Abstract: A gas sensor includes a wiring board having an opening, a sensor element disposed within the opening and having a detection section and a heater section, and a plurality of electricity conducting members each of which has a first end portion joined to the wiring board and a second end portion joined to the sensor element and which establish electrical connection between the wiring board and the sensor element. The plurality of electricity conducting members fixedly suspend the sensor element within the opening. At least one of the electricity conducting members is a particular electricity conducting member having a plate-like shape, and the particular electricity conducting member includes at least one bent portion between the second end portion joined to the sensor element and the first end portion joined to the wiring board, the bent portion being bent in a thickness direction of the particular electricity conducting member.

Abstract: A gas detection apparatus for detecting the concentration of a first gas component contained in a gas under measurement includes a gas conversion section for convening the first gas component to a second gas component, a gas detection section whose electrical characteristics change with a change in the concentration of the second gas component when the gas detection section is in an activated state, and a detection state setting section. During a detection period, the detection state setting section sets the state of gas detection by the gas detection section to a detection executed state in which the gas detection section can detect the second gas component. During periods which are not the detection period, the detection state setting section sets the state of gas detection by the gas detection section to a detection suspended state in which the gas detection section does not detect the second gas component.

Abstract: A glow plug including a metal sheath tube having a closed front end; a heating element accommodated within the sheath tube; insulating powder filling the interior of the sheath tube so as to surround the heating element; a rod-shaped metal lead connected to the heating element and inserted into the sheath tube from the rear end thereof; and a seal member located in a seal portion at the rear end of the sheath tube to hermetically seal the gap between the sheath tube and the lead. The glow plug is characterized in that the sheath tube is formed to have a substantially uniform outer diameter over an axial range including and extending beyond a range where the seal portion is formed, and the sheath tube has an engagement projection formed at the seal portion and deformed so as to protrude radially inwardly.

Abstract: A glow plug including a metal sheath tube having a closed front end; a heating element accommodated within the sheath tube; insulating powder filling the interior of the sheath tube so as to surround the heating element; a rod-shaped metal lead connected to the heating element and inserted into the sheath tube from the rear end thereof; and a seal member located in a seal portion at the rear end of the sheath tube to hermetically seal the gap between the sheath tube and the lead. The glow plug is characterized in that the sheath tube is formed to have a substantially uniform outer diameter over an axial range including and extending beyond a range where the seal portion is formed, and the sheath tube has an engagement projection formed at the seal portion and deformed so as to protrude radially inwardly.