Suitable for sampling of liquid medium, heating/cooling type, the medium is first purged through the coupling valve, and then the temperature is controlled to a proper range by the heating/cooling jacket, and then the inert gas purges the medium in the sample chamber to In the sampling bottle, the coupling valve has the function of quantifying and controlling multiple valves at the same time, which makes the sampling process more accurate and safer for the operator, and the process pressure is separated from the sampling pressure, and the system can be used for higher pressure sampling conditions