| CRYOSORPTION PUMP AP25 |
FEATURES
- Large sorption capacity
- Clean rough pumping
- Long lifetime
- Noiseless and vibrationless operation
Cryosorption pumps are suited for rough pumping down to a pressure of 0.1 Pa. They use the large sorption capacity of zeolites known as molecular sieves at liquid nitrogen temperature.The pumping speed of the sorption pump depends on the pumped gas. Oxygen, nitrogen, carbon dioxide, water vapour and light hydrocarbons are pumped well. The pumping speed is lower for hydrogen and very low for inert gases. The highest pumping speed is achieved after the regeneration of the sorption pump and it decreases with the continuous covering of the zeolite surface with adsorbed molecules. If the zeolite surface is saturated, the sorption pump must be regenerated by baking for at least one hour. Larger vacuum vessels can be evacuated by several sorption pumps operated successively. An ultimate pressure lower than 0.1 Pa can be achieved through the successive operation.
The pump body is made from four serial cylindrical segments filled with the molecular sieve - A5. The thermal shielding plate is adapted for hanging a polystyrene dewar with liquid nitrogen during pumping or for hanging a bakeout unit during thermal regeneration. The gas release safety valve is placed under the pump inlet flange CF40.