A professional who controls vacuum-drying equipment to convert egg or milk liquids into powder of specified moisture content. Respnsibilities include:

• Couples spray unit between pipeline and drier, using wrench.
• Places charts in temperature and vacuum recorders.
• Starts gas-fired drier, vacuum pump, and circulating fan, and adjusts dampers.
• Turns controls and observes gauges to obtain specified temperature and vacuum pressure in dryer.
• Starts pump and turns valves to spray liquid into heated vacuum chamber where milk droplets are dried into powder.
• Tests dried powder conveyed out of drier, using meter.
• Observes interior of chamber walls for burned scale which indicates excessive temperature.
• Adjusts temperature of dryer and amount of liquid sprayed into dryer to obtain specified moisture content and eliminate scale which appears as sediment in powder.
• Places container on scale under outlet of drying equipment to fill container with specified amount of powder.
• May be designated according to product dried as Buttermilk-Drier Operator; Yolk Spray Drier.