Abstract: An electrical membrane probe for the measurement of dissolved oxygen concentration in fluids, particularly designed for monitoring or control of fermentation process and characterized as follows:1. The anode metal is lined on the internal wall of the electrolytic cell which is made of metal tube.2. The vent hole for the adjustment of outer and inner pressures and the protection cover to prevent the inflow of medium into the cell are provided.3. All of parts are connected with each other mechanically then unskilled operators can exchange the especially membrane and cathode, when some of the parts are ruptured or worn out.4. The probe can maintain its ability even after repeated steam sterilization at high temperatures such as 130.degree. C.5. The deterioration of insulation is completely prevented by using glass as insulating material.6. The membrane can be removed and exchanged easily by removing the membrane holding cap.

Abstract: An electrical membrane probe for the measurement of dissolved oxygen concentration in fluids, particularly designed for monitoring or control of fermentation process and characterized as follows;1. The anode metal is lined on the internal wall of the electrolytic cell which is made of metal tube.2. The vent hole for the adjustment of outer and inner pressures and the protection cover to prevent the inflow of medium into the cell are provided.3. All of parts are connected with each other mechanically then unskilled operators can exchange the especially membrane and cathode, when some of the parts are ruptured or worn out.4. The probe can maintain its ability even after repeated steam sterilization at high temperatures such as 130.degree. C.5. The deterioration of insulation is completely prevented by using glass as insulating material.6. The membrane can be removed and exchanged easily by removing the membrane holding cap.