Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1975-06-09
1976-12-14
Tung, T.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
324 29, G01N 2746
Patent
active
039974197
ABSTRACT:
An electrochemical device for sensing the concentration of dissolved oxygen in aqueous liquids is described. The device has a housing with a projecting boss that supports an assembly of the cell cathode and a permeable membrane with a removable retainer means overlying peripheral edges of the membrane and with compressive sealing means to permit facile replacement of the membrane and/or cathode. The cell anode is of expanded form in the shape of a coiled metal wire wrapped about a plurality of spaced posts within the cell chamber. Internally of the chamber is a tubular means which projects above the cathode in juxtaposition to the expanded form anode to provide a well about the cathode which is thereby shielded from accumulation of any precipitate that may form in the electrolyte in the proximity of the anode surfaces. The electrochemical system includes an electrolyte of approximately equal molar concentrations of a potassium halide, preferably iodide, and potassium hydroxide which provides maximum sensitivity and operating life. The preferred electrodes are a silver cathode and lead anode which generate a sufficient potential for accurate measurement of dissolved oxygen in aqueous media. The electrodes are connected in the external circuit to a load resistor and the voltage generated across the resistor is applied to a sensitive galvanometer which is calibrated or standardized to dissolved oxygen concentrations. A temperature compensating circuit can also be provided.
REFERENCES:
patent: 3133873 (1964-05-01), Miller et al.
patent: 3235477 (1966-02-01), Keyser et al.
patent: 3351544 (1967-11-01), Medlar
patent: 3510421 (1970-05-01), Gealt
Brushwyler Gordon R.
Scott Timothy F.
Robertshaw Controls Company
Tung T.
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