Electrochemical gas sensor
First Claim
1. A gas sensor for determining an electrochemically active gas in the atmosphere comprising a working electrode and a counter electrode in contact with an electrolyte, the working electrode and counter electrode being bonded in close proximity on one surface of a gas-permeable membrane phobic to the electrolyte, each of said electrodes comprising a catalytic metal, means for exposing the working electrode and the counter electrode to the atmosphere to be tested and masking means for preventing exposure of at least a portion of the counter electrode to the electrochemically active gas, whereby the presence of electrochemically active gas in the atmosphere to be tested produces a current.
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Accused Products
Abstract
Electrochemical sensor cells having reduced zero current temperature sensitivity comprise a working electrode and a counter electrode in close proximity and in contact with an electrolyte. Both electrodes are exposed to the atmosphere to be tested and at least a portion of the counter electrode is masked from the electrochemically active gas in the atmosphere.
60 Citations
13 Claims
- 1. A gas sensor for determining an electrochemically active gas in the atmosphere comprising a working electrode and a counter electrode in contact with an electrolyte, the working electrode and counter electrode being bonded in close proximity on one surface of a gas-permeable membrane phobic to the electrolyte, each of said electrodes comprising a catalytic metal, means for exposing the working electrode and the counter electrode to the atmosphere to be tested and masking means for preventing exposure of at least a portion of the counter electrode to the electrochemically active gas, whereby the presence of electrochemically active gas in the atmosphere to be tested produces a current.
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9. An electrode assembly for an electrochemical gas sensor comprising a working electrode and a counter electrode of catalytic metal deposited in close proximity on one surface of a gas-permeable membrane, and a gas-impermeable film secured to the opposite surface of the membrane over a major portion of the counter electrode.
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10. An electrode assembly for an electrochemical gas sensor comprising a working electrode and a counter electrode of catalytic metal deposited in close proximity on one surface of a gas-permeable membrane, and a cover means secured to and having a portion spaced from the opposite surface of the membrane to form a chamber between the membrane and cover extending over at least a portion of the working electrode and counter electrode, a gas diffusion opening through the cover and aligned with the working electrode so that substantially all the gas diffusing through said diffusion path is exposed to the working electrode.
- 11. An assembly for an electrochemical gas sensor comprising a working electrode and a counter electrode of catalytic metal deposited in close proximity on one surface of a gas-permeable membrane, gas impermeable masking means secured to the opposite surface of said membrane, said masking means masking a major portion of the counter electrode and having a portion spaced from the opposite surface of the membrane to form a chamber between the membrane and cover extending over at least a portion of the working electrode and counter electrode, and a gas diffusion opening through the cover and aligned with the working electrode so that substantially all the gas diffusing through said diffusion path is exposed to the working electrode.
Specification