| 摘要 |
<p>A gauge for monitoring the relative height of two points (7, 9) comprises a generally tubular conduit (6) extending from a first end thereof (7) via a first limb thereof to a monitoring position (9) spaced from the first end (7) and via a second limb of the conduit (6) from the monitoring position to a second end of the conduit in the region of its first end, two immiscible fluids of different densities, each in one of the first and second limbs with a mutual interface within the region of the monitoring position, means (2, 4) to vary the relative vertical positions of the monitoring position on the one hand and the first and second conduit ends on the other, and a pressure comparator (10) to compare the pressures of the fluids at the conduit ends.</p> |
