Oxygen Electrode Design

Look at the diagram above of a common design of an oxygen electrode.

• The sample chamber is surrounded by a water jacket, so that it can be maintained at a constant temperature.
• The adjustable stopper seals the sample chamber away from the atmosphere so that oxygen cannot be replaced as it is used.
• A narrow hole through the adjustable stopper allows additions to be made to the sample chamber.
• A magnetically-driven stirring bar at the bottom of the sample chamber rotates to keep the contents thoroughly mixed.