Arrangement for monitoring the leak-tightness of an...

Details Arrangement for monitoring the leak-tightness of an... Arrangement for monitoring the leak-tightness of an...

G - Physics

01

M

G01M 3/36 (2006.01)

Patent

CA 2619427

An arrangement for monitoring the leak-tightness of an evacuated space which is hermitically closed, leak--tight, by means of at least one metallic wall is specified. A device which is connected to the evacuated space indicates an inadmissible pressure rise in the evacuated space caused by a leak in the wall. The device consists of a metallic concertina, which is hermetically connected, leak-tight, to the evacuated space, and of an electrical proximity switch to which an evaluation unit is connected. The proximity switch (7) is mounted, in the direction of movement of the concertina (5), at a distance from the end face of the latter, the size of which is varied as a function of the respective axial length of the concertina (5) . A tube (9) connected fixedly to the wall (2) is mounted around the concertina (5), so as to maintain an air gap, surrounds the concertina (5) in a moisture-tight manner and is longer than the concertina (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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