|
|
|
Model 303 Borehole Probe
|
|
ADVANCED SENSORS AND
DEVICES FOR BOREHOLE PROFILING AND MONITORING |
|
|
The OCEAN SEVEN 303
CTD multiparameter probe is the result of Idronaut's 20 years experience
in the design and manufacture of high-technology probes for scientific,
research and borehole monitoring applications. The 303 CTD multiparameter
probe, which has an outside diameter of only 43 mm, has been specifically
designed for borehole application 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 an ideal choice for profiling applications. Idronaut
prides itself on the design of its pressure balanced full ocean depth,
pump free, low maintenance sensors. Central to which, is their well known
high accuracy seven-platinum-ring conductivity sensor, which can be
cleaned in the field without need of 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:
telemetry or RS232C. 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 borehole monitoring applications.
Download Specification Sheet
303BoreHoleProbe.pdf
The OCEAN SEVEN 303 CTD multiparameter probe can be equipped with the
following sensors to measure: |
|
SENSOR SPECIFICATIONS |
|
Parameter Range |
 |
Accuracy |
|
Resolution |
|
Time
Constant |
|
Pressure |
0.. 1000 |
dbar(3) |
0.05 |
% F.S. |
0.0015 |
% F.S. |
50 |
ms |
|
Temperature |
-1.. +50 |
°C |
0.005 |
°C |
0.001 |
°C |
50 |
ms |
|
Conductivity |
|
|
|
|
|
|
|
|
|
Salt water 0.. 64 |
mS/cm |
0.005 |
mS/cm |
0.001 |
mS/cm |
50 |
ms(1) |
|
Fresh water 0.. 6400 |
µS/cm |
1 |
µS/cm |
0.1 |
µS/cm |
50 |
ms(1) |
|
Oxygen |
0.. 50 |
ppm |
0.1 |
ppm |
0.01 |
ppm |
3 |
s(2) |
|
|
0.. 500 |
% sat.
|
1 |
% sat. |
0.1 |
% sat. |
3 |
s |
|
pH |
0.. 14 |
pH |
0.01 |
pH |
0.001 |
pH |
3 |
s |
|
Redox |
-/+1000 |
mV |
1 |
mV |
0.1 |
mV |
3 |
s |
|
no. 3
analogue inputs for: |
|
Ammonia |
0..
100 |
mg/l-N |
|
|
0.1 |
mV |
|
|
|
|
|
|
Nitrate |
0..
100 |
mg/l-N |
|
|
0.1 |
mV |
|
|
|
|
|
|
Chloride |
0.5..
18000 |
mg/l-N |
|
|
0.1 |
mV |
|
|
|
|
|
(1) At 1 m/second flow rate.
(2) In air.
(3) Other
standard pressure transducers, available, have
10,40,100,200,500,2000,4000,6000 dbar ranges.
|
The following parameters are calculated from CTD sensor signals:
>
SALINITY (according to UNESCO 1978 formula);
>
FRESH WATER
CONDUCTIVITY corrected at 20 °C;
>
OXYGEN % SATURATION to OXYGEN ppm
CONVERSION
(according to UNESCO 1986 formula - Millero);
IDRONAUT REDAS Windows Software
The REDAS (REmote DAta Software) software has
been designed for real-time acquisition process and its graphic
facilities are extremely useful. It is a true Windows software,
allowing changing of the graph parameters, printing of the current
plot, display and printout of sample information during
acquisition. It automatically manages the beginning and the end of
a cast, bottle sampling, the selected alarms and the acquisition
of cruise information through a geographical positioning system
(GPS). The user can manage probe deployment without needing to
trigger the acquisition software at the same time. During a cast,
other users can look at the plots, print them or define the
sampling depths in advance. Acquisition stops automatically when
the probe is on board.
|
|
|
|
ELECTRONIC SPECIFICATIONS |
|
|
|
Sampling
frequency |
|
40 Hz
|
|
Direct
readout |
up to 20 Hz
using REDAS software and fast binary communications;
2 Hz (conversion into engineering units takes place using the probe
internal resources). |
|
Communication |
Telemetry,
RS232C, Asynchronous TTL (0..5VDC). |
|
Baud Rate |
9600 bps. |
|
Protocol |
[Verbose]
friendly operator interface with built-in help.
[Non Verbose] Binary and/or ASCII data transmission.
|
|
A/D converter |
16-bit
successive approximation, resolution 38 µV/bit range 0..2.5 VDC.
|
|
Analogue input |
12 multiplexed
analogue inputs |
|
Supply Voltage |
9..30 VDC,
nominal 12 VDC |
|
Supply Current
|
30 mA @ 12 V
DC |
|
Cable |
The OCEAN
SEVEN 303 CTD multiparameter probe operates with standard Rochester
coaxial armoured cables (1/10, 1/8,
1/4, 1/2 inch), and with
sea cable having a total resistance up to 250 ohms. |
|
|
PHYSICAL CHARACTERISTICS
|
|
|
|
Housing:
AISI
316 |
|
1500 dbar
|
|
6000 dbar
|
|
Dimensions:
housing diameter (*) |
43 mm |
48 mm |
|
total
length |
670 mm |
670 mm |
|
Weight:
in air |
1.6 kg |
3.7 kg
|
|
in water |
0.8 kg |
2.8 kg
|
|
|
(*) The removable
titanium sensor protection presents a diameter of 44 mm. |
|
|
