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Sea & Sun Technology GmbH CTD48M

Online and memory probe

CTD48M is a very small multiparameter probe for precise measurements of pressure, temperature, conductivity and one optional parameter up to 6000 m.

Standard sensors:

Conductivity (С)
Temperature (T)
Pressure (D)

Additional sensors:

Dissolved Oxygen
Turbidity
pH
Redox (OPR)

  • Sea & Sun Technology GmbH CTD48M
Sea & Sun Technology GmbH
Arndtstrasse 9-13
24610 Trappenkamp
Germany
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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 are stored in a standard flash memory card with a capacity limited to 8 Mbytes by the internal firmware. Up to 350.000 CTD data sets can be recorded on this memory.

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 power supply is activated by touching a reed contact with a magnetic rod. LED displays power supply status and optical control of memory access.
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

  • Weight in air [kg]
    1.2
  • Diameter [mm]
    48
  • Length [mm]
    240
  • Housing material
    Titanium
  • Max. cable length [m]
    6000
  • Min. operating power [V]
    9
  • Max. operating power [V]
    30
  • Max. depth [m]
    6000
  • Max. pressure [bar]
    600
  • Pressure sensor
    Y
  • Type of pressure sensor
    piezo resistive
  • Resolution of pressure [% FS]
    0.002
  • Accuracy of pressure sensor
    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]
    0.002
  • Accuracy of temperature measurement
    0.05
  • Conductivity sensor
    Y
  • Type of conductivity sensor
    7-pole-cell
  • Max. conductivity [S/m]
    70
  • Resolution of conductivity [10^-3 S/m]
    0.0005
  • Accuracy of conductivity measurement
    ± 0.002
  • Standard sensor
    pressure, temperature, conductivity
  • No. of additional sensors
    1
  • Description of additional sensors
    dissolved oxygen, pH, Redox (ORP), turbidity, H2S
  • Internal memory
    Y
  • Internal Memory [MB]
    8
  • Max. number of samples for self-recording [10^3]
    400000

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