The superior performance of the SBE 3plus results from its superior calibration, response characterization, and quality testing program.
Sea-Bird ElectronicsThe superior performance of the SBE 3plus results from its optimized electronic design, superior calibration, response characterization, and quality testing program. The SBE 3plus is a more rigorously tested and calibrated version of our SBE 3F temperature sensor. A sensor is designated as an SBE 3plus only after demonstrating drift of less than 0.001 °C during a six-month screening period. In addition, the time response is carefully measured and verified to be 0.065 ± 0.010 seconds. Every SBE 3plus is calibrated in Sea-Bird's computer-controlled calibration baths. These super-low-gradient baths produce temperature calibrations with resolution and accuracy not previously available to oceanographers. These sensors can be successfully calibrated as separate modules, because they have built-in acquisition circuits and frequency outputs. When used with a Sea-Bird CTD, the overall system accuracy is limited only by the accuracy of the CTD's master clock. Errors from this source are demonstrably negligible (in the SBE 911plus CTD, clock error contribution is 0.00016 °C based on a five-year worst case error budget, including ambient temperature influence of 1 ppm total over -20 to +70°C, 1 ppm first year drift, and four additional year's drift at 0.3 ppm per year).
Brochure SBE-3plus - Download
AN 42: ITS-90 Temperature Scale - Download
AN 71: Desiccant Use and Regeneration (drying) - Download
SBE-9plus Underwater Unit
The standard SBE 9plus underwater unit has an aluminum housing rated to 6800 meters (22,300 ft), and is supplied with one conductivity and one temperature sensor (fitted with a TC Duct and constant-flow pump), and an internally mounted, temperature-compensated Paroscientific Digiquartz pressure sensor for 6800 meter (10,000 psia) full scale range.