Honeywell International Inc.

Peter J M Kroot

Michael L Rhodes

Palani Thanigachalam

Vishal Malhan

Ramsesh Anilkumar

Baburaj Kaimalilputhenpura Prabhakaran

A single cell oxygen sensor apparatus and method are disclosed. An yttrium-based stabilized layer having electrical terminals connected to the yttrium-based stabilized layer can be provided on a substrate, wherein the yttrium-based stabilized layer is excitable by a constant current applied to the electrical terminals. A plurality of electrodes are located on a side of the yttrium-based stabilized layer and a plurality of heater elements located on said substrate opposite said yttrium-based stabilized layer. The heater elements can maintain the yttrium-based stabilized layer at a particular temperature. A cavity is formed and located between the yttrium-based stabilized layer and the heater elements. The partial pressure of oxygen can be measured by comparing the partial pressure of oxygen within the cavity with respect to the partial pressure of oxygen in the atmosphere external to the single cell oxygen sensor apparatus.

Single cell sensor for measuring the partial pressure of oxygen

Apparatus and methods for measuring NOconcentrations are disclosed. One method includes the steps of providing a gas stream having a NO concentration and a NOconcentration, wherein a sum of the NO concentration and the NOconcentration is a total NOconcentration; contacting the gas stream with a first zirconium oxide based oxygen sensor at a first temperature to achieve a first NO:NOequilibrium at the first temperature; contacting the gas stream with a second zirconium oxide based oxygen sensor at a second temperature to achieve a second NO:NOequilibrium at the second temperature; and determining the total NOconcentration by measuring a response of the first zirconium oxide based oxygen sensor to achieve the first NO:NOequilibrium and a response of the second zirconium oxide based oxygen sensor to achieve the second NO:NOequilibrium. The second temperature is different than the first temperature.

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Nuenen, Netherlands

Peter J M Kroot