Galvanic cell type oxygen sensor and method of injecting electrolyte into galvanic cell type oxygen sensor

摘要

PROBLEM TO BE SOLVED: To provide a galvanic cell oxygen sensor that is less susceptible to electrolyte leakage during manufacture, and a method of injecting electrolyte into such a galvanic cell oxygen sensor.SOLUTION: A galvanic cell oxygen sensor X comprises, in a casing 1, a positive electrode 2 containing a precious metal, a negative electrode 3, an electrolyte 4 in contact with the positive electrode 2 and the negative electrode 3, an electrolyte accommodating section 5 for accommodating the electrolyte 4, and a gas permeable diaphragm 6 that allows a detection target gas to pass therethrough. The casing 1 comprises a casing body 1a and a lid portion 1b that comprises a frame portion 1b1 to be welded to a peripheral portion of the casing body 1a and a resin portion 1b2 made of resin and located on the inner side of the frame portion 1b1, where the resin portion 1b2 is provided with an injection port that enables injection of the electrolyte 4.SELECTED DRAWING: Figure 1