| abstract |
A gas sensor capable of accurately detecting the concentration of a specific gas in a detection gas without being affected by the concentration of the oxygen gas in the detection gas. A gas sensor includes a solid electrolyte body, a sensor element having a pair of electrodes, and a heater. The solid electrolyte body 21 is composed of an oriented apatite solid electrolyte. The control temperature of the heater 3 is set so that the temperature of the detection electrode 22 exposed to the detection gas g of the pair of electrodes 22 and 23 is 300 to 550 ° C. The gas sensor 1 is configured to detect the concentration of a specific gas containing oxygen atoms, excluding oxygen molecules, contained in the detection gas g based on the electromotive force E, without being affected by the oxygen concentration in the detection gas g. . [Selection] Figure 1 |