| 摘要 |
An electrode device for electrochemical measurement of the concentration of the partial pressure of a gas in a liquid or a gas mixture, comprises a measuring surface constituted by or comprising the sensitive part (4) of a measuring electrode and a membrane (6) placed in front of the measuring surface and delimiting a volume of electrolyte solution (5) which is in contact with the measuring electrode. The membrane is permeable to the gas to be determined, and a given distance is obtained and maintained between the measuring surface and the membrane by means of particles (7). When assembling the electrode device, a dispersion of the particles in the electrolyte to be incorporated in the electrode device is applied on the measuring surface and/or the membrane in excess, and the electrode device is assembled, whereby excess dispersion is pressed out. The dispersion of the particles in the electrolyte is gelled so that it is stable. By using particles for obtaining and maintaining the distance between the measuring surface and the membrane, it is possible to obtain very small distances between the measuring surface and the membrane, and the thickness of thin electrolyte layers is easy to control using particles, thus reducing the response time of the electrode. Furthermore, the thickness of the electrolyte layer is adjusted automatically when assembling the electrode device and the membrane between which a dispersion of particles is placed. |
