Patent Number: 6,254,749

Title: Carbon monoxide gas sensor and measuring device using the same sensor

Abstract: In a CO gas sensor composed of a CO gas sensing electrode 3 being made of Au or an Au alloy and a reference electrode 2 electrically connected to at least part of a surface of a solid electrolyte having an oxygen ion transfer property, which is superior in CO gas selectivity, in particular, reducing the affect of the co-existing oxygen to CO, and which works with a high precision at a high temperature, and in a CO gas measuring device using the gas sensor, the gas sensor being capable of determining a CO gas concentration by measuring a electromotive force change due to adsorption/oxidization of the carbon monoxide gas in the sensing electrode 3 when a constant current is caused to flow between the reference electrode 2 and the sensing electrode 3 or a current value caused by the oxidizing reaction of the carbon monoxide gas in the sensing electrode when a voltage is kept constant between the reference electrode 2 and the sensing electrode 3.

Inventors: Yokota; Minoru (Nagoya, JP), Murase; Takao (Konan, JP), Mizusaki; Junichiro (Sebdai, JP)

Assignee: NGK Insulators, Ltd.

International Classification: G01N 27/407 (20060101); G01N 33/00 (20060101); G01N 027/407 ()

Expiration Date: 07/03/2018