| 摘要 |
A device for measuring a concentration of a selected gas such as carbon dioxide comprises a container 30 for a liquid, preferably an electrolyte such as an aqueous amine solution, capable of dissolving or reacting with the gas. Means 16 are provided in the container for measuring an electrical property of the liquid such as conductivity or capacitance. For bringing the gas into contact with the liquid there is provided a wall or membrane which is water-impermeable but permeable to the gas whose concentration is to be measured. The membrane may comprise a wall of the container 30. The gas diffuses through the wall into the container at a rate which depends on its concentration outside the container. Gas diffusing into the container dissolves in and/or reacts with the liquid, altering its electrical properties to give a reading indicative of the gas concentration to be measured. |
