CTD90M
Online and memory probe
The online and memory probe CTD90M is a high quality, high accuracy multi-parameter probe with max. 9 sensors of the bottom cap for oceanographic and limnological measurements of physical, chemical and optical parameters for depths up to 6000m.
Sea & Sun Technology
Trappenkamp, DE
Description
The CTD90M is a high quality, high accuracy multi parameter probe for oceanographic and limnologic measurement of physical, chemical and optical parameters with up to 9 sensors and for maximum depth up to 6000 m.
Data are stored in a standard flash memory card with a capacity limited to 128 Mbytes by the internal firmware. Up to 3 000 000 CTD data sets can be recorded on this memory. The actual number depends on the selected storage options and the number of sensors adapted to the probe.
The CTD90M 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).
The CTD90M is equipped with a 16 channel data aquisition system with 16 bit resolution. A high long-term stability and automatic self-calibration of the analogue digital converter guarantees stable and precise CTD measurements for many years.
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.
The power supply of the probe is activated by touching a reed contact with a magnetic rod, LED displays power supply status and optical control of memory access.
Standard models:
CTD90M:
Online probe for measurement of conductivity, depth, temperature + 6 optional sensors
Standard sensors:
- Conductivity (Š”)
- Temperature (T)
- Pressure (D)
Additional sensors:
- Oxygen
- Turbidity
- pH (also H2S-resistant)
- Redox (OPR) also H2S-resistant
- Fluorometer
- Light irradiance(PAR)
- Transmissiometer
- Altimeter
- H2S (hydrogen sulfid)
- Currentmeter (with compass)
Calculated parameters:
- salinity
- sound velocity
- Kappa 25 mS/cm
- sigma
Main Features:
- easy handling
- up to 9 sensors on the bottom cap
- max. 6 external units
- non-corrosive titanium housing (titanium)
- depth range up to 6000 m
- control and operation of water samplers and plancton nets
- SDA data acquisition software running under various versions of Microsoft Windows
(a part of the shipment) - calculations according to UNESCO formulas
Specifications
-
General
-
Year of initial development
2007
Weight in air [kg]
6
Diameter [mm]
90
Length [mm]
600
Max. cable length [m]
6000
Housing Material
Titanium
-
Observations
-
Min. depth increment [m]
0.01
Min. time increment [s]
0.2
Uncertainty of salinity [psu]
0.002
Min. sound velocity [m/s]
1400
Max. sound velocity [m/s]
1600
Resolution of sound velocity [m/s]
0.01
Uncertainty of sound velocity [m/s]
0.02
Resolution of salinity [psu]
0.001
-
Operation Characteristics
-
Data display on dedicated hardware
N
Method of first recording
internal /external
Display of analogue data
Y
-
Pressure, temperature and conductivity sensor
-
Max. conductivity [S/m]
70
Resolution of conductivity [10^-3 S/m]
0.0005
Min. temperature [Ā°C]
-2
Max. temperature [Ā°C]
36
Resolution of temperature [Ā°C]
0.0005
Resolution of pressure [% FS]
0.002
Type of pressure sensor
piezo resistive
Accuracy of pressure sensor
up to 0,05
Temperature sensor
Y
Type of temperature sensor
Pt 100 4-pole
Accuracy of temperature measurement
Ā± 0.002
Conductivity sensor
Y
Type of conductivity sensor
7-pole-cell
Accuracy of conductivity measurement
Ā± 0.002
Pressure sensor
Y
Uncertainty of pressure [% FS]
130
-
Software specifications
-
Recording with third party software
N
Software name
SST SDA
Graphical presentation
Y
Raw data editing
Y
Re-computation with raw data
Y
CTD Probe controller
Y
-
Environmental
-
Max. depth [m]
6000
Max. pressure [bar]
600
Operating temperature: min. [Ā°C]
-10
Operating temperature: max. [Ā°C]
60
-
Data and connectivity
-
External recorder required
N
Internal memory
Y
Internal Memory [MB]
128
Direct data reading
Y
Connectors
RS232
Type of internal memory
non-volatile memory
Max. number of samples for self-recording [10^3]
4000000
Dedicated sub-surface data logger
Y
Dedicated surface data logger
Y
Telemetry link to remote location
Y
-
Power
-
Battery type
Alkaline / Lithium
Min. operating power [V]
10
Max. operating power [V]
15
Battery
Y
-
Additonal sensors
-
Standard sensor
pressure, temperature, conductivity
Description of additional sensors
dissolved oxygen, optical oxygen (SST-DO), pH, Redox, H2S, current meter, turbidity, fluorescense, PAR, transmissiometer, altimeter
No. of additional sensors
6
