 4-pole
Min. temperature [°C]
-2
Max. temperature [°C]
36
Resolution of temperature [°C]
0.0005
Accuracy of temperature measurement
0.0005
Conductivity sensor
Y
Type of conductivity sensor
7-pole-cell
Max. conductivity [S/m]
70
Resolution of conductivity [10^-3 S/m]
0.005
Accuracy of conductivity measurement
± 0.002
-
Software specifications
-
Software name
SST-SDA
Graphical presentation
Y
Raw data editing
Y
Re-computation with raw data
Y
CTD Probe controller
Y
Recording with third party software
N
-
Environmental
-
Max. depth [m]
6000
Max. pressure [bar]
600
Operating temperature: min. [°C]
-10
Operating temperature: max. [°C]
60
-
Data and connectivity
-
Internal memory
Y
Internal Memory [MB]
8
Max. number of samples for self-recording [10^3]
250
Direct data reading
Y
Connectors
RS232
Type of internal memory
non-volatile memory
Dedicated sub-surface data logger
Y
Dedicated surface data logger
Y
Telemetry link to remote location
Y
-
Power
-
Min. operating power [V]
9
Max. operating power [V]
30
Battery
Y
Battery type
Alkaline / Lithium
-
Additonal sensors
-
Standard sensor
pressure, temperature, conductivity
No. of additional sensors
1
Description of additional sensors
optical sensor, dissolved oxygen, pH, Redox (ORP), turbidity, H2S
