A personal annunciation device providing, in an area of interest, compensatory annunciation of the presence of an abnormal condition in a hazardous area and accountability of the user of the PAD. A coating is disposed on the inner surface of the seal ring, and oil extends in the space between the coating and the inner surface of the seal ring. Welding is performed on the assembled body 10 covered with a heat insulating jacket 30, the jacket 30 covering the assembled body 10 except an open region and an inflow port 14IN required for welding.