Nitrogen blowers are mainly used for the concentration or preparation of large batches of samples. Through microcomputer control technology, high-purity aluminum material is used as heating medium to achieve more accurate temperature control and wide temperature control range. The working principle is that by blowing nitrogen gas into the surface of the heated sample, the solvent in the sample is quickly evaporated and separated, so as to achieve the purpose of anaerobic concentration of the sample and keep the sample more pure. Features 1. The blowing needles are independent of each other to avoid cross contamination. 2. The height of the air cavity can be adjusted, and the standard air needle length is 150mm. 3. The nitrogen blower has 12 airway control switches, which does not waste gas. 4. When concentrating toxic solvents, the entire system can be placed in a fume hood. 5. Built-in over-temperature protection device, automatic fault detection and alarm function. 6. LED display, temperature synchronous display, time decrement display, simple and convenient operation.