FRACTION COLLECTOR

PURPOSE:To improve collection accuracy by setting upper and lower limits of optional two points having a different height of the peak of a chromatography and dividing and collecting the effluent between the upper and lower limits at the optional division. CONSTITUTION:A filler is filled into a column 1, as well as the organic substance of the sample is injected, an eluted solvent is drawn up by a pump 2, passed through the column 1 and sent to a detecting device 4. When the sample flows in the detecting device 4, the peak starts to rise, when a peak height V comes to a set upper limit value VH, a three-way rotary valve 6 is rotated, the effluent of the column 1 flows in a test tube of a fraction collector 7, and fraction number No.1-No.3 are collected. Next, the peak height V descends up to a lower limit setting value VL in the No.4 fraction, the valve 6 is rotated, the effluent of the column 1 flows at the drain side and collected up to all fraction numbers. Thus, the unnecessary solution is not collected and the necessary solution is correctly collected and therefore, the collecting accuracy can be improved.