Abstract: A method of thermal protection of a membrane-enclosed amperometric cell of the type comprising an electrolyte within an electrolyte space containing electrodes and enclosed by a semi-permeable membrane which defines a sensor face; heat exchange within said cell is effected for controlled heat compensation of the electrolyte when the sensor face is exposed to temperatures outside of the operative temperature range of the cell.
Type:
Grant
Filed:
January 23, 1986
Date of Patent:
December 8, 1987
Assignee:
Orbisphere Corporation Wilmington, Succursale de Collonge-Bellerive
Inventors:
Harry D. Wright, John M. Hale, Eugen Weber
Abstract: A method of thermal protection of a membrane-enclosed amperometric cell of the type comprising an electrolyte within an electrolyte space containing electrodes and enclosed by a semi-permeable membrane which defines a sensor face; heat exchange within said cell is effected for controlled heat compensation of the electrolyte when the sensor face is exposed to temperatures outside of the operative temperature range of the cell.
Type:
Grant
Filed:
January 14, 1985
Date of Patent:
April 29, 1986
Assignee:
Orbisphere Corporation Wilmington, Succursale de Collonge-Bellerive
Inventors:
Harry D. Wright, John M. Hale, Eugen Weber
Abstract: A method of and a sensor for quantitative electroanalytical determination of elemental hydrogen in a fluid medium are disclosed. A membrane enclosed amperometric cell is used that has at least two electrodes in contact with an aqueous electrolyte to provide a reaction impedance of the cell; the electrolyte is separated from the fluid medium by a membrane that is permeable to elemental hydrogen but substantially impermeable to the electrolyte and provides a membrane impedance of the cell; the electrodes include an anodic hydrogen sensing electrode and a cathodic counter electrode; the sensing electrode has a polished surface consisting of a platinum metal; further, the membrane is selected such that the membrane impedance exceeds the reaction impedance sufficiently to provide for membrane-controlled operation of the cell.
Type:
Grant
Filed:
May 10, 1983
Date of Patent:
January 7, 1986
Assignee:
Orbisphere Corporation Wilmington, Succursale de Collonge-Bellerive
Abstract: A method of mounting and securing a membrane of polymer film on an amperometric cell that has a cylindrical cell end provided with an electrolyte-bearing sensor face; the holding member is a substantially non-resilient and creep-resistant die ring, having a cylindrical inner surface that fits onto the cylindrical cell end; at least one tapered inner surface portion extends outwardly toward a leading end of the die ring; the leading end is moved over the cell end whereby the polymer film is deep-drawn between the die ring and the cylindrical cell end and is permanently shaped to form a cup-shaped membrane portion sealingly held by the die ring on the cylindrical cell end during operation of the amperometric cell.
Type:
Grant
Filed:
June 30, 1980
Date of Patent:
April 20, 1982
Assignee:
Orbisphere Corporation Wilmington, Succursale de Collonge-Bellerive
Abstract: Electroanalytic transducers for electrochemical analysis of chemical substances are disclosed. The transducers are of the type which include electrodes contacting an electrolyte solution. In accordance with the method and apparatus of the invention, means insulating an electrode are held in a mutually pressing engagement over preselected portions of the electrode to insulate that portion from the electrolyte and prevent creep of the electrolyte between the insulating means and the preselected portions. Thus, the surface area of the electrode exposed to the electrolyte is maintained substantially constant during the service life of the transducer. In a preferred embodiment, sensor or working and counter electrodes are coaxially mounted and circumferentially coaxially separated by annular insulating means. Spring means urge the inner coaxially mounted electrode and the annular insulating means together so that only the surface of the cross-sectional end of the inner electrode is exposed to electrolyte.
Type:
Grant
Filed:
March 1, 1977
Date of Patent:
June 20, 1978
Assignee:
Orbisphere Corporation, Wilmington, Succursale de Collonge-Bellerive