| 摘要 |
PURPOSE:To improve response speed and to prevent irregularity to be generated in products by providing a spacer having a specified thickness between an oxygen transmitting film and a detecting electrode. CONSTITUTION:A gold wire having the diameter of 1mm is embedded as a detecting electrode 2 in a detecting electrode supporting body having the outer diameter of 7mm. A silver wire having the diameter of 1mm is provided as a counter electrode 3 at the outside of said supporting body in an outer tube having the inner diameter of 10mm. As an electrolyte, 1% aqueous solution of potassium chloride is used. As an oxygen transmitting film 4, a polytetrafluoroethylene film having the thickness of 25mum is used. A spacer 5 which has the thickness of 0.5-100mum and comprises, e.g. a porous cellulose film, is provided between the electrode 2 and the film 4. In this constitution response is quick, and irregularity in measured values between each of product electrodes caused by the surface state of the electrodes and the like becomes less. Therefore, this electrode can be used as a high-speed, stable oxygen electrode in control of a fermentation process and measurement of environments such as water quality. |
