Gas Sensor
AssigneeHoneywell International Inc.
InventorMartin Jones
Life of this patent
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Abstract
The present invention provides a unique solution to the problems of both steady-state and transient signals produced by a variety of interfering stimuli, including humidity, which relies upon the inclusion in a gas sensing electrode in an electrochemical gas sensor of a catalyst material in addition to a first catalyst material reactive to the target gas, the additional, or second, catalyst material producing a response to an interfering stimulus which is of the opposite polarity to that generated by the first catalyst material.
Claims33
An electrochemical gas sensor for sensing a target gas, the sensor comprising a gas sensing electrode;
- a counter electrode;
- and an electrolyte with which both the gas sensing electrode and the counter electrode are in contact,
- wherein the gas sensing electrode comprises a first catalyst material reactive to the target gas and which produces a response to an interfering stimulus, and a second catalyst material which produces a response to the interfering stimulus of opposite polarity to the response of the first catalyst material to that interfering stimulus.
An electrode for sensing a target gas in an electrochemical gas sensor, the electrode cormprising, supported on or dispersed within a support material, a catalyst composition comprising a first catalyst material reactive to the target gas and which produces a response to an interfering stimulus, and a second catalyst material which produces a response to the interfering stimulus of opposite polarity to the response of the first catalyst material to the same interfering stimulus.
A catalyst composition comprising a mixture of graphite and ruthenium, wherein the ruthenium is present in an amount of greater than 0 weight % up to about 7 weight % of the total composition.
An electrochemical gas sensor for sensing a target gas comprising an electrochemical gas sensor for sensing a target gas and generating a sensor output related to the concentration of the target gas, the sensor comprising a first gas sensing electrode comprising a first catalyst material reactive to the target gas and which produces a response to an interfering stimulus;
- a second gas sensing electrode comprising a second catalyst material which produces a response to the interfering stimulus of opposite polarity to the response of the first catalyst material to that interfering stimulus;
- a counter electrode;
- an electrolyte with which each of the gas sensing electrodes and the counter electrode are in contact;
- and means for electronically processing the responses of the first and second gas sensing electrodes, so as to reduce or cancel out the effect on sensor output of the interfering stimulus.
Use, in an electrochemical gas sensor for sensing a target gas, the sensor comprising a gas sensing electrode;
- a counter electrode;
- and an electrolyte with which both the gas sensing electrode and the counter electrode are in contact, wherein the gas sensing electrode comprises a first catalyst material reactive to the target gas and which produces a response to an interfering stimulus, of a second catalyst material which produces a response to the interfering stimulus of opposite polarity to the response of the first catalyst material to that interfering stimulus.
Dependencies are inferred from the claim text.