| 摘要 |
A liquid level sensor system (50) actuated by a column pressure includes a sensor head unit and a hollow member (60) having a distal open end (62) adapted to be positioned into a liquid reservoir (10). A connection tubing system (70) is adapted to provide a closed connection between the hollow member and the sensor head unit which further comprises: a bellows member (120) having an input stem portion (122) adapted for connection to the connection tubing system, an expandable body portion (124) and a distal bellows face surface (126), the bellows body adapted for expansion and contraction in response to differential column pressure changes so that said bellows face surface translates along a range of movement; a non-electrically-powered mechanism (112) responsive to movement of said bellows face surface to provide an indication of the liquid level.
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