| 摘要 |
An arrangement for monitoring the leak-tightness of an evacuated space which is hermetically closed tight. A device connected to the evacuated space indicates an inadmissible pressure rise in the space caused by a leak in the wall. The device consists of a metallic bellows, which is hermetically connected to the evacuated space, and of an electrical proximity switch connected to an evaluation unit. The proximity switch (7) is mounted, in the direction of movement of the bellows (5), spaced from the end face of the latter, the size of which is varied as a function of the axial length of the bellows (5). A tube (9) connected to the wall (2) is mounted around the bellows (5), so as to maintain an air gap, surrounds the bellows (5) in a moisture-tight manner and is longer than the bellows (5) in its longest initial position corresponding to the expanded state. The proximity switch (7) projects into the tube (9) so as to be sealed off with respect to the latter.
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