| In view of the shortcomings of the current calibration method of seawater carbon dioxide sensor, such as the large size of the device and the low calibration efficiency, a miniaturized calibration control device is independently designed based on the idea of water-gas exchange. The influence of the calibration medium, the water-gas exchange method, the water-gas volume ratio and other factors on the calibration adjustment efficiency and the maintenance of the calibration environment is compared and analyzed, and the influence of the calibration adjustment efficiency and the maintenance of the calibration environment is discussed. The feasibility of using nitrogen gas for predictable adjustment is discussed. The results show that natural seawater is not suitable as a calibration medium because it cannot reach an equilibrium state, tap water, ultrapure water and artificial seawater have no obvious differences in data fluctuations, the time it takes to achieve stability and the final equilibrium concentration, they can all be used as calibration medium. Spraying and rehydration methods can greatly improve the efficiency of water-vapor mixing, the water-vapor mixing efficiency is the highest when the three are shared: bulging , spraying and rehydration, by reducing the volume of water or gas in the calibrator and reducing the proportion of water at a certain time in the total volume, the water-vapor mixing efficiency can be improved. It is feasible to use nitrogen for predictable water mixing based on time and flow rate regulation. The paper clarifies the impact of the differences in the setting of various parameters on the calibration efficiency and the maintenance of the calibration environment, verifies the predictability of nitrogen regulation, and provides data support for the subsequent establishment of a complete, efficient and automated calibration scheme for seawater carbon dioxide sensors. |
