Device for automatic sampling and measurement of liquid volumes |
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| 申请号 | US3769841D | 申请日 | 1971-11-04 | 公开(公告)号 | US3769841A | 公开(公告)日 | 1973-11-06 |
| 申请人 | AGA AG; | 发明人 | THULIN S; | ||||
| 摘要 | Automatic sampling and measurement device for liquid volumes in which the orifice of a tube is submersible in the liquid to be sampled, there being above the liquid surface an appropriate overpressure in relation to the pressure at the other end of the tube, there being further placed a detector at a defined level of the tube, the volume in the tube between its orifice submersible in the liquid and said level corresponding to the liquid volume to be sampled, the detector being caused to activate a device which raises the tube orifice out of the liquid, when the interface between liquid and gas in the tube reaches said level, after which the overpressure forces the so measured liquid volume out through the other end of the tube. | ||||||
| 权利要求 | 1. A device for automatic sampling and measurement of liquid volumes, comprising a tube-like member having an orifice at one end submersible in the liquid from which a volume is to be sampled and measured, the orientation of the tube and the relative pressures at said orifice end and the other end of the tube-like member being such that liquid will flow through the tube-like member when its orifice end is submerged in the liquid, means located along the tube-like member for detecting the arrival at a predetermined point of a liquid gas interface moving therethrough, and a means responsive to said detection for effecting relative movement between said orifice end and the liquid surface to relatively move said orifice end out of the liquid, whereupon the volume of liquid in the tube-like member is forced out through the other end as a measured sample corresponding to the volume of the tube-like member between said orifice end and said predetermined point. 2. A device as claimed in claim 1 wherein said detector is movable along the tube-like member for setting of the desired liquid volume to be measured. 3. A device as claimed in claim 1 wherein said tube-like member comprises a capillary tube. 4. A device as claimed in claim 1 further comprising means defining an enlarged volume connEcted in said tube-like member between said orifice end and said other end. 5. A device as claimed in claim 1 wherein there is a gas above the liquid surface at an elevated pressure relative to the pressure at said other end of said tube-like member. 6. A device as claimed in claim 1 wherein said orifice end is vertically movable, and wherein said tube-like member includes a flexible section to permit said vertical movement. 7. A device as claimed in claim 1 wherein said liquid is contained in a flexible-walled container, and said tube-like member passes through said wall and is mounted such that the movement of said orifice end into and out of said liquid is accommodated by flexure of said flexible wall. 8. A device as claimed in claim 1 wherein said liquid is contained in a container having an opening through a surface thereof, and said tube-like member is slidably and sealably disposed in said opening for vertical movement of said orifice end above and below the liquid surface. 9. A device as claimed in claim 1 wherein said liquid is contained within a container, and further comprising means for maintaining the liquid level therein at a predetermined level. 10. A device as claimed in claim 1 wherein said other end of said tube-like member is disposed below said orifice end. |
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