Patent ID: 8617372

Claim:
A method of sensing ammonia (NH 3 ) with an array-type sensor, the array-type sensor comprising a substrate that comprises an oxygen-ion conducting material, and an array of electrodes disposed on the substrate, the method comprising: operating a first electrode of the array of electrodes at a first temperature that is in a first temperature range, the first temperature range being from approximately 550-degrees Celsius to approximately 650-degrees Celsius, the first electrode comprising platinum (Pt); operating a second electrode of the array of electrodes at a second temperature that is in the first temperature range, the second electrode comprising manganese (III) oxide (Mn 2 O 3 ); operating a third electrode of the array of electrodes at a third temperature that is in a second temperature range, the second temperature range being from approximately 650-degrees Celsius to approximately 750-degrees Celsius, the third electrode comprising tungsten trioxide (WO 3 ); operating a fourth electrode of the array of electrodes at a fourth temperature that is in the second temperature range, the fourth electrode comprising La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 ; operating a fifth electrode of the array of electrodes at a fifth temperature that is in the second temperature range, the fifth electrode comprising LaCr 0.95 Mg 0.05 O 3 ; and sensing, with the array-type sensor, ammonia (NH 3 ) in response to the first electrode operating at the first temperature, the second electrode operating at the second temperature, the third electrode operating at the third temperature, the fourth electrode operating at the fourth temperature, and the fifth electrode operating at the fifth temperature.