Electrochemical sensor for detecting a predetermined gas
AssigneeNational Draeger Incorporated
InventorPiers Richard Grove Warburton
Life of this patent
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Abstract
A gas sensor (8) includes a body (10) that is shaped to define a chamber (14). An electrolyte (34) is contained in the chamber (14) and three electrodes (26, 28 and 30) that are located on an electrode substrate (24) are disposed in contact with the electrolyte. The body (10) is electrically connected to the three electrodes. A cover (36) engages the body (10) to enclose the chamber (14). A resistor array (58a-58n) is located between the cover (36) and the electrode substrate (24). The resistors (58a-58n) are coated with a compound that emits a predetermined gas in response to temperature increase. To test the sensor (8) voltage is selectively applied to the resistor array (58a-58n) to introduce the gas to the gas diffusion path of the sensor (8).
Claims9
An electrochemical sensor for detecting a predetermined gas, said sensor comprising:
- a sensor assembly that defines an internal chamber and a gas diffusion pathway between the external surface of the sensor and the internal chamber;
- an electrolyte that is maintained in said chamber;
- a plurality of electrodes that are disposed in contact with said electrolyte;
- and
- means for emitting the predetermined gas to the gas diffusion path, the emitting means being located in said sensor assembly and including at least one element that emits the predetermined gas in response to an electrical power signal, said element being a resistor that is coated with a compound that includes the oxalate salt of a metal selected from the group consisting of alkali metals and alkaline earth metals.
An electrochemical sensor for detecting a predetermined gas, said sensor comprising:
- a sensor assembly that defines an internal chamber and a gas diffusion pathway between the external surface of the sensor and the internal chamber, said sensor assembly further including a plurality of electrically conductive portions and an electrically non-conductive portion that is spaced between said electrically conductive portions, said sensor assembly also including a cover that mechanically urges said electrodes against said electrically conductive portions;
- an electrolyte that is maintained in said chamber;
- a plurality of electrodes that are disposed in contact with said electrolyte, said electrodes being mounted in a substrate;
- and
- means for emitting the predetermined gas to the gas diffusion path, the emitting means being located between the cover of said sensor assembly and the substrate wherein said electrodes are mounted, said emitting means including at least one element that emits the predetermined gas in response to an electrical power signal.
Dependencies are inferred from the claim text.