| 摘要 |
1. Automatic installation for liquid chromatography, comprising at least a chromatography column, a container of product to be fractionated, and at least a container of eluant, said containers being adapted to communicate with the top of the column via an injection pump, automatically controlled supply valves mounted between the injection pump and respectively, each of the containers of product to be fractionated and of eluant, a detecting device connected with the outlet of the column and supplying at least a measuring signal representative of a characteristic of the liquid flowing out of the column, a device for collecting the fractions with at least a collecting container adapted to communicate with the bottom part of the column, and a control unit receiving the measuring signal and comprising means for controlling the fractions-collecting device, characterized in that : a level detector (S10 to S16) is associated with each of the containers of product to be fractionated (10) and of eluant (11 to 16), and supplies a low level signal (SB0 to SB6) when the level of the liquid contained in the container is below a predetermined threshold, at least an automatically controlled outlet valve (V20 to V26) is mounted between the column (18) and the collecting container or containers (20 to 26), a dosing device (10') is associated with the container (10) of product to be fractionated to allow every time the injection into the column (18) of one predetermined dose of the product, and the control unit (30) comprises : a control device (32) receiving the or each measuring signal (SUV, SpH, SCO) issued by the detecting device (19a, 19b, 19c) and controlling the supply and outlet valves (V10 to V16 and V20 to V26) and the dosing device to perform successive chromatography cycles, each comprising at least the sequential operations of injecting into, the column a predetermined dose of product to be fractionated, of admitting eluant and of collecting a fraction ; and a safety device (31) connected to the level detectors (S10 to S16) to control the stoppage of the pump and to prevent the admission of the product to be fractionated or eluant into the column when the corresponding level detector issues a low level signal. |
