Figaro Engineering Inc.

Hideki Okoshi

Tomohiro Inoue

Kazunari Kaneyasu

Tomoko Yoshimura

Tohru Nomura

Takeshi Nakahara

Yutaka Kishimoto

Yuichiro Tajiri

A MEAhaving a proton conductive membrane is sandwiched by metal platesand they are further sandwiched by heat pressable films. An openingand an openingare formed in the heat pressable filmand the metal plate, respectively so that an electrodeis used as the sensing electrode and exposed to atmosphere to be measured. Openingsare formed in the heat pressable filmand metal plate, respectively so that an electrodeis used as the counter electrode, and water vapor is supplied to the electrode from a water pack.

Proton conductor gas sensor

A proton conductor gas sensor whose durability at high temperature is enhanced by using gel not converted to sol even at high temperature in a water reservoir. Fine particles of silica are gelled by adding water thereto and agitating the mixture under shear force. The thus obtained gel () is placed in a water reservoir of proton conductor gas sensor () and fed through steam introduction port () to MEA ().

A base is provided with a concave and three leads, and the central lead is bent to the side opposite to the concave, and the other leads are bent to the side of the concave. A central electrode of a sensor element is attached to the central lead and the bottom of the concave and a coil serving as both a heater and an electrode is attached to the other leads to support the sensor element on a small base at four points.

Gas sensor and method for producing it

A central electrode is arranged in a coiled heater electrode They are buried in a SnO -based inner area and the entirety is covered by a filter The volume of the inner area is set at from 1&times;10 mm to 16&times;10 mm , the total volume of the bead is set at from 15&times;10 mm to 70&times;10 mm , and the ratio of the total volume of the bead to the volume of the inner area is set at from four to twenty to bring the sensor resistance in CO and that in methane closer to each other and increase the selectivity from hydrogen.

Growing community of inventors

Osaka, Japan

Hideki Okoshi