Patent ID: 7001495

Claim:
A gas sensor for oxides of nitrogen assembly comprising: (a) an electrolyte comprising: (i) one or more alkali metal nitrates; (ii) one or more alkaline earth metal nitrates; and (iii) one or more reference electrode metal halogens, wherein the reference electrode metal of the reference electrode metal halogens is chosen from the group consisting of ruthenium, rhodium, palladium, rhenium, osmium, iridium, platinum and gold and the halogens of the reference metal halogens are chlorine, bromine or iodine; (b) the electrolyte in electrochemical connection between a sensing electrode and a reference electrode, whereby the reference electrode consists of a first reference electrode metal and the sensing electrode consists of any other reference electrode metal; and (c) the electrolyte and electrodes are supported on a substrate.