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US 4,729,824 AGranted
Gas sensor and method of using same
AssigneeGiner, Inc.
InventorJose D. Giner
Life of this patent
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AssigneeGiner, Inc.
InventorJose D. Giner
Estimating the term…
An electrochemical sensor capable of determining the partial pressure of various gases (e.g., CO, CO.sub.2, H.sub.2 S, alcohol vapors, hydrocarbons, NO.sub.x, etc.) and, optionally, substantially concurrently, but independently, oxygen content in gases and liquids. The sensor measures the amount of chemisorbent species formed either electrochemically by partial reduction (such as "Reduced-CO.sub.2 " in the case of CO.sub.2) or partial oxidation (in the case of alcohol) or non-electrochemically via specific adsorption (in the case of CO and hydrocarbons) on platinum or other metals. The charge required to oxidize this chemisorbed species is proportional to the amount of adsorbate on the electrode surface which is made a reproducible and reliable function of the partial pressure of the gas to be measured. By the proper selection of the sensor construction and electrical parameters, high sensitivity, fast response time, and high selectivity can be obtained.
A system for determining the concentration of carbon dioxide in a subject fluid comprising a sensor comprising at least a working electrode which will reductively adsorb carbon dioxide, a counter electrode, and means whereby said subject fluid containing carbon dioxide contacts said working electrode, said electrodes of said sensor being connected to a current or potential controlling device which, in turn, is connected to a current integrator, whereby carbon dioxide reductively adsorbed on said working electrode of said sensor is measured.
Apparatus for sensing and measuring a gas comprising:
A gas sensor for determining the concentration of gases in a subject fluid comprising at least a working electrode which will adsorb a gas, a counter electrode, an electrolyte in contact with each of said electrodes, a support structure, and a hydrophobic membrane;
A gas sensor for determining the concentration of gases in a subject fluid comprising at least a working electrode which will adsorb a gas, a counter electrode, an electrolyte in contact with each of said electrodes;
Dependencies are inferred from the claim text.