A low-temperature cold trap is a device that captures (condenses or adsorbs) gas molecules by lowering temperature, primarily used to remove specific gaseous components in vacuum systems or gas processing processes.

The working principle of low-temperature cold traps is based on the difference in saturated vapor pressure of different gases at low temperatures. When a mixed gas comes into contact with the surface of a cold trap at a sufficiently low temperature, the gas components with higher boiling points will condense into a liquid or solid and be captured, thereby achieving gas separation and purification. Specifically, when the cold trap temperature drops below the dew point of water vapor or organic solvents, these components will condense within the cold trap, achieving the removal purpose.

A low-temperature cold trap is an efficient and reliable device with wide applications in various fields. During use, attention should be paid to selecting the appropriate refrigerant, regular maintenance, and safety precautions.