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The OCEAN SEVEN 303 CTD multiparameter probe is the result of Idronaut's 25 years experience in the design and manufacturing of high-technology probes for scientific, research and groundwater monitoring applications. The 303 CTD multiparameter probe, which presents a diameter of only 43 mm, has been specifically designed for groundwater investigations through "Boreholes" and uses very reliable, accurate and drift free high quality sensors, associated with advanced and miniaturised electronics.
The OCEAN SEVEN 303 CTD multiparameter probe offers a combination of 16-bit high resolution data accuracy, with long-term sensor stability, making this probe the best choice for profiling applications. The 303 CTD multiparameter probe is equipped with the well-known and proven IDRONAUT pressure balanced full ocean depth, pump free and long-term stability sensors. Central to which, is the high accuracy seven-platinum-ring conductivity sensor, which can be cleaned in the field without the need for re-calibration. The 303 CTD multiparameter probe does not require pumps or any other external device to flush the sensors. The OCEAN SEVEN 303 CTD multiparameter probe continuously transmits acquired data converted into engineering units via FSK telemetry. Calibration coefficients and probe configuration are stored in the internal non-volatile memory. The 303 CTD multiparameter probe allows the operator to select the proper conductivity range: for salt or fresh water, making this probe a very advanced tool for investigation of groundwater influenced by salt water intrusion.
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SENSOR SPECIFICATIONS
The OCEAN SEVEN 303 CTD multiparameter probe can be equipped with the following sensors to measure:
| Parameter |
Range |
Accuracy |
Resolution |
Time Constant |
Pressure
Temperature
Conductivity
Salt water
Fresh water
Oxygen
pH
Redox |
0.. 1000 dbar(3)
-1.. +50 °C
0.. 64 mS/cm
0..6400 µS/cm
0.. 50 ppm
0.. 500 % sat.
0.. 14 pH
+/-1000 mVS/cm
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0.05 %full scale
0.005 °C
0.007 mS/cm
5 µS/cm
0.1 ppm
1 % sat.
0.01 pH
1 mV |
0.0015%full scale
0.001 oC
0.001 mS/cm
0.1 µS/cm
0.01 ppm
0.1 %sat.
0.001 pH
0.1 mV |
50 ms
50 ms
50 ms (1)
50 ms (1)
3 s (2)
3 s (2)
3 s
3 s |
(1) At 1 m/second flow rate.
(2) From nitrogen to air.
(3) Other standard pressure transducers available, have : 10, 40, 100, 200, 500, 2000 dbar ranges. |
In addition to pH and redox, another one of the following Ion Selective Electrodes can be installed for fresh water application and for 1000 m depth operation only:
Nitrate
Ammonia
Chloride |
0..100 mg/l-N
0..100 mg/l-N
0.5..18000 mg/l-N |
Sulphide
Iodide |
The fundamental properties of seawater, like:
Salinity, Fresh Water Conductivity corrected at 20°C and 25°C, 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".
IDRONAUT REDAS-5 Windows Software
REDAS-5 software, through a simplified and friendly operator interface, allows taking full control of the OCEAN SEVEN 303 CTD multiparameter probe and facilitates real-time data acquisitions. REDAS-5 programme is a true 32-bit Windows application, which flawlessly runs on Windows 2K and XP. REDAS-5 shows the acquired data graphically and numerically thus allowing the operator to dynamically change the graphical and numerical set-up during data acquisition. Post-processing functions and data extraction procedures, in function of time, pressure or numerical intervals can be applied to acquire data in real time. Among the operations that REDAS-5 can perform, it is worth mentioning: automatic start and stop of data acquisition; processing and filtering of acquired data in real time (time lag compensation, smoothing etc.); acquisition of geographical coordinates from a GPS device; acquired data conversion into text files; automatic scaling of the graphical window X and Y axis.
REDAS-5 software allows 8 and 12 Hz sampling rate. |
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TECHNOLOGY
IN SEARCH OF
NEW DEPTHS |
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| ELECTRONIC SPECIFICATIONS: |
Sampling rate:
Communication:
Baud Rate:
Protocol:
A/D converter:
Supply Voltage:
Supply Current:
Cable: |
8 Hz (conversion into engineering units takes place using the probe internal resources); 12 Hz using REDAS software;.
FSK Telemetry, RS232C, Asynchronous TTL (0..5VDC).
9600 bps.
[Verbose] friendly operator interface with built-in help.
[Non Verbose] binary and/or ASCII data transmission.
16-bit, resolution, range 0..2.5 VDC, 12 multiplexed analogue inputs.
9..30 VDC, nominal 12 VDC.
50 mA @ 12 V DC.
The OCEAN SEVEN 303 CTD multiparameter probe operates with the standard Rochester coaxial armoured cables (1/10, 1/8, 1/4, inch) and with sea cable having a total resistance up to 250 ohms. |
| PHYSICAL CHARACTERISTICS: |
| Housing: |
AISI 316L |
1500 dbar |
Dimensions:
Weight: |
housing diameter
total length
in air
in water
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43mm
670mm
1.6 kg
0.8 kg |
TELEMETRY PORTABLE DECK UNIT
The Telemetry Portable Deck Unit powers and interfaces, by coaxial oceanographic cables, the Ocean Seven 303 CTD with a personal computer. The portable deck unit is equipped with a transceiver (modem) which allows half-duplex communication with the probe.The portable deck unit is housed in a waterproof plastic case and is provided with an internal mains rechargeable lead battery (12V DC, 7 A/h) which permits probe operation even in the absence of the mains supply . The internal battery guarantees up to 20 hours of continuous probe and deck unit operation. The portable deck unit comes complete with an international battery charger: 115/220VAC +/-10%, 50-60 Hz +/-5%
Telemetry power supply: 30V DC (max 0.3A@12 V).
Dimensions: 340 x 300 x 160 mm. Weight: 6.5 kg.
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