Patent ID: RE45100

Claim:
An electrochemical gas sensor for quantitative measurement of a gas in an ambient atmosphere comprising: a porous mixed ionic-electronic conductive sensing electrode having both an electronic conducting material and an ionic conducting material; a porous mixed ionic-electronic conductive counter electrode having both an electronic conducting material and an ionic conducting material; a first protonic conductive electrolyte membrane in between and in contact with the sensing and counter electrodes, and having a thickness in the range of approximately 0.1 mm to 1 mm; the sensing electrode reacting with the gas to produce a change in an electrical characteristic between the sensing electrode and the counter electrode; means for electrical measurement; said sensing and counter electrodes each having a diameter in the range of approximately 1 mm to 15 mm, and being electrically connected to said electrical measurement means; whereby, in a positive ambient concentration of said gas, said electrical measurement means detects changes in said electrical characteristic.