Pfeiffer Vacuum's Roots pumps of the HiLobe series are designed for low and medium vacuum applications.
Pfeiffer Vacuum's Roots pumps of the HiLobe series are designed for low and medium vacuum applications.

Pfeiffer Vacuum has introduced its new Roots vacuum pumps in the HiLobe series, designed for low and medium vacuum applications.

The compact pumps can be used for industrial vacuum applications such as electron beam welding, vacuum furnaces or freeze drying.  They are suitable for fast evacuations such as load-lock chambers or leak detection systems and for use in coating applications.

The new Roots pumps offer a wide nominal pumping speed range of 520 - 2,100 m3/h, which is possible due to the new drive concept in conjunction with frequency converters. The HiLobe has a drive with energy efficiency class IE4 and special rotor geometries which, the company says, lowers maintenance and energy costs by 50% compared with conventional Roots pumps.

The pumps are hermetically sealed to the atmosphere and have a maximum integral leakage rate of 1·10-6 Pa m3/s. Dynamic seals are eliminated as a new sealing concept in the suction chamber means that sealing gas is not needed in most applications. Operation of the HiLobe Roots pumps is possible even at ambient temperatures of more than 40°C with flexible air cooling, so water cooling is also unnecessary.