CTD 48M

The CTD48M is a high quality, high accuracy 4 channel probe for oceanographic and limnologic measurement of conductivity, depth and temperature up to 2000 m. SST´s CTD48M runs from an internal battery and records data at programmable time intervals or pressure stamps in a non volatile FLASH memory with a capacity of 8 Mbytes. A standard RS-232 inter-face is used for programming and data extraction. The supplied Standard Data Acquisition Software package “SST-SDA” for Win® 95 to XP includes the handling of the logging process and the display of online or recorded data with a shared graphic user interface.

The CTD48 allows the simultaneous measurement of 4 of the following parameters:

  • Pressure (depth)
  • Temperature
  • Conductivity
  • as additional option: fast response dissolved oxygen (max. depth: 100m)

Online capability

  • 5 CTD datasets/s
  • 4 CTDO2 datasetes/s

Main Features

  • low weight
  • easy handling
  • max. 4 internal sensors
  • corrosions free housing
  • depth range up to 500m
  • SDA data aquisition software running under Windows 95/98/Me/2000/XP
  • calculations according to UNESCO formulas

Materials

  • Housing: Titanium
  • Connector: Titanium, Neopren

Dimensions and Weights

  • L (housing) app. 215 mm
  • Ø (housing) 48 mm
  • L (overall) app. 400 mm
  • W (in air) app. 1,2 kg

 Recording modes
Continuous mode
Each data set is stored.

Time mode
Data sets are stored only at programmable intervals with several selectable schemes.

Pressure mode
Data sets are stored at programmable depth stamps. More than 100 casts can be stored at profiling and continuous mode as long as the flash-memory or battery capacity is sufficient. The start of a cast is possible using a magnet, the probe must not be connected to a computer. Up to 400000 CTD data sets can be recorded, the actual number depends an the selected storage options and the number of sensors adapted to the probe.

Battery is not rechargeable!

Installed battery: alkali baby cell size C sufficient for data storage during 150 hours operation in the continuous mode. Battery lifetime in the time mode depends on the selected measuring intervals. Lithium cell size C on request.

The probe is equipped with a precision microprocessor-controlled 4 channel 16 bit analogue to digital converter. Data is available as RS-232 signal (multi-conductor sea-cable) to a PC.
The probe can be powered by battery or DC-power supply (6 to 18 Volt) when using RS-232 output.