Model SBE 37-SMP -MicroCAT C-T (P) Recorder

The SBE 37-SMP pumped MicroCAT is a high-accuracy conductivity and temperature (pressure optional) recorder with Serial interface (RS-232 or RS-485), internal batteries, Memory, and integral Pump. The MicroCAT is designed for moorings or other long-duration, fixed-site deployments.

Data is recorded in memory and can be output in real-time. Measured data and derived variables (salinity, sound velocity) are output in engineering units.

Memory capacity exceeds 530,000 samples. Battery endurance varies, depending on sampling scheme. Sampling every 2-1/2 minutes, the MicroCAT can be deployed for 2 years (425,000 samples).

FEATURES

• Moored Conductivity, Temperature, and Pressure (optional), at user-programmable 6-sec to 6-hour intervals.
• Integral pump.
• RS-232 or RS-485 interface.
• Internal memory and battery pack (can be powered externally).
• Expendable anti-foulant devices, unique flow path, and pumping regimen for bio-fouling protection.
• 350 m plastic or 7000 m titanium housing.
• Seasoft©V2 Windows software package (setup, data upload, and data processing).
• Field-proven MicroCAT family, with more than 10,000 instruments deployed.
• Five-year limited warranty

COMPONENTS

• Unique internal-field conductivity cell permits use of expendable anti-foulant devices, for long-term bio-fouling protection.
• Aged and pressure-protected thermistor has a long history of exceptional accuracy and stability.
• Optional strain-gauge pressure sensor with temperature compensation is available in eight ranges (maximum depth 7000 m).
• Pump runs for 1 second for each sample, providing improved conductivity response and bio-fouling protection.

OPTIONS

• Plastic (350 m) or titanium (7000 m) housing.
• RS-232 or RS-485 interface.
• No pressure, or strain-gauge pressure sensor in one of 8 ranges.
• XSG or wet-pluggable MCBH connector.
• Wire mounting clamp and guide or brackets for mounting to a flat surface.

Specifications

Measurement Range

Conductivity: 0 to 7 S/m (0 to 70 mS/cm)
Temperature: -5 to +45 °C
Optional Pressure: 0 to 20 / 100 / 350 / 600 / 1000 / 2000/ 3500 / 7000 m (meters of deployment depth capability)

Initial Accuracy

Conductivity: ± 0.0003 S/m (0.003 mS/cm)
Temperature: ± 0.002 °C (-5 to +35 °C); ± 0.01 (+35 to +45 °C)
Optional Pressure: ± 0.1% of full scale range

Typical Stability

Conductivity: 0.0003 S/m (0.003 mS/cm) per month
Temperature: 0.0002 °C per month
Optional Pressure: 0.05% of full scale range per year

Resolution

Conductivity: 0.00001 S/m (0.0001 mS/cm)
Temperature: 0.0001 °C
Optional Pressure: 0.002% of full scale range

Miscellaneous

Acquisition Time: 1.9 - 2.9 sec/sample (see manual)
Power Supply & Consumption: 10.6 Amp-hour (nominal) battery pack (derated for calculations);
425,000 samples CTD (see manual)
Optional External Power: 0.25 Amps at 9-24 VDC
Memory Capacity: 530,000 samples CTD
Housing, Depth Rating, & Weight (without pressure): Plastic, 350 m, 3.4 kg in air, 1.6 kg in water.
Titanium, 7000 m, 3.7 kg in air, 2.2 kg in water.