HSD model features two independently operating compressors in single enclosure. Packages are available from 500-650 hp, and deliver flows from 1632-3002 cfm and pressures from 100-217 psig. Individual compressor units each include motor, Sigma Profile airend, separator aftercooler, draintrap and filtration. Provides maximum part-load efficiency, built-in redundancy, and reduced installation costs. Both units have dedicated Sigma Controls connected via Profibus for energy efficient sequencing and fully automatic monitoring of critical operating and maintenance indicators.