Ocean Seven 304 Plus CTD LOGGER

Ocean Seven 304 Plus CTD LOGGER

VERY LOW POWER, SELF-RECORDING, UV ANTFOULING, DISSOLVED OXYGEN, pH, ARCTICA, ANTARCTICA - BRINE - ROVs and AUVs

Product literature - Brochure

FEATURES:
- Up to 8 Hz CTD simultaneous sampling.
- Very low power consumption.
- Expandable: pH, O2, Turbidity and other sensor interfaces, available upon request..
- Large memory (2GByte) 60.000.000 data sets.
- High-speed data uploading.
The OCEAN SEVEN 304Plus CTD completes the line of high quality and accuracy IDRONAUT OCEAN SEVEN CTDs, fulfilling the demand of a high performance CTD probe with very small diameter and very low power consumption. This CTD can be easily integrated/adapted to third-party systems like floating profilers and/or oceanographic moorings, ROVs and AUVs. IDRONAUT prides itself on the design of its full ocean depth, pump-free, low-maintenance sensors. Central to which is the high accuracy seven-platinum-ring quartz conductivity
cell (patented) which can be cleaned in the field without the need for re-calibration. This unique quartz cell employs a large diameter (8 mm) and a short length (46mm) to guarantee self-flushing.
The OS304Plus does not require pumps or any other external device to flush the sensors, which minimizes its power consumption and allows the use in Arctica and Antarctica. The OS304Plus CTD standard interface is RS232C; other optional interfaces are: TTL and wireless Bluetooth®.
The OS304Plus communicates at a speed up to 115k2 bps, thus reducing data uploading time to a minimum. The OS304Plus can be manufactured with a 316 grade L stainless steel housing or a white POM housing or a titanium housing allowing deployment to depths of 1000 dbar or 2000 dbar or 7000 dbar respectively.


SAMPLING MODES

Continuous: Sampling at configurable rate: 0.1 Hz to 6 Hz. Multiple cycles can be obtained by switching the CTD on/off.
Pressure: Data is sampled at pressure intervals. Multiple profiles are obtained by switching the CTD on/off.
Timed: CTD collects a series of samples and then sleeps for the configured time interval. Time intervals are: between 5s and 1 day.
Conditional: Data acquisition is started and continues while the reading from a selected sensor is above a threshold value. Monitoring of the selected sensor threshold value can be configured to occur at intervals: between 5s and 1 day.
Burst: Burst sampling carried out at configured time intervals: between 5s and 1 day.

UV ANTIFOULING
A UV-LED (Ultraviolet, 250..300 nm @500μW, Light-Emitting Diode) is integrated into the conductivity sensor quartz cell (patent pending). The UV-LED sterilizes the early growth of biofouling, thus eliminating environmental drift in the conductivity sensor.

TOP-COVER BULK-HEAD CONNECTOR
The OCEAN SEVEN 304Plus is equipped with the MCBH series of wet-pluggable connector.

DATA STORAGE AND BATTERY ENDURANCE
The OS304Plus CTD is equipped with a 2-Gbyte internal non-volatile FLASH memory which allows the storing of about 60,000,000 data sets each one being composed of the reading of: CTD sensors plus the acquisition date and time.
Different types of battery can be installed in the CTD housing.

- 2 x size "AA" Alkaline 1.5V battery assembled in a single pack.        3.0V   

- 1 x size "AA" Lithium non rechargeable battery                                          3.6V, 2.4Ah
- 1 x size “C”   Lithium non rechargeable battery                                          3.6V, 8.4Ah
- NiMH rechargeable IDRONAUT custom battery pack (3x1.2 AA)                  3.6V, 2.6Ah

The NiMh rechargeable battery pack allows up to 50 hours of continuous operation, while the "C" size Lithium non rechargeable battery allows up to 168 hours of continuous operation. Whenever the OS304Plus operates in Timed, Burst and Conditional modes, the battery endurance is considerably extended because the OS304Plus enters a deep sleep mode between acquisitions and drains only 8µAh from the battery.
For instance, by monitoring every hour, the OS304Plus will run, in theory, for 12 years on a single Lithium size “C” cell.




TECHNOLOGY
IN SEARCH OF
NEW DEPTHS
 

SENSOR SPECIFICATIONS
The OS 304Plus CTD can be equipped with the following sensors to measure:

The fundamental properties of seawater, like:
Salinity, Sound Speed, Water Density, Oxygen ppm are obtained using the algorithms described in the UNESCO technical papers in marine science no. 44 "Algorithms for computation of fundamental properties of sea water".

The freshwater properties like:
TDS (Total Dissolved Solids), Fresh Water Conductivity corrected at 20°C and 25°C are automatically calculated.


OPTIONAL SENSOR SPECIFICATIONS
The OS 304Plus CTD can be optionally equipped with the IDRONAUT Highly Accurate Precise (0.01%FS) pressure transducer, the IDRONAUT OEM Turbidity Meter, the IDONAUT dissolved oxygen sensor and the IDRONAUT pH sensor.


ELECTRONIC SPECIFICATIONS:
Real-time and logging:
Interfaces:
Real time clock accuracy:
Communication speed:
Data memory:
Supply voltage:
       Battery:

       External
:
Supply current:
       Running:
       Sleep
:
8 Hz.
RS232C, TTL (0..3.3VDC), wireless Bluetooth®.
3 ppm/year.
38K4 bps (up to 115k2 bps).
2 GBytes
.

2x size "AA" Alkaline 1.5V battery assembled in a single pack, 3.0V.
1x size "AA" Lithium not rechargeable battery, 3.6V, 2.4Ah.
5.0..18 VDC.

45 mA @ 3.6V.
8
µA @ 3.6V.

 

 

 

 

 

SOFTWARE
Idronaut programmes operating under all Windows versions allow the operator to configure the OS304Plus data acquisition and logger functions and upload data from the memory. They are:


ITERM: Terminal emulation programme to easily communicate with the OS04Plus using the built-in operator interface and communication protocol.
REDAS: Data processing and retrieval programme, which allows the display and plotting of conductivity, temperature, pressure and derived variables such as salinity, sound speed and water density, according to UNESCO formulas and recommendations.
µREDAS: REDAS-5 customized for Windows mobiles running on PDA devices.

 

 

 

 

 

PHYSICAL CHARACTERISTICS:

Housing:                                       1000 dbar                          
2000 dbar            7000 dbar
                                             (AISI 316/black POM)            
(white POM)       (Titanium GR2)

Dimensions:
      housing diameter                         
43 mm(upper cap: 48 mm)        75 mm                 48 mm
      total length                                 540 mm                                580 mm               545 mm
Weight:                                            
      in air                                            1.1 kg                                   2.2 kg                   1.8 kg
      in water                                     0.65 kg                                    0,5 kg                   1.1 kg

 

 

It is also available a shorter AUV version(total length 435 mm for 1000 and 7000 dbar). Please contact Idronaut for further information.