A cryopump or a “cryogenic pump” is a vacuum pump that traps gases and vapors by condensing them on a cold surface but are only effective on some gases. The effectiveness depends on the freezing and boiling points of the gas relative to the cryopump’s temperature. They are sometimes used to block particular contaminants, for example in front of a diffusion pump to trap backstreaming oil, or in front of a McLeod gauge to keep out water. In this function, they are called a cryotrap, water pump or cold trap, even though the physical mechanism is the same as for a cryopump.

Cryotrapping can also refer to a somewhat different effect, where molecules will increase their residence time on a cold surface without actually freezing (supercooling). There is a delay between the molecule impinging on the surface and rebounding from it. Kinetic energy will have been lost as the molecules slow down. For example, hydrogen does not condense at 8 kelvins, but it can be cryotrapped. This effectively traps molecules for an extended period and thereby removes them from the vacuum environment just like cryopumping.

Our company takes service as our soul–we will serve products with technology, serve clients with products, and provide our best service to every customer. The after-sales service staff will arrive and deal with problems in 24 hours for domestic clients. In addition, we pay high attention to the feedback of clients and visit clients regularly and resolve them problems of products.