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Print version
Current manual - RS-232,
RS-485,
SDI-12 (for older manuals,
click here)
Reference Sheet -
RS-232,
RS-485,
SDI-12
Configuration options & accessories
|
Optional plastic (ShallowCAT) housing; standard titanium housing also available. |
SUMMARY
DESCRIPTION
The SBE 37-SMP-ODO MicroCAT is a high-accuracy conductivity and temperature (pressure optional) recorder with Serial interface, internal batteries, Memory, integral Pump, and Optical Dissolved Oxygen sensor. Constructed of titanium and other non-corroding materials for long life with minimal maintenance, the MicroCAT is designed for moorings or other long duration, fixed-site deployments.
Calibration coefficients are stored in EEPROM, allowing output of C, T, P, DO, and time in ASCII engineering units (decimal or XML; raw output available); salinity, sound velocity, and specific conductivity can also be output.
SENSORS
Conductivity and Temperature sensors are based on our field-proven SeaCAT and SeaCATplus products. Electrical isolation of conductivity electronics eliminates any possibility of ground-loop noise. Our unique internal-field conductivity cell permits the use of expendable anti-foulant devices, for long-term bio-fouling protection. The aged and pressure-protected thermistor has a long history of exceptional accuracy and stability.
The oxygen sensor is our field-proven SBE 63 Optical Dissolved Oxygen sensor.
The optional strain-gauge pressure sensor is available in eight ranges, from 0 - 20 meters to 0 - 7000 meters. Compensation of the temperature influence on pressure is performed by the MicroCAT’s CPU.
PUMP
The integral pump runs each time the MicroCAT samples, providing the following advantages:
With Adaptive Pump Control, the MicroCAT calculates the pumping time for best oxygen accuracy as a function of the previous sample's temperature and pressure (maximizing data quality while minimizing power consumption).
COMMUNICATIONS AND INTERFACING
The MicroCAT communicates via standard RS-232 interface. Data can be uploaded at up to 115.2K baud; real-time data can be transmitted up to 400 meters at 2400 baud, simultaneous with recording. The user can upgrade firmware through the external connector, without opening the housing. There are two optional interfaces:
User-selectable operating modes include:
SOFTWARE
The MicroCAT is supplied with a powerful Windows 2000/XP software package, Seasoft© V2, which includes:
DATA STORAGE AND BATTERY ENDURANCE
Temperature and conductivity are stored 6 bytes/sample, time 4 bytes/sample, oxygen 6 bytes/sample, and optional pressure 5 bytes/sample; memory capacity exceeds 380,000 samples (with pressure). The MicroCAT is powered by a 7.8 Amp-hour (nominal) battery pack with twelve AA lithium batteries (Saft LS14500) which, when removed from the MicroCAT, can be shipped via commercial aircraft. Battery endurance varies widely, depending on the sampling scheme and deployment pressure and temperature. Sampling every 10 minutes in water temperatures of approximately 10 C, the MicroCAT can be deployed for almost 6 months (24,000 samples); see the manuals for example calculations.
SPECIFICATIONS
|
Measurement Range |
Initial Accuracy |
Typical Stability |
Resolution | |
| Conductivity |
0
to 7 S/m (0 to 70 mS/cm) |
0.0003 S/m (0.003 mS/cm) |
0.0003 S/m (0.003 mS/cm) per month |
0.00001 S/m (0.0001 mS/cm) |
|
Temperature (°C) |
-5 to 35 | 0.002 | 0.0002 per month | 0.0001 |
| Optional Pressure |
20 / 100 / 350 /
600 /
1000 / 2000 / 3500 / 7000 m (meters of deployment depth capability) |
0.1% of full scale range | 0.05% of full scale range per year | 0.002% of full scale range |
| Oxygen |
120% of surface saturation in
all natural waters (fresh and salt) |
larger of
±3 µmol/kg
(equivalent to 0.07 ml/L or 0.1 mg/L) or ±2% |
sample-based
drift < 1 µmol/kg/100,000 samples (20 °C) |
0.2 µmol/kg |
Clock Stability: 5 seconds/month
Acquisition Time: 2.4 - 3.2 seconds/sample, dependent on sampling mode and inclusion of pressure sensor (see manual)
Power Supply: 7.8 Amp-hour (nominal) battery pack, 257 KJoules (derated for calculations)
Optional External Power: 0.25 Amps at 9 - 24 VDC
Power Consumption (all with pressure) *:
Quiescent: 0.0004 Watts
CTD-DO Sample Acquisition
(excluding pump):
Real-time data enabled - 0.17 Watts
No real-time data - 0.155 Watts
CTD-DO Sample Waiting (not
sampling, pump running, excluding pump):
Real-time data enabled - 0.056 Watts if
receive line valid,
0.016 Watts if receive line not valid
No real-time data - 0.016 Watts
CTD-DO Between Samples:
Real-time data enabled - 0.056 Watts if
receive line valid
0.0004 Watts if receive line not valid
No real-time data - 0.0004 Watts
Pump: 0.12 Watts
Communications: 0.065 Watts
* Power consumption values are for standard RS-232 interface; for optional interfaces, see corresponding manual.
Housing, Depth Rating, Weight:
| Housing Material | Depth Rating | Weight | |
| Standard | Titanium | 7000 m (23,000 feet) | 4.2 kg (9.2 lbs) in air, 2.3 kg (5.0 lbs) in water |
| Optional (ShallowCAT) | Plastic | 250 m (820 ft) | 3.4 kg (7.5 lbs) in air, 1.5 kg (3.3 lbs) in water |
Dimensions
Note: 103 mm dimension is for plastic housing; titanium
housing dome is 9 mm smaller
Connector:
|
RS-232 or optional RS-485 Interface |
Optional SDI-12 / RS-232 Interface |
ADDITIONAL INFORMATION / LINKS:
Documentation -- manual, photos, technical papers, application notes, etc.
Sales Information -- options, accessories, cables, mount kits, spares, etc.
Software -- components of Seasoft V2
Links to Other Instruments of Interest
Specifications are subject to change without notice.
Last modified: 16-May-2013
Sea-Bird Home Phone: (+1) 425-643-9866 Fax: (+1) 425-643-9954 E-mail: seabird@seabird.com
