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Sea & Sun Technology 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 CTD90M
Sea & Sun Technology
Arndtstrasse 9-13
24610 Trappenkamp
Germany
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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 (С)
  • 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

  • Year of initial development
    2007
  • Weight in air [kg]
    6
  • Diameter [mm]
    90
  • Length [mm]
    600
  • Max. cable length [m]
    6000
  • Housing Material
    Titanium
  • Battery type
    Alkaline / Lithium
  • Min. operating power [V]
    10
  • Max. operating power [V]
    15
  • Battery
    Y
  • Max. depth [m]
    6000
  • Max. pressure [bar]
    600
  • Operating temperature: min. [°C]
    -10
  • Operating temperature: max. [°C]
    60
  • Max. conductivity [S/m]
    70
  • Resolution of conductivity [10^-3 S/m]
    0.0005
  • Min. temperature [°C]
    -2
  • Max. temperature [°C]
    36
  • Resolution of temperature [°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
    ± 0.002
  • Conductivity sensor
    Y
  • Type of conductivity sensor
    7-pole-cell
  • Accuracy of conductivity measurement
    ± 0.002
  • Pressure sensor
    Y
  • Uncertainty of pressure [% FS]
    130
  • 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
  • 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
  • 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
  • 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
  • Data display on dedicated hardware
    N
  • Method of first recording
    internal /external
  • Display of analogue data
    Y

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