Kaeser GBS series rotary screw blowers

Kaeser has announced the GBS series of rotary screw blowers. Available in the 75 to 160 kW power range, the series offers flow rates from 22 to 104 m³/min and differential pressures up to 1100 mbar. Power transmission from the motor to the compressor is via loss-free, maintenance-free gearing, which means the GBS series models offer improved efficiency and have low maintenance requirements.

For fixed-speed operation, Start Control (STC) versions are available. They feature an integrated star-delta starter equipped with a premium contactor, overcurrent relay and phase monitoring. The STC versions additionally feature an energy-saving IE4 Super Premium Efficiency motor.

Sigma Frequency Control (SFC) versions are also available, and feature an integrated frequency converter for dynamic adjustment of the flow rate to demand, with the frequency converter and motor matched to deliver optimised overall efficiency. For power outputs up to 110 kW, synchronous reluctance motors are used.

Kaeser says it guarantees the power consumption per unit of flow rate (specific power consumption in kW per m³/h) in accordance with the narrow tolerances of ISO 1217, Annexe E.