SBE 37 MicroCAT

The SBE 37 MicroCAT is a high-accuracy conductivity and temperature (pressure optional) recorder with Serial interface (RS-232 or RS-485), memory, and an optional pump. Externally powered, it can be used for moored applications requiring fast sampling. The MicroCAT is useful as a stand-alone monitoring device and is easily integrated with other instrumentation platforms. Data is output in real-time and can be recorded in memory; memory capacity exceeds 530,000 samples. Measured data and derived variables (salinity, sound velocity, depth, density) are output in engineering units.

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SBE 37 MicroCAT: Trusted Mooring CTD

The SBE 37 MicroCAT delivers high‑accuracy conductivity, temperature, optional pressure, and optional oxygen for long‑term moorings. With inductive modem telemetry, internal memory, battery endurance, optional oxygen, anti‑fouling options, and pump/ODO variants, it’s built for reliable, multi‑year ocean monitoring.

Key Features

Moored Conductivity, Temperature, Pressure (optional), Oxygen (optional), with user-programmable sampling — 6-sec to 6-hour intervals, or continuous (1.0 sec without pressure, 1.5 sec with pressure)
RS-232 interface.
Internal memory, external power
Expendable anti-foulant devices 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

Parameters Measured

Specifications

Specification	Value
Communication Options	RS-232 , RS-485 , inductive_modem
Depth Rating (Meters)	350m, 7000m
Power Source	Internal , External
Housing Material Options	Plastic, Titanium
Onboard Memory	Yes
Connector	MCBH , Inductive Modem
Sampling Rate	2.4-3.2 sec/sample
Memory Capacity (Samples)	380000
Power Consumption	7.8 Amp-hour (nominal) battery pack (derated for calculations) 25,000 samples CTD-DO (see manual)
Accuracy	Conductivity ± 0.0003 S/m (0.003 mS/cm), Temperature ± 0.002 °C (-5 to to 35 °C); ± 0.01 °C (35 °C to 45 °C), Dissolved Oxygen larger of ± 3 μmol/kg (0.07 ml/L, 0.1 mg/L) or ± 2% Optional Pressure ± 0.1% of full scale range
Software	Fathom , SeaSoft
Resolution	Conductivity 0.00001 S/m (0.0001 mS/cm), Temperature 0.0001 °C, Dissolved Oxygen 0.2 μmol/kg, Optional Pressure 0.002% of full scale range
Biofouling Protection	Yes