Manufacturing and process plants use compressed air as a power supply for many devices within the plant. Instrument air is used to power instruments, such as controllers, positioners, switching valves, panel loaders and volume boosters. Instrument air can come from the plant air line or they may be separate air lines throughout the plant. In either case, the air supplied to the instruments must be cleaned and dried before it enters the instruments. Emerson Fisher airsets on instrument supply systems increase energy efficiency by avoiding loss of air and ensure adequate and clean air supply to digital components.