| 摘要 |
<p>The probe comprises at least one chamber (221, 222, 223, 224), a piston (P1, P2, P3, P4) mounted slideably in the chamber, this piston defining in the chamber, on the one hand, a reference pressure volume (26, 30, 36, 38) connected to a reference pressure source and, on the other hand, a volume (24, 28, 32, 34) for the entry of the pressure prevailing in the supervised low-pressure box; the piston (P1, P2, P3, P4) mounted slideably in the said chamber (221-224) is ballasted at a value such that it moves from a first equilibrium state to a second equilibrium state when a pressure threshold (S1, S2, S3, S4) is exceeded in the low-pressure box (2), the movement of the piston between the first equilibrium state and the second equilibrium state supplying a piece of data to the supervising system (4) of the low- pressure box (2). <IMAGE></p> |
