Connecting device for pneumatic and/or hydraulic circuits in column chromatography
AssigneeCarlo Erba Strumentazione S.p.A.
InventorsWerner Dosch, Heinz Wagner
Life of this patent
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Abstract
The invention relates to a connecting device for fluid circuits in column chromatography. To ensure an inert connection without dead volumes, the device comprises a glass or fused silica thick-wall body with an inner capillary channel connected to the outside through radial holes. In such holes, metal or fused silica capillaries are inserted and each fixed by means of a coupling carrying a capillary set screw and a coupling fixing screw, with said screws acting on opposite positions of said body wall.
Claims15
A connecting device for use in pneumatic and/or hydraulic circuits, to be used in separation techniques, as in capillary column chromatography, for systems of partition and commutation of a fluid flow carrying a sample to be analyzed, in which chemically inert gaskets and fittings are used, comprising:
- a pneumatic or hydraulic distribution panel (S1) which comprises at least a mechanically stable, thick wall glass or fused silica body (K1, K2, K3), having a capillary channel (1) therein, and further having a series of side fittings in the form of transverse holes (2), to define a multiple T-fitting, said transverse holes (2) housing capillary tubes (Q) adapted for conveying gas or liquid, and said capillary tubes (Q) being constructed such that their ends are easily removable, pneumatically sealed and substantially free from dead volumes;
- said holes (2) having an inlet in the thick-wall body (K1, K2, K3) which is flattened to provide a bearing surface (3) for a gasket, and said thick-wall body (K1, K2, K3) carrying holding couplings (F), each of which can be fixed in correspondence with a hole (2), and each coupling (F) having a set screw (E) adapted for sealingly securing the end of a tube (Q) inserted in a transverse hole (2) through a gasket (L) pressing on said bearing surface (3).
Dependencies are inferred from the claim text.