Capillary flow control system for fluid indicator
AssigneePreciflex SA
InventorLucien Vouillamoz
Life of this patent
Estimating the term…
Abstract
A capillary system for a fluid indicator includes a fluid restrictor, and a capillary tube. The fluid restrictor has a small aperture formed therethrough. The capillary tube is adapted to receive a fluid. The fluid restrictor is sealingly affixed into at least one end of the capillary tube so that the small aperture communicates between the inside of the capillary tube and the outside of the capillary tube. The capillary tube is optionally treated so that an inner surface is oilophobic and hydrophobic. The system better controls the interface or meniscus 14 between the fluids contained in the capillary tube, preventing mixing.
Claims18
A capillary system for a fluid indicator includes:
- a) at least one fluid restrictor having a small aperture having a characteristic internal aperture formed completely through the restrictor, the restrictor connecting two fluid regions having an internal aperture width much larger to a certain ratio than the characteristic width of the characteristic internal aperture of the fluid restrictor;
- and
- b) a capillary tube being at least one of the two fluid regions, the capillary tube adapted to receive at least two immiscible fluids, and into at least one end of which the fluid restrictor is sealingly affixed so that the small aperture communicates between the capillary tube and the other of the two fluid regions, wherein further, the small aperture of the fluid restrictor has a width of between 0.03 and 0.1 mm.
Dependencies are inferred from the claim text.