Development of High Accuracy CTD Sensor: 5EL-CTD

Abstract

The authors have developed a new CTD sensor with the primary objective of achieving high accuracy to address the requirements for analyzing the impacts of global warming. The conductivity sensing cell is based on the five electrode principle. The temperature sensor consists of a thermistor with a diameter of 0.43 millimeters. For the pressure sensor, a reliable OEM product has been utilized. Additionally a calibration bath capable of sea water and demonstrating temperature stability within a range 0.0005 degrees Celsius over ninety seconds, was developed. The C- and T-sensor underwent primary calibration with the assistance of JAMSTEC, Japan. T-sensor successfully achieved a combined uncertainty of less than 0.001 degrees Celsius. However, the C-sensor yielded incomplete results, with a preliminary estimate of its uncertainty at approximately 0.002 mS/cm. The depth sensor, calibrated using a dead weight tester maintains its uncertainty within 0.1 percent full-scale range. A subsequent calibration procedure to bridge the primary to secondary step, facilitated by a soaking block, was explored. The result indicated satisfactory performance in temperature calibration but many rooms for improvement in that of conductivity. Finally, a field test was conducted at the coast of Japan, producing promising results for CTD profiling. The developed sensor demonstrates potential in contributing to accurate and reliable data collection for assessing the effects of global warming.

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