The application provides an inner cover top
atmosphere measuring device, a working method and a full-
hydrogen cover type annealing furnace, and comprises a telescopic supporting rod, an inner cover, an air-lead
pneumatic hose and a
hydrogen analyzer; the telescopic supporting rod is installed in the inner cover; one end of the air-lead
pneumatic hose extends to the inner top of the inner cover along the inner shaft of the telescopic supporting rod; the other end of the air-lead
pneumatic hose extends out of the inner cover and is connected with the
hydrogen analyzer. The device realizes that the detection
atmosphere inlet is inserted into the inner cover top by adopting the air-
lead structure design of the telescopic rod and the air-lead pneumatic hose and the method of setting the suction pump at the end, and skillfully solves the difficulty of leading out the top
atmosphere of the inner cover with high vertical height and difficult vertical hoisting of the inner cover with temperature.