Patent ID: 7393505
Filing Date: 2008-07-01
Classification: G01N

Abstract:
1. A proton conductor gas sensor comprising: a sensor body having a membrane electrode assembly (MEA) comprising an electrolyte membrane, a sensing electrode, and a counter electrode, and a water reservoir positioned at one side of the sensor body and supplying water vapor to the membrane electrode assembly; a cap body including a cap, a bottom plate, and filter material provided between said cap and said bottom plate, said cap having at least one first opening and said bottom plate having a second opening for introducing ambient atmosphere towards said membrane electrode assembly from an opposite side of the membrane electrode assembly to the water reservoir; and a thin nonporous, metal plate between said bottom plate and said membrane electrode assembly, having a diffusion control hole connected to the second opening of the bottom plate and having a smaller diameter than that of the opening of the bottom plate.