Standard parameters include Conductivity, Temperature and Depth. Optional Sensors available include Turbidity, OBS, pH, Dissolved Oxygen, Redox and Sound Velocity.
Up to 20M bytes of internal memory are available for data storage, allowing storage of 3 million C, T, and D data samples. All communication, programming and data retrieval are accomplished without opening the instrument housing via a four-pin waterproof connector.
The CTD/S4 may be programmed for logging to internal memory or for external, real-time logging. In addition, the operating mode may be programmed to vary such characteristics as channels recorded, sampling rate, and recording interval.
Communication with the CTD/S4 is via a standard RS232C serial link interface. The Baud-rate can be set from 300 Baud to 19,200 Baud. The scan rate for fast profiling is 10 samples per second. Data may be sent over cable 1,000 meters in length for real-time logging. Real-time logging may be accomplished using a four-conductor shielded cable.
CTD/S4 Specifications
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|
| Controller |
|
| Type: |
CMOS Microprocessor |
| Timekeeping: |
Quartz oscillator, 12 minutes per year accuracy, non-restricted LIthium battery, five years life. |
| Memory: |
CMOS Static RAM (with 5 year battery backup) or non-volatile Flash RAM; 64K Bytes standard (256K, 512K, 1M, or 20M Bytes optional), with capacity of 3 million C, T, and D data samples with 20M memory. |
| Mechanical |
|
| Size: |
25 cm (10 in) diameter sphere |
| Weight: |
11 kg (24 lbs) in air, 1.5 kg (4 lbs) in water |
| Material: |
Fiberglass reinforced cycloaliphalic epoxy resin; Titanium; 316 SS |
| Operating Temperature: |
-5 to + 45 deg. C |
| Storage Temperature: |
-40 to + 70 deg. C |
| Operating Depth: |
1,000 m (6,000 m optional) |
| Power Supply |
|
| Internal: |
Six "D" cell Alkaline or Lithium batteries |
| External: |
9 to 12 VDC, 90 mA max (with all options) |
|
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|
Standard Sensors
|
| Conductivity |
| Type: |
Inductive |
| Range: |
1.0 to 70 mS |
| Resolution: |
0.005 mS |
| Precision: |
+/- 0.02mS |
| Time Constant: |
< 0.06 sec. |
| Temperature |
| Type: |
Platinum |
| Range: |
-5 to + 45 deg. C |
| Resolution: |
0.003 deg. C |
| Precision: |
+/- 0.02 deg. C |
| Time Constant: |
< 0.06 sec. |
| Depth |
| Type: |
Semiconductor |
| Range: |
0-1000 dBar
(70 M Optional) |
| Resolution: |
0.06 dBar
(4 mm with 70 M) |
| Precision: |
+/- 0.15 % full scale |
| Time Constant: |
< 0.06 sec. |
|
|
Calculated Parameters:
Salinity, Density, Sound Velocity |
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Optional Sensors
|
| Dissolved Oxygen |
| Type: |
Polarographic |
| Range: |
0-20 ppm |
| Resolution: |
0.002 ppm |
| Precision: |
+/- 0.1 ppm |
| Time Constant: |
5-10 sec. |
| Sound Velocity |
| Type: |
Sing-around |
| Range: |
1,200-1,600 m/sec |
| Resolution: |
0.01 m/sec |
| Precision: |
+/- 0.05 m/sec |
| Time Constant: |
0.02 sec. |
| Redox |
| Type: |
Platinum Electrode |
| Range: |
-400 to +400 mV |
| Resolution: |
0.05 mV |
| Precision: |
+/- 0.1 mV |
| Time Constant: |
0.05 sec. |
| pH |
| Type: |
Combination Electrode |
| Range: |
2-12 |
| Resolution: |
0.001 |
| Precision: |
+/- 0.05 |
| Time Constant: |
0.05 sec. |
| Turbidity |
| Type: |
Transmissometer |
| Range: |
Transmissivity 0-100%
(0-200 JTU) |
| Resolution: |
0.01% full scale |
| Precision: |
+/- 2% full scale |
| Time Constant: |
0.05 sec. |
| Suspended Solids |
| Type: |
OBS |
| Range: |
0 - 100 FTU
(Options to 2000 FTU) |
| Resolution: |
0.01 FTU |
| Precision: |
+/- 2% full scale |
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