| 摘要 |
<p>A fluid density measurement device (10) comprises a float/weight assembly (20) with a float (22) and weight (24) pivotable about an axis (26). The float/weight assembly adopts an orientation about the horizontal axis which is dependent upon the density of the fluid in which the device is immersed. A reference wheel (74) is rotatably mounted freely and is eccentrically weighted so as always to adopt a defined orientation relative to the vertical direction. A follower wheel (72) is magnetically linked by magnets (70, 76) so as to follow the rotation of the float/weight assembly. A detector (80) detects the relative positions of the two wheels, thus sensing the orientation of the float/weight assembly regardless of the rotary position of the device as a whole. The two wheels are housed in a pressure-resistant compartment (60). As an alternative to the magnetic coupling and the detector wheels, the float/weight assembly may alter the position of a magnetic core so as to vary the transmission characteristic between two coils. The coils can be coupled to the detector in the pressure-resistant compartment by inductive windings.</p> |
