The vacuum level of a rotary vacuum pump can vary depending on the specific pump model and its capabilities.
In general, rotary vane pumps are commonly used as pre-vacuum pumps and can achieve rough vacuum levels.
According to the references provided, the vacuum range of a rotary vacuum pump can typically reach up to 10-5 mbar.
These pumps are engineered for demanding industrial processes and are designed to provide optimal vacuum conditions in robust applications.
It is important to note that the vacuum level required for different applications may vary.
For example, benchtop rotary evaporators with volumes up to 5 litres may require a chemistry diaphragm pump with a pumping speed of approximately 1-2 m3/h.
Large-scale rotary evaporators with volumes up to 20 litres may require a pump with a pumping speed of approximately 3-5 m3/h.
When choosing a vacuum pump, one of the main considerations is the desired vacuum level.
Different types of vacuum pumps offer varying vacuum levels.
For example, diaphragm vacuum pumps can offer ultimate vacuums down to 0.3 mbar, while rotary vane vacuum pumps can offer ultimate vacuums down to 2 x 10-3 mbar.
In industrial applications, vacuum pumps can be categorized as ultra-high vacuum (UHV) types.
UHV pumps are characterized by pressures lower than about 100 nanopascal (10−7 pascal, 10−9 mbar, ~10−9 torr).
These pumps are typically two-stage pumps, which means they have two sets of rotors and vanes.
The high vacuum stage takes in process gas and transfers it to a second, low vacuum stage that compresses the gas to atmospheric pressure, improving the vacuum performance of the pump.
In summary, the vacuum level of a rotary vacuum pump can reach up to 10-5 mbar, and the specific vacuum level required for an application will depend on factors such as the volume and the desired pumping speed.
For ultra-high vacuum applications, a two-stage vacuum pump is often preferred.
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