| 摘要 |
PURPOSE:To easily and accurately set change-over timing, by driving a flow passage change-over valve in correspondence to a displayed chromatogram through a valve driving circuit by the output of a central processing unit. CONSTITUTION:The solution to be measured in a gauge tube 37 is fed to a first eluate 1a to reach a separation column 5a and the eluate is guided to a first detector 6a where, for example, the conductivity thereof is detected and a chromatogram is displayed. A keyboard 16 is operated while said chromatogram is observed to set a divisional taking time. Definite calculation is performed on the basis of the dead volume of piping or the flow amount of a pump in CPU13 to calculate a divisional taking volume and, when said volume is equal to or less tan the volume of a gauge tube 47, a first flow passage change-over valve 7 is turned ON for a predetermined time by the output of CPU13 and, about the time when the gauge tube 47 is filled with the solution of the part corresponding to an ion seed, a second flow passage change-over valve 4 is turned ON by the output of CPU13 and the solution is fed to a second eluated 1b to reach a second separation column 5b and further reaches a second detector 6b where, for example, the conductivity thereof is detected. |
