| 摘要 |
An apparatus and method of for measuring fluid levels in a fluid tank (30) utilizing a no moving parts fluid level sensor (20). The apparatus comprises a hollow sensing tube (24) sealed to a pressure sensor (22). The pressure sensor (22) measures air column pressure as a function of hydrostatic pressure within the fluid tanks (30). By modifying the design of the hollow sensing tube (24) to incorporate at least 30% of the volume at its bottom end, the accuracy of the fluid level measurements may be increased by decreasing the meniscus level (34) deviation in the hollow sensing tube (24). Further, by adding a flexible diaphragm (62) to the bottom end that does not allow fluid to enter the hollow sensing tube (24), the accuracy of the fluid level measurements may be further increased by eliminating the meniscus level (34) altogether. Also, design modifications may be made to the hollow sensing tube (24) that ensures that the bottom end of the hollow sensing tube (24) is located at the bottom 30A of the fluid tank (30), or that ensures that fluid slosh effect is dampened, or ensures that the hollow sensing tube (24) is located in the center of the fluid tank (30).
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