Lean shift correction of potentiometric oxygen sensors
First Claim
Patent Images
1. An exhaust sensor comprising:
- inner and outer electrodes, an electrolyte body between the electrodes, and a first porous protective coating on the outer electrode, said first porous protective coat having a thickness ranging from about 100 to about 500 microns;
a catalytic pre-equilibration layer overlying the first porous protective coat so that the first porous protective coat separates the outer electrode from the catalytic pre-equilibration layer, said catalytic pre-equilibration layer consisting essentially of at least one metal selected from the group consisting of platinum, palladium, rhodium, transition metals and mixtures thereof, and said catalytic pre-equilibration layer having a thickness ranging from about 100 Angstroms to 100 microns.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention includes the use of a pre-equilibration zone on an exhaust gas sensor to provide catalytic site to catalyze non-reacted components of the exhaust gas prior to the gas sample reaching the sensor'"'"'s outer electrode. The pre-equilibration zone preferably includes a precious metal on the surface of a porous carrier. The invention also includes a method of making an exhaust sensor including a pre-equilibration zone, and a method of sampling an exhaust gas by passing the same through a pre-equilibration zone.
44 Citations
6 Claims
-
1. An exhaust sensor comprising:
-
inner and outer electrodes, an electrolyte body between the electrodes, and a first porous protective coating on the outer electrode, said first porous protective coat having a thickness ranging from about 100 to about 500 microns; a catalytic pre-equilibration layer overlying the first porous protective coat so that the first porous protective coat separates the outer electrode from the catalytic pre-equilibration layer, said catalytic pre-equilibration layer consisting essentially of at least one metal selected from the group consisting of platinum, palladium, rhodium, transition metals and mixtures thereof, and said catalytic pre-equilibration layer having a thickness ranging from about 100 Angstroms to 100 microns. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification