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SBE-39-IM Temperature (& Pressure) Recorder

SBE-39-IM Temperature (& Pressure) Recorder
The SBE 39-IM is a high-accuracy temperature (pressure optional) recorder with built-in Inductive Modem.

SBE-39-IM Temperature (& Pressure) Recorder

Sea-Bird Electronics

The SBE 39-IM is a high-accuracy temperature (pressure optional) recorder with built-in Inductive Modem. The modem provides reliable, low-cost, real-time data transmission for up to 100 sensors — all 39-IMs or a mix with other IM-capable instruments — using a single, plastic-coated, steel mooring cable. IM instruments clamp anywhere along the inherently rugged mooring cable; expensive and potentially unreliable multi-conductor cables are not required.

IM sensor moorings are easily reconfigured to meet changing deployment scenarios. Because sensor positions can be altered (or sensors added/deleted) by sliding and re-clamping sensors on the wire, there is no need to design and purchase a new cable with different breakout locations. IM systems permit data telemetry from sensors located anywhere along the mooring wire, making them far more efficient and flexible than acoustic modem types that place serious demands on battery capacity and return data from a single underwater position only. At the surface (typically in a buoy), a Surface Inductive Modem (SIM) completes the link between the sensors and a computer or data logger. Data from the sensor string can be stored and transmitted via satellite link, cell phone, or radio telemetry. As insurance against real-time data loss, the 39-IM simultaneously stores data in its non-volatile memory.

The 39-IM's thermistor, the same as used in the SBE 39, has a long history of exceptional accuracy and stability; drift is typically less than 0.002 °C per year. Two thermistor configurations are offered:

- Thermistor embedded in titanium end cap (25.0-second time constant), for rugged conditions.

- External thermistor in pressure-protected sheath (0.5-second time constant), for fast sampling.

The 39-IM's optional Druck pressure sensor employs a micro-machined silicon diaphragm in which the strain elements are implanted with semiconductor fabrication techniques. Unlike metal diaphragms, silicon's crystal structure is perfectly elastic, so the sensor is essentially free of pressure hysteresis. Compensation of temperature influence on pressure is performed by the 39-IM's CPU.


Brochure SBE-39IM - Download

Manuel SBE-39IM - Download

Application Note
AN 27Druck: Minimizing Strain Gauge Pressure Sensor Errors - Download
AN 42: ITS-90 Temperature Scale - Download
AN 68: Using USB Ports to Communicate with Sea-Bird Instruments - 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 84: Using Instruments with Druck Pressure Sensors in Muddy or Biologically Productive Environments - Download
AN 85: Handling of Ferrite Core on Instruments with Inductive Modem Telemetry - Download