Measurement
The SBE 43 measures dissolved oxygen in millilitres of oxygen per litre of seawater.
Description
The SBE 43 uses a Clark polarographic membrane type (see image). In these sensors, oxygen molecules diffuse through a membrane and are converted at a gold cathode to hydroxyl ions (OH-). The rate of diffusion of oxygen molecules leads to a measurable electrical current that the sensor electronics converts to a voltage. The voltage signal is linear with partial pressure of oxygen. Taking temperature, salinity, and pressure into account, oxygen concentration can be calculated.
To read more on how Sea-Bird has refined this technology to accurately measure dissolved oxygen in the ocean, click here.
Technical Specifications
| O2 | |
|---|---|
| Units | ml/L |
| Range | 120% of surface saturation |
| Accuracy | 2% of saturation |
| Stability | 2% per 1000 hrs |
