PURPOSE: To prevent the holding time for a sample component from being varied by the variation of the environmental temperature and the temperature of a chamber by using a fluid pump which keeps the mass flow-rate always constant for chromatography.
CONSTITUTION: The captioned pump is constituted by allowing an inflow passage 3 and an effluence passage 4 to communicate to a chamber 2 and moving a piston 8 in reciprocation. A temperature sensor 11 for detecting the temperature of the inflow fluid or the chamber 2, flow-rate setting device 12, and a motor revolution speed controller 13 are provided, and the number of revolution of a pump driving motor 10 is kept at the set value of the flow-rate setting device 12 by the motor revolution speed controller 13 according to the signal supplied from the temperature sensor 11. With such constitution, the holding time for each sample component can be kept constant.
KONISHI HIDEKI
WAKABAYASHI KATSUJI
| JP52127848B | ||||
| JPS5855856A | 1983-04-02 |