The nitrogen blower series is a multi-channel sample concentration device that combines a PID temperature-controlled metal bath and a nitrogen purge device. Its working principle is to blow nitrogen to the surface of the heated sample quickly, continuously and controllably. According to the concentration of the sample to be concentrated, Solvent evaporation rate and boiling point, set heating temperature, achieve rapid concentration of batch samples. This instrument uses an aluminum heating module, which has good heat conductivity and uniform heat transfer, which is conducive to rapid heating and rapid temperature control. Nitrogen is blown onto the sample surface to achieve an oxygen-free concentration of the liquid sample.