The LS series of dry screw pumps is a more compact and lower-cost replacement to multi-stage dry Roots pumps for a wide range of vacuum applications. With four pumping speeds from 120 to 1,000 m3/h, the LS series provides high pumping speed and low power consumption. The pump features a pair of conical-shaped, variable-pitch, deeply machined steel screws that allow the pump to be 1/3 shorter in length and 1/3 lighter in weight than other screw pumps in the same pumping speed class. This design also increases the pumping speed near atmospheric pressure, allowing the LS pump to deliver a 20% faster pump-down time while using less power. A built-in silencer reduces the noise level to no more than 61 dB(a).