CTD 48 Mc

CTD 48 Mc

The CTD48Mc is a high quality, high accuracy memory probe for oceanographic and limnological measurement of conductivity, temperature, depth and with one optional parameter for depth up to 2000 m.

The CTD48Mc is characterised in particular by its ability to directly output physical and calculated data such as salinity, sound velocity and density.

Standard models:
CTD48Mc:
Online and memory probe for measurement of conductivity, pressure, temperature + 1 optional sensor

Standard sensors:

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

Additional sensors:

  • Oxygen
  • Turbidity
  • pH
  • Redox (OPR)
  • Flourometer

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SKU: 00002281 Category:

Description

Multiparameter probe CTD 48Mc

The CTD48Mc probe is a very small and handy microprocessor controlled multiparameter memory probe for precise measurements as well as for self-contained operation in deep and shallow water with up to 4 sensors and a maximum depth down to 2000 m. It measures conductivity, temperature, pressure and one optional parameter.
The difference between the CTD48Mc and the previous version of CTD48 Probe are:

  • low weight
  • powerful micro controller
  • calibration coefficients stored inside the probe
  • output of calculated / physical data
  • powerful interfaces
  • rechargeable batteries (NO opening of the probe!)

The CTD48Mc can work in different modes. One mode is standard SST mode, as with all previous SST probes. In this mode, the data can be read, graphed and saved via an SST programme.
In another mode, physical and calculated data, such as salinity, density or speed of sound, can be readout directly as readable characters (ASCII).
The probe can be operated in the following environments:

Online operation
During measurements, the probe must be connected by a cable to a device for displaying and recording measured values. The PC with the “SDA” software application represents the device for displaying and recording measured values in this case. The probe transmits the measured values to this connected data acquisition unit, i.e. the probe does not store any measurement data in its internal data memory. Power is supplied by the internal battery or from an external source.

The online operation is implemented by the following operation mode:

  • RS-232 (factory default)
  • USB UART (factory default – for configuration and memory readout)

Memory operation
The probe can perform measurements automatically and save measurement results internally. Using a configuration cable, a software application transmits to the probe from a PC the settings that control the probe in memory operation. During the actual measurement, no connection is required between the probe and the control unit. In memory operation, the electrical supply is gener¬ally provided by the internal batteries; alternatively, power supply via a connection cable is possible. After measurement, the internally stored measured values are transmitted to a device for storage and display. In this case, the PC running the “SDA” software application is the device con¬figuring the probe and displaying and storing the measured values. The probe can also transfer the currently measured values to a device for display or storage during memory operation and using a connecting cable.

The memory operation is divided into the following operation 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 stamps.

The CTD48Mc is equipped with an 8 channel data acquisition system with 20 bit resolution. High long-term stability and automatic self-calibration of analogue digital converter guarantee stable and precise CTD measurements for many years.

The probe power supply of the 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.

Standard models:
CTD48Mc:
Online and memory probe for measurement of conductivity, pressure, temperature + 1 optional sensor

Standard sensors:

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

Additional sensors:

  • Oxygen
  • Turbidity
  • pH
  • Redox (OPR)
  • Flourometer

Calculated parameters:

  • salinity
  • sound velocity
  • Kappa 25 mS/cm (electric conductivity)
  • sigma – t (potential density of a fluid)
ten year warranty

Additional information

Max. Depth

up to 50 m, up to 100 m, up to 200 m, up to 500 m, up to 1000 m, up to 2000 m, up to 4000 m, up to 6000 m

Field of Application

Brackwater, Drinking water, Ground water, Fresh water, Salt water, Offshore

Measuring mode

Memory, Online

Special functions

borehole probe, Ethernet for ROV / AUV, inductive modem, internal calculation, rechargeable batteries, wireless data transfer

Conductivity

0 – 70 ms/cm, 0 – 300 ms/cm

Temperature PT100

From -2 – 36°C, From -2 – 60 °C

pH

H2S resistant, Standard

Redox

H2S resistant, standard

Oxygen

CLARK, Optical

Turbidity

0 – 25 ftu/ntu, 0 – 125 ftu/ntu, 0 – 500 ftu/ntu, 0 – 4000 ftu/ntu

Fluorometer

CDOM/FDOM, Chlorophyll A, Crude Oil, Fluorescein, Optical Brighteners, Phycocyanin, Phycoerythrin, PTSA, Refined Fuels, Rhodamine, Tryptophan

Special sensors

Bottom indicator, Compass, H2S, Inductive conductivity, Temperature NTC

The probe can be operated in two different data transmission modes.

Rawdata mode

In this data transmission mode, the probe continuously determines the measured values of the individual sensors through an analog-to-digital conversion. The probe stores the data as the readings of the analog-to-digital conversions. The probe continuously generates raw data sets from the counter readings of the analog-digital conversions and some internal management data. The probe transmits the raw data sets over a binary data protocol to a unit for data display or data storage.

The transformation of raw data into physical quantities is carried out in the software application “SDA” after they have been transferred. The SDA software calculates the physical quantities from the raw data values and associated calibration coefficients. The calibration coefficients were previously determined in a calibration at Sea & Sun Technology GmbH and stored in the configuration files of the SDA software. Thus, only the system consisting of probe and SDA software along with associated configuration files results in a complete measurement system for physical quantities.

Physical data mode

In this data transmission mode, the CTD48Mc determines the measured values of the individual sensors through an analog-to-digital conversion. The probe stores the readings as a binary result of the analog-to-digital conversions. The probe receives the calibration coefficients before the actual measurement. The probe transmits the physical quantities via an ASCII protocol according to the NMEA standard to a unit for data display or data storage. The protocol to NMEA requires that the physical units are fixed. This data transmission mode is one of the feature enhancements of CTD48Mc compared to the previous version CTD48M. The letter “c” in “CTD48Mc” stands for “calculated”.

  • Power: 9…30V DC
  • Power consumption: approx. 0,5 W (sensor-dependent) 
  • Serial port: RS-232 or RS-485 (optional FSK)
  • Data transmission : 5 CTD sets/s
  • Connector: SUBCONN MCBH8M Ti

Material:

  • Housing: titanium, grade 2 (bis 2000m)
  • Connector: titanium, neoprene

Dimensions and Weights

  • Length (housing): 310 mm
  • Length (protection frame): 130 mm
  • Length (overall with connector): app. 530 mm
  • Diameter (housing): 48 mm
  • Weight (in air): approx. 1.2 kg
  • Robust plastic case
  • CTD48Mc
  • Probe user manual
  • Software manual SST-SDA
  • Calibration documents
  • Software
  • Batteries
  • Hexagon key with t-shaped plastic handle
  • Shackle
  • Dummy cap with locking sleeve
  • Configuration cable (5m)
  • USB cable
  • Magnetic rod
  • RS232 to USB converter
  • O-rings
  • Titanium screws
  • Silicon grease
  • Quick start guide

We offer calibration of several probes and sensors

  • Pressure (dead weight tester)
  • Temperature: Millikelvin Thermometer Pt 100 (ITS 90, IEC 751)
  • Conductivity: Salinometer, Guildline Autosal 8400B / Portasal 8410A (standard sea water)
  • pH / Redox (buffer solutions)
  • Oxygen