The SBE 37-IM MicroCAT is a high-accuracy conductivity and temperature sensor/recorder (pressure optional) with internal battery, non-volatile memory, and built-in Inductive Modem. Calibration coefficients are stored in EEPROM, allowing output of C, T, P, and time in ASCII engineering units (decimal or XML; raw output available).
Sea-Bird ElectronicsThe SBE 37-IM MicroCAT is a high-accuracy conductivity and temperature sensor/recorder (pressure optional) with internal battery, non-volatile memory, and built-in Inductive Modem. Calibration coefficients are stored in EEPROM, allowing output of C, T, P, and time in ASCII engineering units (decimal or XML; raw output available).
The Inductive Modem (IM) system provides reliable, low-cost, real-time data transmission for up to 100 IM-enabled instruments using plastic-coated wire rope (typically 3 x 19 galvanized steel) as both the transmission line and mooring tension member. IM instruments clamp anywhere along the rugged mooring wire. Expensive and potentially unreliable multi-conductor electrical cables with fixed position underwater connectors are not required. IM moorings are easily reconfigured for changing deployments (positions changed or instruments added or removed), by sliding and re-clamping instruments on the cable. IM systems are much less expensive and more power-efficient than acoustic modems, and offer reliable communication over greater distances.
In a typical mooring, an Inductive Modem Module (IMM) or Surface Inductive Modem (SIM) housed in the buoy communicates with underwater IM instruments and is interfaced to a computer or data logger via an RS-232 serial port. The computer or data logger (not supplied by Sea-Bird) is programmed to poll each IM instrument on the mooring for its data, and send the data to a telemetry transmitter (satellite link, cell phone, RF modem, etc.). The MicroCAT saves data in memory for upload after recovery, providing a data backup if real-time telemetry is interrupted.
SBE-37-IM Brochure - Download
SBE-37-IM Manual - Download
AN 02D: Instructions for Care and Cleaning of Conductivity Cells (03/14) - Download
AN 06: Determination of Sound Velocity from CTD Data - Download
AN 10: Compressibility Comp of SBE Conductivity Sensors (05/13) - Download
AN 14: 1978 Practical Salinity Scale - Download
AN 27Druck: Minimizing Strain Gauge Pressure Sensor Errors - Download
AN 42: ITS-90 Temperature Scale - Download
AN 69: Conversion of Pressure to Depth - Download
AN 71: Desiccant Use and Regeneration (drying) - Download
AN 73: Using Instruments with Pressure Sensors at Elevations Above Sea Level - Download
AN 83: Deployment of Moored Instruments - Download
AN 85: Handling of Ferrite Core on Instruments with Inductive Modem Telemetry - Download
AN 89: Retrofit Battery Pack for SBE 37 MicroCAT and SBE 44 Underwater Inductive Modem - Download
AN 90: Absolute Salinity and TEOS-10: Sea-Bird's Implementation - Download
MicroCAT Feature Comparisons - Download
Guide to CTDs - Download
Guide to CTDs - Download
The acquisition, calibration, and data analysis of CTD data - Download