Pumping arrangement
AssigneeAgilent Technologies, Inc.
InventorBernd Hoffman
Life of this patent
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Abstract
A pumping arrangement, for example for liquid chromatography, comprises a first liquid reservoir at a first height level, connected via a first hydraulic path to a pumping means; a second liquid reservoir at a second height level, connected via a second hydraulic path to the pumping means; and filtration devices arranged in the first and in the second hydraulic path. Each filtration device comprises an outer member (1) forming a first chamber (6), and an inner member (2) arranged within the outer member and forming a second chamber (5). The inner member (2) is porous and acts as a filter for liquid flowing from the first chamber to the second chamber. The arrangement ensures efficient filtering and prevents undesired backflow of liquid.
Claims11
A pumping arrangement, for example for liquid chromatography, comprising:
- a first liquid reservoir at a first height level (16), connected via a first hydraulic path to a pumping means (10,11);
- a second liquid reservoir at a second height level (17), connected via a second hydraulic path to the pumping means (10,11);
- and
- first and second filtration devices (20,21) arranged in the first and second hydraulic path, respectively, wherein each filtration device comprises an outer member (1) forming a first chamber, and an inner member (2) arranged within the outer member and forming a second chamber, with the inner member being porous for allowing liquid flow from the first chamber to the second chamber.
Pumping arrangement as in any of the preceding claims, wherein the outer member (1) of the filtration device is substantially made of borosilicate glass.
Pumping apparatus as in any of the preceding claims, wherein the inner member (2) of the filtration device is substantially made of sintered borosilicate glass.
Pumping apparatus as in any of the preceding claims, wherein the filtration device (20) comprises an insert (3) made of PTFE which is arranged at the end of the outer member (1) and which contributes to a sealing connection of the filtration device with a connected tube.
Pumping arrangement as in any of the preceding claims, wherein the volume in the hydraulic path (14) between the liquid reservoir and the filtration device (20), and the gas volume which can be accommodated in the filtration device are matched such as to allow optimum liquid priming before the pumping operation of the pumping arrangement starts.
Use of a pumping arrangement as in any of the proceeding claims for preparative liquid chromatography.
Use of a pumping arrangement as in any of the proceeding claims for gradient operation in preparative liquid chromatography.
Dependencies are inferred from the claim text.