Four-stage diaphragm pumps are an excellent solution for continuous, oil-free pumping of gases when the need is to reach fractional millibar ultimate vacuums. All parts in contact with pumped vapors or gases are made of aluminum, stainless steel and carefully selected plastics suitable for a wide range of non-corrosive applications. These pumps provide the advantageous combination of high pumping speed with an extraordinary good ultimate vacuum down to 0.5 mbar. The highly flexible, fabric-reinforced double diaphragms made of FKM offer extended operating life. Eight-cylinder NT pumps features quiet operation, smooth and easy to clean surfaces. Four-stage diaphragm pumps are an excellent choice for continuous, contamination-free evacuation and pumping of non-aggressive gases under the very high vacuum demands of applications in physics and analytics. They generate a clean vacuum, as they are designed without any contact seals, hence no abrasion or dust is produced that might creep back into the application. Due to the outstanding ultimate vacuum, these pumps are often used as alternative to rotary vane pumps. A typical application is the use as backing pump for turbomolecular drag pumps. Additionally, the VARIO^® design provides vacuum control by precise adjustment of the diaphragm pump´s motor speed. Depending on the application, the demand-responsive motor speed control results in unsurpassed lifetimes of service parts such as diaphragms, as well as optimal performance for backing of turbo pumps.

• contamination-free pumping and evacuation
• high performance even close to the excellent ultimate vacuum
• whisper quiet
• very low vibration
• exceptionally long diaphragm life and maintenance-free drive system for low lifetime costs