CTD90M

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

General

Power

Battery type

Alkaline / Lithium
Min. operating power [V]

10
Max. operating power [V]

15
Battery

Y

Environmental

Max. depth [m]

6000
Max. pressure [bar]

600
Operating temperature: min. [°C]

-10
Operating temperature: max. [°C]

60

Pressure, temperature and conductivity sensor

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

Observations

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

Additonal sensors

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