CTD 75M

CTD 75M

The CTD75M probe is a medium sized microprocessor controlled multi-parameter probe for limnological measurement of physical, chemical and optical parameters with up to 8 sensors for depth up to 1000 m. It measures conductivity, temperature, and pressure as a standard configuration. Furthermore, it can be easily configured for a wider range of auxiliary sensors.

Standard models:
CTD75M:
Online and memory probe for measurement of conductivity, pressure, temperature + 4 optional sensors

Standard sensors:

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

Additional sensors:

  • Oxygen
  • Turbidity
  • pH
  • Redox (OPR)
  • Fluorometer
  • Light irradiance
  • Transmissiometer

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SKU: 30400002 Category:

Description

Multiparameter probe CTD 75M

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 CTD75M 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 CTD75M is equipped with a 4 channel data acquisition 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 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.

Standard models:
CTD75M:
Online and memory probe for measurement of conductivity, pressure, temperature + 4 optional sensors

Standard sensors:

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

Additional sensors:

  • Oxygen
  • Turbidity
  • pH
  • Redox (OPR)
  • Fluorometer
  • Light irradiance
  • Transmissiometer

Calculated parameters:

  • salinity
  • sound velocity
  • Kappa 25 mS/cm
  • sigma

Main Features:

  • low weight
  • easy handling
  • up to 8 sensors on the bottom cap
  • non-corrosive titanium housing (titanium)
  • depth range up to 1000 m
  • SDA data acquisition software running under various versions of Microsoft Windows
    (a part of the shipment)
  • calculations according to UNESCO formulas
ten year warranty

Additional information

Max. Depth

up to 100 m, up to 1000 m, up to 200 m, up to 50 m, up to 500 m

Field of Application

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

Measuring mode

Memory, Online

Special functions
Conductivity

0 – 10 ms/cm, 0 – 300 ms/cm, 0 – 70 ms/cm

Temperature PT100

From -2 – 36°C, From -2 – 60 °C

pH

H2S resistant, Standard

Redox

H2S resistant, standard

Turbidity

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

Fluorometer

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

Oxygen

CLARK, Optical

Light irradiance

BI QCP2300, BI QSP2200, Li-Cor 192SA, Li_Cor 193SA, Satlantic PAR

Special sensors

CO2, H2S, Transmission

The data transfer and the power supply of the probes over longer cables (up to 1000 m) is carried out when using multi-conductor cables (at least 4-wire) via a serial interface (RS-485).

For shorter cable lengths (up to 500 m) the R-S232 interface can be used. It is also used to configure and readout the data memory.

If the probe is equipped with a USB interface, it is recommended to read the stored data via this interface, since a shorter read-out time can be achieved. The cable length of the USB interface should not be longer than 5 m.

The probes are provided with a program (SDA) for the configuration, readout of stored data, numerical and graphical representation of the data and storage of data for all probes in online or memory mode.

  • Power: 7…15V DC
  • Power consumption: approx. 0,5 W (sensor-dependent) mA
  • Serial port: RS-232
  • Port specifications : 2400,o,8,1
  • Data transmission : 5 CTD sets/s
  • Connector: SUBCONN MCBH8MTi

Material:

  • Housing: titanium, grade 2
  • Connector: titanium, neoprene

Dimensions and Weights

  • Length (housing): 360 mm
  • Length (protection frame): 294 mm
  • Length (overall with connector): approx. 654 mm
  • Diameter (housing): 73 mm
  • Weight (in air): approx. 3.5 kg
  • Robust plastic case
  • CTD75M
  • 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
  • RS-232 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