In addition, positive displacement and momentum transfer pumps maintain a constant pumping speed. However, as the chamber's pressure drops, and the volume contains less and less mass, the throughput and mass flow rate drop exponentially although the pumping speed remains constant. Meanwhile, the leakage, evaporation, sublimation and backstreaming rates continue to produce a constant throughput into the system.
What is the Lifespan Cost of a Vacuum Pump?
The most expensive component in the lifespan cost of a vacuum pump is its energy consumption. In fact, a vacuum pump’s energy consumption typically costs five times more than its purchase price over the pump’s lifespan while maintenance costs are about 30%.
- Initial Purchase Price: 10%
- Maintenance Cost: 30%
- Energy consumption to power the vacuum pump: 50%
- Additional expenses: 10%
The key is to choose the most energy efficient and reliable system, which will allow you to reduce the total cost of ownership dramatically.
What is the Vacuum Level of Industrial Vacuum Pumps?
When choosing a vacuum pump, a deciding factor is the quality and desired vacuum level of the pump. There are three types of vacuum:
- rough or low vacuum;
- high vacuum;
- and ultrahigh vacuum.
The differentiating factor is the scarcity of the number of molecules obtained, which is measured by the pressure exerted by residual gases. The lower the pressure, the more the number of molecules per cm³, and as a result, the vacuum level quality is higher.
Industrial vacuum pumps are categorized as ultra-high vacuum (UHV) types. An UHV type is characterised by pressures lower than about 100 nanopascal (10−7 pascal, 10−9 mbar, ~10−9 torr). These are typically two stage vacuum pumps.